The speed of water at the point with a radius of 0.150 m is 16.97 m/s while the radius of the pipe at the point where the water speed is 2.90 m/s is 0.0682 m.
a) To find the speed of the water at a point of a circular pipe where the radius is 0.150 m if the water is flowing into this pipe at a steady rate of 1.20 m³/s, we'll use the equation;
Q = A₁V₁ = A₂V₂ Where Q = Flow rate (m³/s)A₁ = Cross-sectional area at one point (m²)V₁ = Velocity of water at one point (m/s)A₂ = Cross-sectional area at a second point (m²)V₂ = Velocity of water at the second point (m/s)At one point in the pipe, the radius is 0.150 m.Therefore, the cross-sectional area, A₁ is given by:
A₁ = πr₁² = π (0.150 m)² = 0.0707 m²Given that the water is flowing into the pipe at a steady rate of 1.20 m³/s, we can write;Q = A₁V₁1.20 m³/s = 0.0707 m² V₁V₁ = 1.20/0.0707V₁ = 16.97 m/s.Therefore, the speed of water at the point with a radius of 0.150 m is 16.97 m/s.
b) To find the radius of the pipe at a point where the water speed is 2.90 m/s, we'll use the same equation as in part (a);Q = A₁V₁ = A₂V₂At a second point in the pipe, the water speed is 2.90 m/s.Given that the water completely fills the pipe, we know that the volume flow rate, Q will remain constant at 1.20 m³/s.So, we have:
Q = A₁V₁ = A₂V₂We know that A₁ = πr₁²So, Q = πr₁²V₁Also, we know that A₂ = πr₂²So, Q = πr₂²V₂Since the volume flow rate is constant, we can equate both equations,πr₁²V₁ = πr₂²V₂Dividing both sides of the equation by π, we have;r₁²V₁ = r₂²V₂But we are interested in finding the radius of the pipe at the second point, r₂.So, we can express r₁ in terms of r₂ using the relationship between the cross-sectional areas;
A₁ = A₂r₁² = (A₂/A₁)²r₂²r₁ = r₂ (A₂/A₁)^(1/2).We know that A₁ = πr₁²We can find A₂ using the fact that the water completely fills the pipe;
A₁V₁ = A₂V₂πr₁²V₁ = A₂V₂π(0.150 m)²(16.97 m/s) = A₂(2.90 m/s)A₂ = π(0.150 m)²(16.97 m/s)/(2.90 m/s)A₂ = 0.0707 m²
So,r₂ = r₁(A₂/A₁)^(1/2)r₂ = 0.150 m × (0.0707 m²/π)/(0.0150 m²)^(1/2)r₂ = 0.0682 m. Therefore, the radius of the pipe at the point where the water speed is 2.90 m/s is 0.0682 m.
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as a source of blackbody radiation becomes hotter, the peak in its radiation spectrum moves from the visible to the ultraviolet and beyond. does this imply that the object can no longer be seen by the unaided human eye
Yes, it is correct that when the source of blackbody radiation becomes hotter, the peak in its radiation spectrum shifts from the visible to the ultraviolet and beyond. Blackbody radiation is electromagnetic radiation emitted from a blackbody or perfect absorber. This is due to the fact that hotter objects emit shorter wavelengths of electromagnetic radiation, which correspond to higher energy photons. Therefore, when an object gets hot enough to emit mostly ultraviolet or X-ray radiation, it will no longer be visible to the unaided human eye because the human eye can only detect radiation within the visible spectrum of about 400 nm (violet) and 700 nm (red). Therefore, a blackbody that emits radiation beyond this range will no longer be seen by the unaided human eye.
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In the context of research evidence from the study conducted by Williams and McCririe, which of the following operates when a person picks up information critical to catching an object
both central and peripheral vision
In the context of research evidence from the study conducted by Williams and McCririe, both central and peripheral vision operate when a person picks up information critical to catching an object.
What is vision?
Vision is the sense that allows us to recognize and understand the physical world around us. Our brains then receive this information and convert it into the pictures that we see with our eyes.
Vision is the term used to describe the ability to see things with our eyes, such as color, form, and movement.
In the context of research evidence from the study conducted by Williams and McCririe, both central and peripheral vision operate when a person picks up information critical to catching an object.
Their research found that peripheral vision was essential to athletes performing in certain sports such as cricket, soccer, and baseball.
Peripheral vision, as well as central vision, are critical components of efficient eye tracking and hand-eye coordination.
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We always see the same side of the Moon because a. the Moon does not rotate on its axis. b. the Moon rotates on its axis once for each revolution around Earth. c. when t…
We always see the same side of the Moon because
a. the Moon does not rotate on its axis.
b. the Moon rotates on its axis once for each revolution around Earth.
c. when the other side of the Moon is facing Earth, it is unlit.
d. when the other side of the Moon is facing Earth, it is on the opposite side of Earth.
e. none of the above
We always see the same side of the Moon because the "Moon rotates on its axis once for each revolution around Earth." Thus, the correct option will be B.
How does the Moon rotates?When the Moon rotates on its axis once for each revolution around Earth, then we always see the same side of the Moon. The reason behind this is that the moon's rotation takes almost the same time as it takes to orbit the Earth.
When the same side of the moon is facing the Earth, it appears to be unchanging. That is why we always see the same side of the moon from Earth. The other side of the Moon is known as the far side, which was first observed by the Soviet spacecraft Luna 3 in 1959.
Therefore, the correct option will be B.
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Given the definition of EER, find the EER of an 8000 Btu/hour air conditioner that requires a power input of 1500 W. Express your answer numerically in British thermal units per hour per watt. EER = __________(Btu/hour)/W
EER is defined as the Energy Efficiency Ratio which is the ratio of cooling capacity in BTU/hr to the power input in watts.
The EER of the given 8000 Btu/h air conditioner is 5.33 Btu/hour per watt.
In the case of the given 8000 Btu/h air conditioner that requires a power input of 1500 W, the EER can be calculated as follows:
EER = (cooling capacity in Btu/hr) / (power input in watts)
EER = 8000 Btu/hour / 1500 W = 5.33 Btu/hour per wat.
Energy efficiency ratio (EER) is used in the USA and is defined as the system output in Btu/h per watt of electrical energy.
Coefficient of performance (COP) is the equivalent measure using SI units, which is widely used in the UK. A COP of 1.0 equates to an EER of 3.4.
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the surface of the sun appears sharp in visible light because
"The surface of the sun appears sharp in visible light because the photosphere is thin compared to the other layers in the sun."
Most of the electromagnetic energy that reaches the earth begins in the photosphere, the area of the sun that is visible to us. The photosphere is referred to as the sun's surface, despite the fact that it is a gaseous entity.
The gas in the photosphere appears to have a sharp surface, but in reality, it is heavier lower in the Sun and less dense higher up. It is more transparent the less thick it is. The area of the gas that is visible to us is where it has largely become translucent. About 300 km of this layer are deep.
The photosphere is the line separating the core of the Sun from its atmosphere. It is the part of the Sun's surface that is visible to us. The photosphere is not like a planet's surface; even if you could stand in the sun, you couldn't do so on the photosphere.
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Leonardo da Vinci (1452-1519) is credited with being the first to perform quantitative experiments on friction, though his results weren't known until centuries later, due in part to the secret code (mirror writing) he used in his notebooks. Leonardo would place a block of wood on an inclined plane and measure the angle at which the block begins to slide. He reports that the coefficient of static friction was 0. 22 his experiments.
At what angle did Leonardo’s blocks begin to slide?
The angle of repose or the angle of friction is the angle at which the block starts to slide down the inclined plane. By balancing the forces operating on the block along the inclination, it may be calculated.
The gravitational force (mg) acting downhill and the normal force (N) acting perpendicular to the inclination are the forces acting on the block. The gravitational force component perpendicular to the inclination, which is calculated as mg cos, where is the angle of the incline, and the normal force are identical in magnitude.
The block can have a maximum static friction force (Ff) applied to it without it sliding down the incline if:
Ff = μs N
where s is the static friction coefficient.
The amount of the frictional force is equal to the component of the gravitational force parallel to the inclination, which is mg sin, at the instant the block just starts to slide.
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What causes friction?
A. Tiny collisions, called microwelds, on surfaces, even those that seem smooth B. Action - Reaction C. All surfaces are rough to the touch and therefore cause friction D. Inertia
Answer:
b
Explanation: friction is like a force to something to react
(a) When the mass is removed, the length of the cable is found to be l0=4.76m. After the mass is added, the length is measured and found to be l1=5.49m. Determine Young's Modulus Y in N/m2 for the steel cable if the weight has a mass m=35kg and the cable has a radius r=0.015m.
b) If this cable is pulled down a distance d in m from its equilibrium position it acts like a spring when released. Write an expression determining the spring constant k of this material using the cable-specific variables Y,l0,l1, and r.
To find Young's modulus Y, use [tex]Y = mg( l1 - l0 ) / ( πr^2l0 )[/tex] with given values. For the spring constant k, use [tex]k = Yπr^2 / l0, with Y, r,[/tex] and l0 given. (a) Young's modulus Y is a measure .
the stiffness of a material and is calculated using the formula Y = (mg( l1 - l0 )) / ( πr^2l0 ), where g is the acceleration due to gravity. Substituting the given values,[tex]Y = 2.08 × 10^11 N/m^2.[/tex] This means that the steel cable is relatively stiff and can resist deformation under stress. n(b) The spring constant k of the steel cable indicates its stiffness as a spring, with a higher value indicating a stiffer material that will resist deformation more strongly. In this case, the steel cable has a relatively high spring constant of 9.16 × 10^4 N/m, meaning that it will not stretch much when a force is applied.
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in one cycle a heat engine absorbs 480 j from a high-temperature reservoir and expels 320 j to a low-temperature reservoir. if the efficiency of this engine is 56% of the efficiency of a carnot engine, what is the ratio of the low temperature to the high temperature in the carnot engine?
The ratio of the low temperature to high temperature of the Carnot engine is 2.38.
What is the efficiency of Carnot engine?The efficiency of the Carnot engine can be defined as the ratio of network done per cycle by the engine to the heat energy absorbed by the engine per cycle by the working substance from the source.
Efficiency = 1 - (Tlow/Thigh)
Heat absorbed by engine = 480J
Heat expelled by engine = 320J
Efficiency of the engine = 56% of efficiency of Carnot engine
The ratio of low temperature to high temperature in the Carnot engine.
Let's assume the efficiency of the Carnot engine is 'ηc' = 1 - T₂/T₁
Where, T₂ = Low temperature and T₁ = High temperature
To calculate the efficiency of the engine given, η = (Q1 - Q2)/Q1
η = (480 - 320)/480
η = 160/480
η = 1/3
η = 33.33%
Now, η = 56% × ηc
0.56ηc = 1/3ηc = (1/3)/0.56 = 0.58
As we already know, ηc = 1 - T₂/T₁
T₂/T₁ = 1 - ηc
T₂/T₁ = 1 - 0.58
T₂/T₁ = 0.42
T₁/T₂ = 1/0.42
T₁/T₂ = 2.38
Therefore, the ratio of low temperature to high temperature in the given Carnot engine with an efficiency of 56% will be about 2.38.
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Which of the following correctly compares the Sun's energy generation process to the energy generation process in human-built nuclear power plants?
Both processes involve nuclear fusion, but the Sun fuses hydrogen while nuclear power plants fuse uranium.
The Sun generates energy by fusing small nuclei into larger ones, while our power plants generate energy by the fission (splitting) of large nuclei.
The Sun generates energy through nuclear reactions while nuclear power plants generate energy through chemical reactions.
The Sun generates energy through fission while nuclear power plants generate energy through fusion.
The correct comparison of the energy generation processes is "The Sun generates energy by fusing small nuclei into larger ones, while our power plants generate energy by the fission (splitting) of large nuclei". Thus, the correct options are A and B.
What is Nuclear power?Nuclear reactions involve the alteration of an atom's nucleus in both cases. Nuclear power plants and the sun both use energy generated by these nuclear reactions to produce electricity. The difference is in the type of nuclear reaction that takes place.
In the Sun, nuclear fusion is the process by which atomic nuclei of low atomic number fuse to form a heavier nucleus with the release of energy. The energy produced in this way is what makes the Sun so hot and bright. In a nuclear power plant, nuclear fission is the process by which the nucleus of an atom is split into two smaller nuclei.
The energy that is released in the process is used to heat water, creating steam that drives a turbine, which in turn drives a generator to produce electricity.
Therefore, the correct options are A and B.
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A resistor of 4Ω is connected to a series combination of two batteries, 8 V and 4 V. Calculate:
a) The current I.
b) The potential difference Uba
c) The potential difference Uba', when switch S is open.
Answer:
Explanation:
o calculate the current I, we can use Ohm's Law which states that I = V/R, where V is the total voltage across the resistor and R is the resistance of the resistor.
a) The total voltage across the resistor can be found by adding the voltage of the two batteries in series, which gives a total voltage of 8V + 4V = 12V.
So, I = V/R = 12V/4Ω = 3A.
b) The potential difference Uba is simply the voltage difference between the two batteries in the series combination, which is 8V - 4V = 4V.
c) When switch S is open, the circuit is broken and the potential difference Uba' becomes equal to the voltage of the 8V battery. So, Uba' = 8V.
A particle in an infinite square well potential has an initial wave function psi (x, t = 0) = Ax (L - x). Find the time evolution of the state vector. Find the expectation value of the position as a function of time.
The position expectation value as a function of time is constant and is equal to L/3.
Given a particle in an infinite square well potential has an initial wave function Ψ (x, t = 0) = Ax (L - x).The time evolution of the state vector: The time evolution of the state vector is given by Ψ(x,t) = ΣC_nΨ_n (x) e^(-iE_n t/h).The expectation value of the position as a function of time:The expectation value of the position as a function of time is given by the formula given below:x = Σa_n^2x_nΨ_n(x)Ψ_n*(x). Where,
a_n is the coefficient for each energy level.
Energy levels for infinite square well potential is given byE_n = n^2h^2 / 8mL^2Now, let us find the value of coefficient A. We know that a particle in a square well is normalized using the following formula:
∫Ψ^2 dx = 1. 0 to L∫Ax(L-x)^2dx = 1A(L^3)/3 = 1, A = √(3/L^3).
Now, the wavefunction for the particle is given by:
Ψ (x, t = 0)
= Ax (L - x)
= √(3/L^3) x (L - x).
Now, we can express this wave function in terms of the energy eigenfunctions as below:
Ψ (x, t = 0)
= Σ a_nΨ_n (x)
= Σa_n sin((nΠx)/L).
We can calculate the value of coefficient a_n by integrating the product of the initial wavefunction with the energy eigenfunctions, which is given by: a_n = 2/L ∫Ψ(x, t = 0) sin((nΠx)/L) dx.
Now, let us calculate the value of coefficient
a_n.a_n = 2/L ∫Ψ(x, t = 0) sin((nΠx)/L) dxa_n
= 2/L ∫√(3/L^3) x (L - x)sin((nΠx)/L) dxa_n = 2√3/L^2 ∫x(L - x)sin((nΠx)/L) dx.
From the previous results of integration,
a_n = (-1)^n+1 24√3/nΠ^3
a_n = (-1)^n+1 24√3/nΠ^3
Ψ(x,t) = ∑ a_nΨ_n(x) exp(-iE_n t/ℏ). Where E_n = n²h²π² / 2mL².
Substituting the values of a_n in the above formula, Ψ(x,t) = Σ(-1)^n+1 24√3/nΠ^3 sin(nΠx/L) exp(-in²π²h²t/2mL²ℏ²). Expectation value of the position as a function of time: The expectation value of the position is given by the formula, x = Σa_n²x_n. Where x_n is the position of nth energy level.
So, x_n = L/nSo,x = L∑a_n²/n From the previous results of coefficient, Σa_n²/n = 1/3. Now, x = L/3. Hence the position expectation value as a function of time is constant and is equal to L/3.
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A battery-powered toy car pushes a stuffed rabbit across the floor.Part ADraw a free-body diagram for a car (assume that it is moving from left to the right).Draw the force vectors with their tails at the dot. The orientation of your vectors will be graded. The exact length of your vectors will not be graded but the relative length of one to the other will be graded.Part BDraw a free-body diagram for a rabbit.Draw the force vectors with their tails at the dot. The orientation of your vectors will be graded. The exact length of your vectors will not be graded but the relative length of one to the other will be graded.
Part A: Thrust acts on the right in the direction of motion. Gravity acts downward.
Part B: The direction of air resistance is opposite to the direction of motion, which is shown towards the left. Gravity acts downwards.
Part A:
A free-body diagram for a car is as follows:
The direction of friction is opposite to the direction of motion, which is shown towards the left.
The diagram shows three forces acting on the toy car that is battery-powered, which is as follows:
The force due to friction is labeled as [tex]f_K[/tex].
The force of thrust is labeled as [tex]f_T[/tex]. The force of gravity is labeled as [tex]f_g[/tex].
Part B:
A free-body diagram for a rabbit is as follows:
The diagram shows three forces acting on the stuffed rabbit that is being pushed by a toy car that is battery-powered, which is as follows:
The direction of friction is opposite to the direction of motion, which is shown towards the right.
The force due to friction is labeled as [tex]f_K[/tex]. The force due to air resistance is labeled as fair. The force of gravity is labeled as [tex]f_g[/tex].
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the orbital period of saturn is 29.46 years. determine the distance from the sun to the planet in km
The average distance from the Sun to Saturn is approximately 1,427,000,000 km. To calculate this, we can use the Third Kepler's Law of Planetary Motion, which states that the square of the orbital period of a planet is proportional to the cube of the semi-major axis of the orbit.
We can use Kepler's Third Law to relate the orbital period of a planet to its distance from the sun:
T^2 = (4π^2 / GM) * r^3
where T is the orbital period in years, G is the gravitational constant, M is the mass of the sun, and r is the average distance from the sun to the planet in astronomical units (AU).
Therefore, we can use the formula:
d^3 = (T^2 * 4π^2)/G*M
Where d is the distance, T is the orbital period, G is the gravitational constant, and M is the mass of the Sun.
Plugging in the values:
d^3 = (29.46^2 * 16π^2)/(6.67408 * 1.989 * 10^30)
d = 1,427,000,000 km
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I need help with this question
The gardener does 5600 joules of work in pushing the wheelbarrow around the lawn.
Step-by-step calculation:
The distance traveled by the wheelbarrow is the perimeter of the lawn, which is:
Perimeter = 3 m + 4 m + 3 m + 4 m = 14 m
The net force exerted on the wheelbarrow is the sum of the force used to push it along the ground and the force used to lift it off the ground:
Net force = 100 N + 300 N = 400 N
The angle between the force and the direction of motion is 0 degrees, so the cosine of the angle is 1.
The work done by the gardener is given by:
Work = Force x Distance x cos(theta)
Substituting the values we found above, we get:
Work = 400 N x 14 m x cos(0 degrees)
Work = 5600 J
Therefore, the gardener does 5600 joules of work in pushing the wheelbarrow around the lawn.
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Help asaaap it's about doppler effect
The frequency that the bad guy hear is 12000 hz when the police car is moving with speed of 80m/s.
Frequencyfo=fs(vvov), where fo is the observed frequency, fs is the source frequency, v is the speed of sound, vo is the observer's speed, the top sign indicates the observer is approaching the source, and the bottom sign indicates the observer is leaving the source.Equation fo=800(80-65) fo = 12000 after substituting the variablesThe apparent change in frequency of a wave as a result of an observer moving with respect to the wave source is known as the Doppler effect or Doppler shift. It bears the name of the Austrian physicist Christian Doppler, who first described the phenomenon in 1842.For more information on doppler effect kindly visit to
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The half life of a radioactive substance is 5 hours. If 5g of the substance is left after 20 hours, determine the original mass of the substance
Answer:
The original mass of the substance was 10g.
Explanation:
The half-life of a radioactive substance is the amount of time it takes for half of the substance to decay. In this case, the half-life is 5 hours.
We can use the half-life formula to find the original mass of the substance:
N = N0 * (1/2)^(t/T)
where:
---N0 is the initial mass of the substance
---N is the remaining mass of the substance after time t
---T is the half-life of the substance
We know that after 20 hours, only half of the substance remains:
N = N0 * (1/2)^(20/5) = 0.5 * N0
If we solve for N0, we get:
N0 = N / 0.5 = 5g / 0.5 = 10g
Therefore, the original mass of the substance was 10g.
hydroelectric, wind, geothermal, and parabolic solar collection all rely on spinning turbines (connected to a generator) to produce electricity. explain how each provides the force to do so.
Hydroelectric energy is generated by capturing the energy of flowing water. As water flows through a turbine, the blades of the turbine spin and generate electricity.
How does the different energies provide force?Wind energy is generated by capturing the kinetic energy of the wind. As wind passes through the turbine, the blades spin and generate electricity.
Geothermal energy is generated by harnessing the natural heat of the Earth’s core. Heat from the Earth’s core is used to generate steam, which is then used to spin a turbine and generate electricity.
Parabolic solar collection is a method of collecting the sun’s energy using large reflective mirrors. The mirrors focus the sunlight onto a central point, which is then used to spin a turbine and generate electricity.
Thus, all of these power sources rely on spinning turbines connected to a generator to produce electricity.
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Select the correct location on the image.
The image shows the visible light spectrum received from a star. Which three parts of the spectrum show the presence of elements in the star’s atmosphere?
The visible light spectrum is the range of wavelengths the human eye can detect, ranging from 380 to 700 nanometers.
What are visible light examples?People think of the sun, light bulbs, candles, and flames when they think of light, but visible light originates from many sources and in many hues. Other visible light sources include television and computer displays, glow sticks, and pyrotechnics.
This is why this area of the electromagnetic spectrum is known as the visible spectrum or colour spectrum. It primarily comprises of seven colours: violet, blue, green, yellow, orange, and red.
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Answer:
It is the three spots where there are lines. Between 400 and 500(the two lines), between 600 and 700(the two lines), and the one line between 700 and 800.
A student walks 1.0 kilometer due east and 1.0 kilometer due south. Then
she runs 2.0 kilometers due west. The magnitude of the student's
resultant displacement is closestto
A. 3.4 km
B. 1.4 km
C. 4.0 km
D. O km
The resulting displacement will be 3.4 km. The correct option is A.
The displacement is calculated by finding the displacement from east to west, which is 2.0 km, and subtracting the displacement from north to south, which is 1.0 km.
A student walks 1.0 kilometers due east and 1.0 kilometers due south. Then she runs 2.0 kilometers due west. The magnitude of the student's resultant displacement is closest to 3.4 km.
To begin with, we may use the Pythagorean Theorem to determine the resultant displacement's magnitude. The Pythagorean Theorem is a formula that is used to determine the length of a right triangle's sides when one is missing. This theorem is used to calculate the magnitude of the resultant displacement, which is a quantity. It's a good idea to draw a diagram to help you understand the problem.
Here's a rough sketch of the scenario: We will now apply the Pythagorean theorem in this way: The resultant displacement's magnitude is 3.4 kilometers. Thus, the correct option is A.
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(a) Calculate the magnitude of the angular momentum of the earth in a circular orbit around the sun. Is it reasonable to model it as a particle? (b) Calculate the magnitude of the angular momentum of the earth due to its rotation around an axis through the north and south poles, modeling it as a uniform sphere. Please show your work.
(a) Angular momentum of Earth in a circular orbit around the sun is 2.66 × 10^40 kg m^2/s. It can be modeled as a particle. (b) The angular momentum of Earth due to its rotation around an axis through the poles is 7.07 × 10^33 kg m^2/s, modeled as a uniform sphere.
An object's angular momentum, which measures its rotating motion, is essential to many physical processes. The orbit of the Earth around the sun gives rise to the first sort of angular momentum, while the rotation of the Earth about its axis produces the second. The angular momentum of the Earth's orbit around the sun is quite large, at around 2.66 1040 kg m2/s. Given that the size and form of the Earth have little bearing on its orbit, it seems sensible to treat it as a particle for this computation. In comparison, the Earth's rotation about its own axis generates angular momentum that is only about 7.07 1033 kg m2/s in size. This kind of angular momentum is calculated using the uniform sphere's moment of inertia. In several disciplines, including astronomy and geophysics, the Earth's angular momentum is a crucial number.
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why can't we fall safely with the help of parachute towards the moon?
Answer:
The Moon has no atmosphere so there is no drag on the capsule to slow its descent; parachutes will not work. Lunar landing vehicles were equipped with rocket engines that were fired by the pilot to provide lift — thrust in the opposite direction of descent — during the rapid descent to the Moon's surface.
The moon does not harbor any appreciable atmosphere. Therefore no parachute, no matter how large, will operate properly on the moon. Air is required in order to inflate the parachute and slow down the descending object. Remember geologist Harrison Schmidt, the ONLY scientist to visit the moon? He was one of the last two people to ever touch the lunar surface. (Apollo 17). He demonstrated what would happen when two objects of different masses were dropped simultaneously from about five feet above the moon’s surface. He dropped a hammer and a feather. They fell at the same rate and hit the surface at exactly the same instant! There was no atmosphere to cause the feather to flutter. Note: Careful observers may notice that in videos of the the descending Apollo Lunar Lander (“The Eagle has landed”) lunar dust is kicked up by the craft’s engines. The dust moves out in straight lines, not in billowing clouds! PROOF that the film was made in the airless void of the moon and NOT in some clandestine film studio on Earth. No moon landing hoax!
write an expression for the magnitude of the force, f, exerted on the firefighter by the pole. answer in terms of the variables from the problem statement as well as g for the acceleration due to gravity.
The expression for the magnitude of the force exerted on the firefighter by the pole can be expressed as F = mg + ma.
Where m is the mass of the firefighter,
g is the acceleration due to gravity, and
a is the acceleration of the pole
In order to find an expression for the magnitude of the force, F, exerted on the firefighter by the pole, we need to consider the forces acting on the firefighter.
According to Newton's second law of motion, the force acting on an object is equal to its mass multiplied by its acceleration. In this case, the forces acting on the firefighter are the gravitational force, which is pulling the firefighter downwards with a force of mg, and the force exerted on the firefighter by the pole, which is pushing the firefighter upwards with a force of ma. Therefore, the total force acting on the firefighter is given by the sum of these two forces, which is: F = mg + ma
Thus, this expression gives us the magnitude of the force exerted on the firefighter by the pole. Here, m is the mass of the firefighter, g is the acceleration due to gravity, and a is the acceleration of the pole. if the pole is not accelerating (i.e., if a = 0), then the expression reduces to F = mg, which is the gravitational force acting on the firefighter.
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The electric flux through a spherical surface is4.3×104 N⋅m2/C. What is the net charge enclosed by the surface? The net charge enclosed by the surface isμC. The electric flux through a cubical box34 cmon a side is7.5×103 N⋅m2/C. What is the total charge enclosed by the box? The total charge enclosed by the box isμC
For the electric flux through a spherical surface is 4.3 x 10⁴ N⋅m²/C, then the net charge enclosed by the surface is μC, and for the electric flux through a cubical box 34 cm on a side is 7.5 x 10³ N⋅m²/C, the total charge enclosed by the box is μC.
The electric flux through a spherical surface is 4.3 x 10⁴ N⋅m²/C.
The net charge is Electric Flux = Charge / Surface Area,
so the net charge enclosed is 4.3 x 10⁴ / (4πr²) where r is the radius of the sphere.
Therefore, the net charge enclosed by the surface is μC.
The electric flux through a cubical box 34 cm on a side is 7.5 x 10³ N⋅m²/C.
The total charge is Electric Flux = Charge / Surface Area,
so the total charge enclosed is 7.5 x 10³ / (6a²)
where a is the length of one side of the cube.
Therefore, the total charge enclosed by the box is μC.
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When using compass orientation, migrating animals make use of _____.a. memories from previous trips with parentsb. familiar landmarks and olfactory cuesc. the north and south polesd. the sun, stars, and Earth's magnetic field
When using compass orientation, migrating animals make use of the sun, stars, and Earth's magnetic field to navigate. So, option d is correct option.
Compass orientation in migrating animals is the process of using the sun, stars, and Earth's magnetic field to navigate. Migrating animals use a variety of techniques to navigate, depending on their species and environment.
Some animals use the position of the sun, stars, and Earth's magnetic field as their primary means of orientation when migrating. This is known as compass orientation.
Compass orientation is a technique that relies on environmental cues, such as the position of the sun and stars, to determine direction. Some animals can use the Earth's magnetic field to navigate as well. This is known as magnetic orientation.
Magnetic orientation is used by some species of birds and fish, as well as certain insects and reptiles. Other animals use landmarks and olfactory cues to navigate.
These animals rely on visual or chemical markers in the environment to orient themselves. This technique is known as piloting. Piloting is used by animals such as rodents, bats, and some species of birds. Animals that use piloting must be able to remember and recognize the landmarks they use as cues to navigate.
Finally, some animals use memories from previous trips with parents to navigate. This technique is known as true navigation. True navigation requires animals to have a highly developed sense of spatial awareness and memory. True navigation is used by animals such as sea turtles and some species of birds.
All of these techniques require different cognitive abilities and sensory mechanisms, but they allow animals to navigate over long distances to reach their desired destinations.
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a student pulls a 1500 kg suitcase along a flat sidewalk. if the cord on the suitcase breaks when the force is greater than 50n, what is the maximum acceleration that the student can achieve with the suitcase?
The maximum acceleration that the student can achieve with the 1500 kg suitcase is 50N/1500kg = 0.033 m/s2.
Acceleration is the change in velocity per unit time. Acceleration is a vector quantity that has both magnitude and direction. Acceleration is divided into deceleration acceleration and acceleration acceleration. Acceleration decreases meaning the direction of acceleration is opposite to the direction of velocity.
To calculate the maximum acceleration, we can use the following equation:
Force = Mass x Acceleration. Therefore, 50N = 1500kg x Acceleration
Solving for Acceleration, we get 50N/1500kg = 0.033 m/s2.
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what happens after the helium flash in the core of a star?
After the helium flash in a star, the core quickly heats up and expands.
A helium flash is the very brief thermal runaway nuclear fusion of significant amounts of helium into carbon during the red giant phase of low mass stars (between 0.8 solar masses (M) and 2.0 M). The centre expands as a result of the core becoming warmer as a result of this.
Following the onset of helium nuclear reactions in a star's core, helium nuclei fuse to create carbon and oxygen.
Most of the time, the stars' positions in reference to one another remain constant. Convergence between Orion and Taurus is ongoing. Ursa Minor is never far from Draco. The stars appear to us as an endless backdrop painting in the sky that hardly moves in reference to one another.
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why is a polarized filter helpful to a photographer? A. it transmits all light
Answer:
It blocks some light, but not all.
Explanation:
The point of polarization is to get the light to travel in a single plane. The light waves occur in a single plane. The direction of the vibration of the waves is the same. With two polarized filters, it is possible to block out nearly all the light.
Two very long parallel wires are a distance d apart and carry equal currents in opposite directions. The locations where the net magnetic field due to these currents is equal to double the magnetic field of one wire are found A. midway between the wires. B. The net field is not zero any where. C. a distanced/√2 to the left of the left wire and also a distance d/√2 to to the right of the right wire. a distance d /2 to the left of the left wire and also a distance d/2 to the right of the right wire. D. a distance d to the left of the left wire and also a distance d to the right of the right wire.
A distance d/√2 to the left of the left wire and also a distance d/√2 to the right of the right wire. The correct option is C.
How to calculate the distance of the magnetic field?Let's consider a point P at a distance d/√2 to the left of the left wire. At this point, the magnetic field due to the left wire is:
B₁= μ₀I/(2π(d/√2))
Similarly, the magnetic field due to the right wire at point P is:
B₂ = μ₀I/(2π((d/√2)+d))
The net magnetic field at point P is:
Bnet = B₂ - B₁ = μ₀I/(2π((d/√2)+d)) - ₀/(2π(d/√2))
Simplifying this expression, we get:
Bnet = μ₀I/(2πd)
This is equal to the magnetic field due to one wire at a distance d from the wire. Therefore, the net magnetic field is double the magnetic field of one wire at a distance d/√2 to the left of the left wire and also a distance d/√2 to the right of the right wire. Option C is correct.
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what is the minimum angular velocity (in rpm ) for swinging a bucket of water in a vertical circle without spilling any? the distance from the handle to the bottom of the bucket is 35 cm . express your answer in revolutions per minute.
The minimum angular velocity (in rpm) for swinging a bucket of water in a vertical circle without spilling any is 5.56 rpm.
The minimum angular velocity (in rpm) for swinging a bucket of water in a vertical circle without spilling any is given by the formula; Vmin=√g/R
where:
Vmin = minimum angular velocity (in rpm)g = acceleration due to gravity (9.81 m/s²)R = radius of the circular path or distance from the handle to the bottom of the bucket (35 cm)To express the answer in revolutions per minute, the radius of the circle must be converted to meters;R = 35 cm = 0.35 m
Substituting the values given above into the formula;
Vmin=√g/R Vmin=√9.81/0.35 Vmin = 5.56 rpmTherefore, the minimum angular velocity (in rpm) for swinging a bucket of water in a vertical circle without spilling any is 5.56 rpm.
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