It is a true statement that the radiative zone of the sun is just outside the core which has temperatures of about 7 million degrees Celsius.
What is the radioactive zone of the sun?We know that the sun is a sort of massive ball of fire in the universe. The sun is always producing heat and the heat that is obtained from the sun is felt al over the earth. Having said that, we now need to examine the way and manner that the sun is able to produce the heat and the light that we receive.
We know that the reaction takes place in the sun is a nuclear reaction and the reaction has to do with the combination of the two nuclei of hydrogen so as to produce a helium ucleus and this is a nuclear fusion which does produce a lot of heat and light. The reaction occur just outside the core of the sun.
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what is the kinetic energy of a 60.0 g tennis ball traveling at 177.0 kilometers per hour? report your answer in joules (j).
The kinetic energy is 939.87 J.
what is kinetic energy?Kinetic energy is the power that an object has as a result of motion. If we want to accelerate an object, we have to exert force. Applying force requires effort on our part. The object will be moving at a new, constant speed once the work is done because energy has been transferred to it.
A particle, an object, or a collection of particles can move because of kinetic energy, which is the force that drives motion. Kinetic energy is used by objects in motion like a person walking, a baseball being thrown, food falling from a table, and charged particles in an electric field.
Kinetic energy = 1/2mv²
Kinetic energy = 1/2×0.06×177²
Kinetic energy = 939.87 J.
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Study the following systems: SYSTEM A: Electricity is used to heat a hot plate which heats water making steam which powers a turbine and a generator which makes electricity which is used to power a radio. SYSTEM B: Electricity is used to power a radio. Which system (A or B) is more energy efficient and explain why.
The system that is more energy efficient is system A because it makes use of electricity to produce more results.
What is energy efficiency?Energy efficiency is the use of less energy to perform the same task or produce the same result.
Energy-efficient homes and buildings use less energy to heat, cool, and run appliances and electronics, and energy-efficient manufacturing facilities use less energy to produce goods.
Energy efficiency has the following benefits:
It saves moneyIt increases the resilience and reliability of the electric gridIt provides environmental, community, and health benefitsAccording to this question, the following applies:
SYSTEM A: Electricity is used to heat a hot plate which heats water making steam which powers a turbine and a generator which makes electricity which is used to power a radioSYSTEM B: Electricity is used to power a radioBased on the above explanation, it can be observed that system A is more energy efficient because it uses the same electricity to achieve more.
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Hooke's law states that the restoring force of a spring is directly proportional to a small displacement. Students in physics class were conducting an experiment to determine the difference in displacement among various springs. They wanted to determine if displacement not only varied with mass but also with the type of spring used. The class tested twenty springs; they varied in length, circumference, and material. They used an assortment of masses as well. On some springs they used masses of 5g increments; on others, masses of 10g increments. After hanging the masses from each spring, they measured how far the springs stretched. The students concluded that thin, aluminum springs had greater displacement than short, thick, iron springs. How could the students improve the validity of the data in this experiment to better support their conclusion?.
The kind of spring should be held constant so as to improve the validity of the experiment.
What is Hooke's law?Hooke's law states that the force that acts on a spring is directly proportional to the extension of the spring as long as the elastic limit is not exceeded.
As such, we can now understand that we can only be able to talk about the Hooke's law if there is no way in which the material has passed the elastic limit of the material. In this case, we are told that the students just embarked on a kind of experiment and they want to be able to verify the validity of the Hooke's law.
We saw that the masses that were hanged were increased but the springs were also changed. This would not allow us to determine the force constant and the Hooke's law accurately.
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the moment of inertia of an object of mass m(a)m(a) is an intrinsic property of the object, (b) depends on the choice of axis of rotation, (c)(c) is proportional to mm regardless of the choice of axis, (d)(d) both (b)(b) and (c)(c) are correct.
Option (B)is correct
depends on the choice of axis of rotation
What does m in a moment of inertia mean?
Formula for Moment of Inertia
Moment of inertia is defined in general form as I = m r2,
where m is the sum of the product of the mass.
r is the separation from the rotational axis.
What elements affect inertia?
The position and orientation of the rotational axis affect a body's moment of inertia. It also depends on the body's size, shape, and how its mass is distributed around a particular axis. Q.
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an airplane flies horizontally at a speed of 351 km/h and drops a crate that falls to the horizontal ground below. neglect air resistance.part (a) if the altitude of the plane was 580 m, then how far, horizontally in meters, did the crate move as it fell to the ground?
Refer to the attached photos. I would appreciate a rate :)
a uniform meter stick of mass 24 g with two weights hanging from it is balanced on a knife edge at the 40 cm mark. a weight of mass 96 g hangs from the 9 cm mark. at which cm mark must the other weight of mass 96 g be located to keep the meter stick balanced?
The second weight of mass 96 g must be located at the 9 cm mark on the meter stick to keep it balanced.
To determine the location of the second weight that will keep the meter stick balanced, we need to consider the principles of equilibrium.
The weight of the meter stick can be calculated as follows:
Weight of meter stick = mass * acceleration due to gravity
= 24 g * 9.8 m/s^2
= 235.2 N
The total weight of the two hanging weights is 96 g + 96 g = 192 g = 1.92 N.
The sum of the forces acting on the meter stick is equal to zero when:
235.2 N + 1.92 N = 0
This equation tells us that the sum of the forces acting on the meter stick is equal to zero when the total weight of the two hanging weights is equal to the weight of the meter stick.
To determine the location of the second weight, we also need to consider the moments about the pivot point. The moment of a force is calculated as the product of the force and the distance from the pivot point. The moments about the pivot point are equal to zero when the sum of the moments of the forces on one side of the pivot point is equal to the sum of the moments of the forces on the other side of the pivot point.
The moment of the weight of the meter stick about the pivot point is calculated as follows:
Moment of the weight of meter stick = force * distance from pivot point
= 235.2 N * 0.4 m
= 94.08 N*m
The moment of the weight hanging from the 9 cm mark about the pivot point is calculated as follows:
Moment of weight hanging from 9 cm mark = force * distance from pivot point
= 1.92 N * 0.09 m
= 0.1728 N*m
To keep the meter stick balanced, the moment of the second weight must be equal in magnitude but opposite in direction to the moment of the weight hanging from the 9 cm mark. The moment of the second weight can be calculated as follows:
Moment of second weight = force * distance from pivot point
= 1.92 N * distance from pivot point
Substituting the value of the force and setting the moment equal to the negative of the moment of the weight hanging from the 9 cm mark, we get the following equation:
1.92 N * distance from pivot point = -0.1728 N*m
Solving for the distance from the pivot point, we find that the second weight must be located at a distance of 0.09 m from the pivot point, or 9 cm. This is the same distance from the pivot point as the weight hanging from the 9 cm mark.
Therefore, the second weight of mass 96 g must be located at the 9 cm mark on the meter stick to keep it balanced.
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Suppose a 15 N force is applied to the side of a 5.0 kg block that is sitting on a table. The block experiences a frictional force against the force that is applied.
a) What is the weight of the block (FG)?
b) What is the normal force on the block (FN)?
c) If the coefficient of kinetic friction is μk = .10, what is the frictional force on the block (Ff)?
d) What is the net force on the block?
e) What is the acceleration of the block from the net force?
Answer:
Explanation:
Fg = W = mg = (5.0 kg)(9.8 m/s²) = 49 N
Fnormal = W = 49 N
Ff = μFn = (0.10)(49 N) = 4.9 N
Fnet = 15 N - 4.9 N = 10.1 N
a = Fnet/m = (10.1N)/(5.0kg) = 2.02 m/s²
What is the ke of an object that has a mass of 2kg and a velocity of 8m/s
The kinetic energy of the object is 64 joule.
What is kinetic energy?According to the definition of kinetic energy in physics, it is the amount of work that an item may accomplish while in motion.
As a scalar quantity, kinetic energy can only be fully defined by its magnitude. SI unit of kinetic energy is Joule.
Given that: mass of the object: m = 2 kg.
Velocity of the object: v = 8 m/s.
Hence, kinetic energy of it =1/2* mass* velocity^2
= 1/2*mv^2
= 1/2 × 2 × 8^2 joule
= 64 joule.
Hence the kinetic energy is 64 joule.
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light travels along the length of a 1500-nm-long nanostructure. when a peak of the wave is at one end of the nanostructure, is there a peak or a valley at the other end if the wavelength is (a) 500 nm and (b) 1000 nm?
If the light travels along the length of a 1500 nm , then
(a) if the wavelength is 500 nm then there will be a peak at other end .
(b) if the wavelength is 1000 nm then there will be a valley .
Wavelength is defined as the distance between two consecutive peaks or valleys .
given the length is = 1500 nm ;
we know that , the formula is L = nλ ;
Part (a) ;
for peak at other end ,
n should be a whole number ;
So , λ = 500 nm
n = 1500/500 = 3 ,
Part(b)
λ = 1000 nm ;
n = 1500/1000
= 1.5
Therefore , (a) There will be a peak at other end .
(b) There will not be a peak at other end .
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a wall of a small house is 3 meters by 3 meters and is insulated using material that is similar to styrofoam (see table above). the styrofoam is about 2.5 cm thick. a heater inside the house keeps the temperature at 25 c while it is 0 c outside the shed. how much power in watts does the heater use just to make up for the heat lost through this one wall.
The heater needs to provide 540 W of power just to make up for the heat lost through this one wall.
What is Styrofoam?Styrofoam is a trademarked brand of foam insulation and craft material manufactured by the Dow Chemical Company. It is made from expanded polystyrene (EPS) beads that are fused together with steam and pressure. EPS is a lightweight and rigid material that is used for insulation, packaging, and soundproofing. Its properties make it an ideal material for crafting, floristry, model building, and other art projects. Styrofoam is stable in most environments and is resistant to water, oil, and most chemicals. It can be cut, shaped, and painted easily and is an excellent thermal insulator. In addition, it is also non-toxic and non-carcinogenic, making it a safe and economical choice for many applications.
Assuming that the wall is a perfect insulator, the heater will have to provide enough power to make up for the heat lost due to conduction and convection. The rate of heat loss per unit area is given by:
Q = λ*A*(T2 - T1)/d
Where:
λ = thermal conductivity of styrofoam (see table above)
A = Area of wall (3*3) = 9 m2
T2 = Temperature inside the house (25C)
T1 = Temperature outside the house (0C)
d = thickness of styrofoam insulation (2.5 cm)
Plugging in the values we get:
Q = 0.045*9*(25-0)/0.025 = 540 W
Therefore, the heater needs to provide 540 W of power just to make up for the heat lost through this one wall.
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a watermelon explodes into three equal masses. one mass moves east at 15.0 m/s. if a second mass moves at a velocity of 10.0 m/s 45.0o s of e, what is the velocity of the third mass? (hint: the total momentum is zero, so how will your vector arrows add up?)
The velocity of third mass of watermelon is 3.12m/sec if it explodes into three equal masses.
We know that we need to conserve the momentum of watermelon in a certain direction.Also,we know that initial momentum of watermelon is zero,it means that according to law of conservation of momentum final momentum should be zero.
Now,initial momentum of watermelon=0Kg-m/sec
Alos,we know that momentum =mass× velocity
Now,suppose watermelon has mass m.When it explodes into three equal parts,then the mass of each watermelon pieces is m/3
=>So,final momentum of piece moving to east=(m/3)×15
Similarly final momentum of second and third piece are
(m/3)×10×1/√2 and (m/3) × v × (1/√2)
So,conserving momentum,we get
=>0=(m/3) × 15 +((m/3)×10×1/√2 ) + (m/3)×10×1/√2 )×v
=> - (15 + 10/√2) = (10/√2)×v
=> - (15√2 + 10) = 10v
=>v = (15√2 + 10)/10
=>v= -(21.21+10)/10
=>v= -31.21/10
=>v= -3.12m/sec
Here negative sign shows that mass will move opposite direction to first piece.
Hence, required velocity is 3.12m/sec.
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which sentence correctly describes when the triple-alpha process occurs in the life cycle of an average-mass star
Three helium-4 nuclei (alpha particles) are turned into carbon by a series of nuclear fusion processes known as the triple-alpha process.
What results from the triple-alpha procedure as the finished product?
The triple-alpha process and the alpha process are two classes of nuclear fusion reactions that stars use to change helium into heavier elements. The alpha process is also referred to as the alpha ladder. [1] Only helium is used in the triple-alpha process, which also yields carbon.
Which statement concerning alpha particles in an atom is accurate?
Two protons and two neutrons make up alpha particles, which are identical to helium nuclei and have a positive charge.
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The new acceleration would be 24.0 m/s/s.
What is acceleration?Acceleration is the rate of change of velocity of an object over time. It is a vector quantity, meaning that it has both magnitude and direction. Acceleration is the result of applying a force to an object, and can be described mathematically as the change in velocity (or speed) divided by the time it takes for the acceleration to occur. Acceleration can also be caused by a change in the direction of motion and is measured in meters per second squared (m/s2). It is an important concept in physics, and is used to describe motion in objects ranging from cars to planets.
The new acceleration would be 24.0 m/s/s. This is because the acceleration of an object is directly proportional to the force applied to it, and inversely proportional to its mass. Therefore, doubling the mass of the object would halve the acceleration, since the force applied to the object remains the same.
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a motorcyclist moves at a constant speed down one hill and up another hill along the smooth curved surface. when the motorcyclist reaches the lowest point of the curve its velocity and acceleration directions are: (a) (b) (c) (d) 5. a car moves along the curved track. what is the apparent weight of the driver when the car reaches the lowest point of
At the lowest point of the curve, the motorcyclist's velocity would be tangential to the curve.
Motorcyclists' velocity would be parallel to the surface of the road. The acceleration of the motorcyclist would be directed opposite the direction of the velocity, meaning it would be directed uphill.
At the lowest point of the curve, the direction of the net force on the driver, Fn, would be directed towards the center of the curve. This is because the velocity of the driver is tangential to the curve, and the centripetal force is directed toward the center of the curve to provide the necessary acceleration to keep the driver on the curve.
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a simple harmonic oscillator takes 11.5 s to undergo five complete vibrations. (a) find the period of its motion. s (b) find the frequency in hertz. hz (c) find the angular frequency in radians per second. rad/s
The required values are a) T = 2.3 seconds, b) f = 0.434 Hz, c) ω = 2.7 rd/s.
Which of the following motions is simply harmonic?Simple harmonic motion, a particular kind of periodic motion in which a particle repeatedly oscillates around a mean location, In U-tube oscillating liquid column motion is hence simple harmonic.
According to question:Given,
Time = 11.5 seconds to five complete vibrations.
a) Time period is time taken to complete one vibration,
So T = 11.5/5 = 2.3 seconds
b) Frequency(f) = 1/T
f = 1/2.3 = 0.434 second inverse.
c) By using formula of angular frequency ω = 2π/T
ω = 2π/2.3 = 2.7 hz
Thus, final values are a) T = 2.3 seconds, b) f = 0.434 second inverse, c) ω = 2.7 rd/s.
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QUESTION 8 OF 30
Using equations for KE and GPE, what is the maximum height an object will
reach if it is thrown vertically upwards at 24.0 m/s ? (Answer to 3 sf with unit)
The maximum height an object will reach if it is thrown vertically upwards at 24.0 m/s will be equal to 29.35 meters.
What is kinetic energy?Kinetic energy is the term used in physics to describe the force that a moving item has.
It is described as the amount of effort necessary to accelerate anybody with a particular mass from rest to a given velocity. Except for variations in speed, the body retains the kinetic energy it gains during acceleration.
As per the given information in the question,
The formula of kinetic energy is,
K.E = 1/2 mv² (i)
The formula of gravitational potential energy is,
u = mg (ii)
Equate equations (i) and (ii)
1/2 mv² = mgh
h = 1/2 v²/g
h = 1/2 (24)²/9.81
= 576/19.62
h = 29.35 meters.
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To determine the acceleration due to gravity, g uing imple pendulum at
different place. ( SOME ONE PLEASE HELP ME ITS MY SCHOOL PROJECT MINIMUM PAGES SHOULD BE 20 )
THANK YOU
M is the mass, and R is the body's radius, hence g=R2GM (planet).The pendulum's time period varying as its acceleration with respect to gravity changes.
How do I determine the acceleration due to gravity using a simple pendulum?Example: On the surface of the earth, a basic pendulum swings for a period of time T 0. This straightforward pendulum would have a period of 12 /xT 0 on a planet with an earth-like density but a radius four times that of the earth.
Answer: T 0 = 2 π√g / L is the formula for a simple pendulum's time period.
The value of g changes in accordance with the mass of a different planet that we visit.
g= GM / R² is the result.
M, which stands for mass, and R, which stands for body radius (planet).
Given, the radius is four times larger for a different planet with the same density.
Given, the radius is four times larger for a different planet with the same density.
M=density, volume, and p = 4/3 πR³
g= G * (p 4/3 πR³ / R² = G * p 4/3 π R
Here, R = 4R
⇒ G×ρ 3 / 4 π(4R)=4g
T 0 represents the new time frame.
T0 = 2π √ L/4g = T0/2
Consequently, 12/ x = 2 /1 x=6 because of =T 0 /2.
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6) Which of the following is NOT true of gravitational force?
A) noncontact
B) depends on mass
C) depends on speed
D) distance
Answer:
D
Explanation:
distance does not factor in when you are calculating the gravitational force of an object
you work at a garden store for the summer. you lift a bag of fertilizer with a force of 131 n, and it moves upward with an acceleration of 0.790 m/s2. (a) what is the mass (in kg) of the fertilizer bag?
Mass of the fertilizer bag is 165.82 kg
Briefing:According to Newton's law,
F = m*a
So, m= F/a
m= 131/0.790
m= 165.82 kg
What is mass?Mass is the measure of matter of a body.
What is Newton's laws?Newton has stated three laws of motion. The first law states that every object will remain at rest or in uniform motion in a straight line unless an external force compels it to change its state of action .
The second law states that the acceleration of an object is dependent upon two variables - the net force acting upon the object and the mass of the object.
The third law states that every action has an equal and opposite reaction.
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A 1.5 kg block is on a 15° frictionless incline plane.
a) What is the normal force?
b) What is the downhill force?
c) What is the acceleration?
Answer:
Below
Explanation:
Normal force will be mg cos 15° = 1.5*9.81 cos 15° Newtons
Downplane force will be mg sin 15° = 1.5 * 9.81 sin 15° N
Acceleration
F = ma
F/m = a
1.5 ( 9.81) sin 15° / 1.5 m/s^2 = a
a type of cuckoo clock keeps time by having a mass bouncing on a spring, usually something cute like a cherub in a chair. what force constant (in n/m) is needed to produce a period of 0.340 s for a 0.0200 kg mass?
According to the information available in the question, the force constant is 6.83N/m.
Using the relation;
T = 2π√m/k
T = period = 0.340 s
m = mass in kilograms = 0.0200 kg
k = spring constant = ?
Making k the subject of the formula;
k = 4π^2m/T^2
k = 4 × (3.142)^2 × 0.0200/(0.340 )^2
k = 4 × (3.142)^2 × 0.0200/(0.340 )^2
k = 6.83 N/m
In physics, force is that power that can change the motion of an item. It also can be described intuitively as a push or a pull. A force has both value and path, making it a vector quantity.
Force is a push or a pull and it affects our daily lives because, without force, people might not be capable of opening and near stuff or lifting up their arms or legs.
Variety of Forces :
* Frictional Forces
* Tension force.
* Spring force.
* Gravitational force.
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The adjacent figure shows a solid 'S' of weight 15N connected to a thread and put on an inclined plane. 1) a-Is the weight of solid 'S' a contact force or a force acting from a distance? b- List the characteristics of the weight of solid 'S'. Thread Inclined plane c- Represent the weight of solid 'S' by a vector. Choose a convenient scale. 2) a- Name the other forces acting on solid 'S' and indicate their types. b- Represent each force by a vector without respecting a scale. c- List the characteristics of each of the above forces. (Without the magnitude) 3) The thread is cut and solid 'S' moves as shown in the adjacent figure a- Name the new force that acts on solid 'S' and indicate its type. b- List the characteristics of this force.(scale 1cm-1.3N). Thread Inclined plane Solid 'S' Solid 'S'
Answer:
Here is answer
Explanation:
a) The weight of the solid 'S' is a contact force because it acts on the solid 'S' through physical contact with the ground.
b) The characteristics of the weight of solid 'S' are:
It acts in the downward direction.
It is a gravitational force that is exerted by the Earth on the solid 'S'.
It is equal to the mass of the solid 'S' multiplied by the acceleration due to gravity (W = m*g).
c) The weight of solid 'S' can be represented by a vector as shown below:
[asy]
unitsize(1cm);
draw((0,0)--(0,15),Arrow(6));
label("$W$", (0,7.5), W);
[/asy]
a) The other forces acting on solid 'S' are the normal force exerted by the inclined plane on the solid 'S' and the frictional force exerted by the inclined plane on the solid 'S'. The normal force is a contact force, while the frictional force is also a contact force.
b) These forces can be represented by vectors as shown below:
[asy]
unitsize(1cm);
draw((0,0)--(0,15),Arrow(6));
label("$W$", (0,7.5), W);
draw((0,0)--(15sqrt(2)/2,15/2),Arrow(6));
label("$N$", (7.5sqrt(2),7.5), NE);
draw((0,0)--(-15sqrt(2)/2,-15/2),Arrow(6));
label("$F_f$", (-7.5sqrt(2),-7.5), SW);
[/asy]
c) The characteristics of these forces are:
The normal force acts perpendicular to the surface of the inclined plane.
The frictional force acts in the opposite direction to the direction of motion or intended motion of the solid 'S'.
The magnitude of the normal force is equal to the weight of the solid 'S', but in the opposite direction.
The magnitude of the frictional force depends on the coefficient of friction between the solid 'S' and the inclined plane, as well as the normal force.
a) The new force acting on solid 'S' is the gravitational force, which is a force acting from a distance.
b) The characteristics of the gravitational force are:
It acts in the downward direction.
It is a force that is exerted by the Earth on the solid 'S'.
Its magnitude can be represented by the vector shown below (using a scale of 1 cm to represent 1.3 N):
[asy]
unitsize(1cm);
draw((0,0)--(0,-1.3),Arrow(6));
label("$W$", (0,-0.65), S);
[/asy]
a vertical spring has a spring constant of 100 n/m. when an object is attached to the bottom of the spring, the spring changes from its unstretched length of 0.50 to a length of 0.65 m. the magnitude of the weight of the object is
Answer: Hookes law states F=kX where F is the force applied, k is the spring constant, and X is the extension of the spring from its resting point.Substituting the values in, we get:F=100*(0.65-0.5)=100*0.15=15N
197) a submarine in neutral buoyancy is 100 m below the surface of the water. what air pressure must 197) be supplied to remove water from the ballast tanks in order for the submarine to surface?
Air pressure must be supplied to remove water from the ballast tanks is 9.8*105 N/m^2.
Buoyancy is the upward force exerted by a liquid that opposes the weight of a partially or fully submerged object. In a liquid column, the pressure increases with depth due to the weight of the liquid above. Therefore, the pressure at the bottom of the liquid column is higher than the pressure at the top of the column. Similarly, the pressure at the bottom of an object immersed in liquid will be greater than at the top of the object. A pressure differential results in a net upward force on an object. The magnitude of the force is proportional to the pressure difference and corresponds to the weight of the liquid (as explained by Archimedes' principle). This is the displaced liquid that would otherwise occupy the underwater volume of the object.
We know that pressure below the surface of water is P1 = Po +hdg
pressure at the surface of water is P2 = Po
Then pressure difference is P = P1 -P2 = hdg
h = depth = 100 m
d = density of water = 1000 kg/m3
g = 9.8 m/s2
Then P = 100*1000*9.8 = 9.8*105 N/m^2
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If you are holding a bucket steady by a rope with a tension force of 20 N, how much does the bucket weigh?
The weight of the bucket suspended by rope held in your hand is 20 N.
What is Newton's third law of motion?
Newton's third law of motion states that for every action there is an equal and opposite reaction. That is the force applied or exerted on an object is equal to the reaction of the object.
Mathematically, the formula for the Newton's third law of motion is given as;
Fa = Fb
where;
Fa is the applied force on the objectFb is the reaction experienced by the objectThe applied force and the reaction force are equal in magnitude but opposite in direction.
Thus, if the tension holding a bucket upward is 20 N, then there must be an equal and opposite force pushing the bucket downwards. The downward force of the bucket or the weight of the bucket must be equal to the tension holding the bucket upwards.
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by studying distant galaxies in the 1920s, hubble made what important discovery that led us to conclude that the universe is expanding?
All galaxies outside the Local Group are moving away from us, and the farther away they are, the faster they're going.
How is Hubble's law defined?We may learn a lot about the nature of the cosmos from Hubble's rule, which states essentially that a known universe velocity (or, as it is commonly displayed, its redshift) is precisely proportionate to its distance. The relationship between distance and speed should not exist if the cosmos is constant and unchanging.
What is the name of Hubble's theory?The Hubble-Lemaître law, commonly referred to as Hubble's law, is the finding in astrophysics that planets are eloping from Earth at rates proportionate to their separation. In other words, they are travelling away from Earth more quickly the more away they are.
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sir lancelot, who weighs 800 n, is assaulting a castle by climbing a uniform ladder that is 5.0 m long and weighs 180 n. the bottom of the ladder rests on a ledge and leans across the moat in equilibrium against a frictionless, vertical castle wall. the ladder makes an angle of 53.1 deg with the horizontal. lancelot pauses one third of the way up the ladder. (a) find the normal force and friction forces on the base of the ladder. (b) find the minimum coefficient of static friction needed to prevent slipping at the base. (c) find the magnitude and direction of the contact force on the base of the ladder. (that is, the vector sum of the forces at the base.)
(a) The normal force is 267.7 N and frictional force is 980 N.
(b) The minimum coefficient of static friction is 0.27, which is needed to prevent slipping at the base.
(c) The direction of the contact force is 1016 N.
∈(t) = 0
N₂ ( L sinθ ) = 800 ( [tex]\frac{L}{3}[/tex] cosθ )
N₂ = 267.7 N
(a) Normal force F(d) = N₂ = 267.7 N
Frictional force N = 800 + 180
N = 980 N
(b) The minimum coefficient of static friction,
F(d) = μ N₁
μ = F / N₁
μ = 267.7 / 980
μ = 0.27
(c) The direction of the contact force,
R = [tex]\sqrt{(980)^{2} + (267.7)^{2} }[/tex]
R = 1016 N
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a current of 11 amps at 240 volts flows through an electric range. if it is user an average of 1 hour/day Calculate the kwhr used per week.
The kWh used per week by the electric range whose voltage and current is 240 V and 11 A respectively is 18.48 kWh.
What is electric kilowatt-hour (kWh)?
A kilowatt-hour is a unit of energy: one kilowatt of power for one hour. In terms of SI derived units with special names, it equals 3.6 megajoules (MJ).
To calculate the kWh per week of the electric range, we use the formula below.
Formula:
E = VIt/1000...............Equation 1Where:
E = Electric energy in kWh per week V = VoltageI = Currentt = Total timeFrom the question,
Given:
V = 240 VI = 11 ampst = 1 hour per day = 1×7 = 7 hours per weekSubstitute these values into equation 1
E = 240×11×7/1000E = 18.48 kWhHence, the kWh used per week is 18.48 kWh.
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how long (in s) does it take a child on a swing to complete one swing if her center of gravity is 5.53 m below the pivot?
4.71 s long (in s) does it take a child on a swing to complete one swing if her center of gravity is 5.53 m below the pivot.
What is the center of the gravity?The average position of an object's weight is known as its center of gravity. Any object's travel through space may be entirely explained in terms of how its gravitational center moves from one location to another and, if it is free to spin, how it rotates around that center of gravity. Calculations combining gravitation and dynamics may be made much simpler by treating an object's mass as though it were concentrated at a single location.
Briefing:T=2π√(l/g)
T=2π√(5.53/9.81)
T=4.71
T =4.71 s
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a system releases heat to the surroundings and no work is done on or by the system. what are the signs of qsystem and wsystem?
Heat that is emitted into the environment is harmful. The system's work output is zero.
The movement of mechanical energy from one item to another is referred to as work. Work is measured in the same units as energy since it is a movement of energy: joules (J). The total energy of an object will change as a force is applied to it across a distance. The object's kinetic energy will vary as a result of either acceleration or deceleration. Its potential energy will change, for instance, if it is raised up to a given height while being pulled by gravity.
Hence, sign are used based on the release and absorbed.
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