Answer:
12 kg·m/s
Explanation:
This is a conservation of momentum problem. Total momentum (p=mv) before the collision must equal total momentum after the collision.
1st object moves in positive direction, 2nd moves in negative direction.
p(before) = (10 kg)(5.4 m/s) - (12 kg)(3.5 m/s) = p (after)
p(after) = 54 kg·m/s - 42 kg·m/s = 12 kg·m/s
hey, remind me about the expansion of spacetime driven by dark energy: what kind of universe do we live in?
We live in universe driven by dark energy consists stars and planets where every object have some mass and contains other properties too.
Dark energy has the cosmoslogists scratching their heads. Perceptions taken by NASA's Hubble Space Telescope and future space telescopes will be required to decide the properties of dull energy, which makes up around 70% of the universe.
Testing dark energy, the energy in void space making the growing universe speed up, calls for precisely estimating how that development rate is expanding with time. Dark energy is remembered to divide space.
Cosmologists accept around 70% of the universe comprises of dull energy, 25% is dim matter, and just four percent typical matter (the stuff that stars, planets and individuals are made of). Hubble perceptions recommend the dim energy might be Einstein's cosmological consistent, an energy permeating out of the vacuum of the space between universes.
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the student wishes to repeat the using different slit separations. what is the smallest slit separation, in micrometers, that produces a first-order maximum?
The spacing is m at its smallest (micron) is the least distance between two slits required to create a second-order maximum for all visible light—that is, a second-order maximum for all visible wavelengths. The spacing is m at its smallest (micron).
How far apart are the slits from one another?In Young's double slit experiment, the slits are separated by 0.1 mm, the light employed is 600 nm in wavelength, and the interference pattern is seen on a screen 1 m from the slits.
Due to its dependence on L, the spacings between various fringes get smaller as the distance between the slits gets more. The distance between various fringes grows as the light's wavelength rises.
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in the absence of an external magnetic field, can we say that one electron con- figuration has a lower energy than the other?
No, we are unable to determine which configuration has lower energy in the absence of a magnetic field.
How does the magnetic field affect energy levels?The atomic energy levels are split into a greater number of levels and the spectral lines are likewise split when magnetic fields are present. The Zeeman Effect is referred to as this splitting. E = 1/2 LI 2 is the equation for the energy held within a magnetic field. The work required to produce a current through an inductor is equal to the energy stored in a magnetic field.
Does the magnetic field contain energy?Energy, also known as magnetic energy, is present in every magnetic field. She is a physics constant. Since an electric current creates a magnetic field, magnetic energy is a kind of moving charge carrier (electrons).
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9) During a game of bowling, which of the following describe the ball's motion?(SELECT ALL ANSWERS THAT APPLY)
A) The ball is accelerated while it is pushed by the student's hand due to an
unbalanced force.
B) The ball slows down as it rolls because friction exerts an unbalanced force.
C) The ball is accelerated while it is held in the student's hand due to balanced
Forces.
D) The ball does not change its motion as it rolls because of the balanced force
provided by friction.
E) The ball does not change its motion while it is held in the student's hand due to
balanced forces.
Answer:
A) The ball is accelerated while it is pushed by the student's hand due to an unbalanced force.
B) The ball slows down as it rolls because friction exerts an unbalanced force.
E) The ball does not change its motion while it is held in the student's hand due to balanced forces.
Explanation:
FILL IN THE BLANKS
12) When two objects interact through the gravitational force between them, the more massive one has a lower ___________ than the less massive object.
13) A student walks 20 m north, 10 m south, and 3 m north. To have a displacement of 0 m,
the student should walk _____m toward the _____.
14) Jennifer's thinking is not supported by Newton's _______ law of motion because during the collision, the force on her bumper car must be _______ in size and _______ in direction to the force on her father's bumper car.
12. When two objects interact through the gravitational force between them, the more massive one has a lower acceleration than the less massive object.
13. A student walks 20 m north, 10 m south, and 3 m north. To have a displacement of 0 m, the student should walk 13m toward the south.
14. Jennifer's thinking is not supported by Newton's third law of motion because during the collision, the force on her bumper car must be equal in size and opposite in direction to the force on her father's bumper car.
a 7.00-kg mass is hung from the bottom end of a vertical spring fastened to an overhead beam. the object is set into vertical oscillations having a period of 2.60 seconds. what is the force constant of the spring?
The force constant of the spring is 42.1 m.
What is force?Force is a physical quantity that is related to the interaction between two objects. It is a vector quantity, meaning it has both magnitude and direction. Force can be thought of as a push or a pull between two objects. When one object exerts force on another object, the second object experiences an equal and opposite reaction force. Some of the most common examples of force include friction, gravity, electric fields, and magnetism. Force is a key concept in physics, as it is often used to explain the motion of objects and the behavior of physical systems.
The force constant, or spring constant, of the spring can be calculated using the equation:
k = (4π^2m)/T^2. In this equation, m is the mass of the object and T is the period of oscillation.
Therefore, the force constant of the spring is
k = (4π^2*7.00kg)/(2.60s)^2 = 42.1 N/m.
This means that if a 1 N force is applied to the spring, it will stretch by 42.1 m.
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which is a major difference between what we've seen in discovered exoplanets and our own solar system?
The major difference between what we've seen in discovered exoplanets and our own solar system is that extrasolar planet orbits tend to be closer and more eccentric than in our Solar System.
Exoplanet:
Any planet outside of our solar system is an exoplanet. The majority of exoplanets orbit other stars, while rogue planets—free-floating exoplanets that are unattached to any star—orbit the galactic center.
All of the planets in our solar system orbit around the Sun. Planets that orbit around other stars are called exoplanets.
Exoplanets are very hard to see directly with telescopes. They are hidden by the bright glare of the stars they orbit.
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a skydiver dives from an airplane. air resistance is measured each second following the skydiver’s jump.
a. the skydriver has the slowest speed 2 seconds
b.the skydriver has the slowest speed 4 seconds
c.the skydriver has the slowest speed 1 seconds
d.the skydriver has the slowest speed 3 seconds
b. The skydriver has the fastest speed at 4 seconds statement best identifies her speed at each second.
The process by which friction slows something moving through air is known as air resistance.
The object's velocity, surface area, and shape all play a role in air resistance. Air density and resistance are affected by temperature, humidity, and altitude.
The greater the resistance, the greater the area and the greater the speed. The frequency at which air molecules come into contact with the object increases with speed. Air resistance increases as a result.
As a result, the sky driver's speed also increases as the air resistance of the 500N driver increases.
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(complete question)
A skydiver dives from an airplane. air resistance is measured each second following the skydiver’s jump.
Time after jump | Weight | Air Resistance
1 sec | 500 N | 200 N
2 sec | 500 N | 300 N
3 sec | 500 N | 400 N
4 sec | 500 N | 500 N
Which statement best identifies her speed at each second?
a. The skydriver has the slowest speed at 2 seconds
b. The skydriver has the fastest speed at 4 seconds
c. The skydriver has the slowest speed at 1 second
d. The skydriver has the fastest speed at # seconds
184) you are standing on a skateboard, initially at rest. a friend throws a very heavy ball toward you. 184) you can either catch the object or deflect the object back toward your friend (such that it moves away from you with the same speed as it was originally thrown). what should you do in order to maximize your speed on the skateboard?
If the friend throws a very heavy ball toward you , then in order to maximize the speed on the skateboard you should Deflect the ball .
The skateboard is given to be at rest ;
the friend throws a heavy ball towards you ,
Initially, the person is given to be at rest ; so his initial speed(u) is 0.
if the person catches the ball then person have same final velocity (v).
By the conservation of momentum ;
[tex]m*u_{b}[/tex] = (M + m)v
v = [tex]m*u_{b}[/tex] /(M + m) ;
Now when the ball is deflected ;
0 + [tex]m*u_{b}[/tex] = m([tex]-u_{b}[/tex]) + MV ;
V = [tex]2mu_{b}[/tex] /M ;
here , V > v ;
Therefore , to maximize speed of skateboard the person needs to deflect the ball .
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photovoltaic cells . select one: a. are increasingly costly produce which precludes major commercial application b. rely on the electrical current produced when silicon is struck by sunlight c. require an outside source of electricity to generate electricity on their own d. have small rotational generators built into every cell
The rotor shaft of a generator is spun or rotated by the fluid's force on the blades.
What do you meant by silicon is struck?When sunlight strikes a solar cell, electrons in the silicon are expelled, causing the silicon to generate "holes"—the voids the departing electrons left behind.
Electrons will be moved to the n-type layer and holes to the p-type layer if this occurs in the electric field. The bonds [between silicon atoms] in a crystal are created by electrons that are shared by all of the atoms in the crystal.
One of the electrons in one of the bonds is stimulated to a higher energy level by the absorption of the light and is thus given more freedom to move than when it was bound. Silicon is the chosen photovoltaic (PV) material because it has a high absorption rate and can generate power from solar energy.
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the leaning tower of pisa is 55 m high and 7.0 m in diameter. the top of the tower is displaced 4.5 m from the vertical. how much more would the top have to be displaced for the tower to be on the verge of tipping? assume the tower is a uniform cylinde
Two parallel circular bases and a curving surface define a cylinder. The height of the cylinder is equal to the angle between the two bases.
What do you meant by uniform cylinde?A cylinder is a three-dimensional solid figure with two identical circular bases connected at a specific distance from the center, which determines the cylinder's height, by a curving surface. Examples of cylinders in real life are toilet paper rolls and beverage cans.
Geometrically speaking, a cylinder is a three-dimensional shape. A cylinder is circular and has a top and bottom with a circled shape. Both the top and bottom are flat and identical in size.
One of the most fundamental curvilinear geometric shapes is the cylinder (from the Greek letter o, romanized as kulindros, meaning "roller" or "tumbler"). It is referred to as a prism with a circle as its base in elementary geometry.
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why the force needed to keep an object traveling in the same size circle is larger the faster the object is going.
A body's direction constantly shifts as it circles around. This shift in direction causes a change in velocity, which causes the motion to accelerate. We know from Newton's First Law that an external force is necessary to produce acceleration. Therefore, a force is required to maintain the body's circular motion.
What force must be applied to maintain an object's motion in a circle?A net force called a centripetal force acts on an object to keep it moving in a circular motion.
According to Newton's first law, unless a force acts on an object, it will either stay in place or continue to move at a constant speed. Inertia is the term for this notion. An object has more inertia the heavier it is (or the more mass it has). Due to their greater inertia, heavy objects are more difficult to move than light ones.
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a convex spherical (diverging) mirror with a focal length of 25 cm has a 4.0 cm tall object placed 100 cm in front of it. what is the position of the image relative to the mirror?
The image will be located 25 cm behind the mirror.
What is convex spherical mirror?A convex spherical mirror is a curved mirror that is curved outward like a sphere. It is used to reflect light and create a magnified image of the object being reflected. It is also used in telescopes and other optical instruments. The surface of a convex spherical mirror is curved like the outside of a sphere, which causes light rays to diverge and form a virtual, magnified image of the object. The image formed by a convex spherical mirror is always upright, smaller than the object, and located behind the mirror.
This is because the focal length of a convex spherical mirror is equal to the distance from the mirror to the image. In this case, the focal length is 25 cm, so the image is located 25 cm behind the mirror. The image will be inverted, meaning that it will be 4.0 cm tall as well, but will appear upside down. The distance from the mirror to the image will be 125 cm. The magnification of the image will be -1, since the image is inverted.
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What is the effect on the speed of a fighter plane chasing another when it opens fire? What happens to the speed of pursued plane when it returns the fire?
When the fighter plane opens the fire, its momentum will be in backward direction and its speed decreases.When pursued plan opens fire in backward direction.then the momentum of plane will be in forward direction and its speed increases.
while riding an open freight elevator upwards at 5.1 m/s, a carpenter drops his hammer off the side. it hits the ground 2.4 s later. how far above the ground was the carpenter when he dropped the hammer?
By making use of equations of motion, we get the Distance from the ground was the carpenter dropped the hammer is 16 m/s.
Given Parameters are
Initial Velocity (u) = 1.5 m/s
Time taken (t) = 2.4 seconds
The final velocity of the elevator after t sec of time can be calculated using one of the equations of motion, so, we have
v = u + at
Putting all the values, we get
v = 1.5 - (9.8)(2.4) = -18.42 m/s
Distance from the ground was the carpenter dropped the hammer is can be calculated using one of the equations of motion,
[tex]v^{2} = u^{2} + 2gh\\\\h = \frac{v^{2}-u^{2} }{2g} \\\\h =\frac{(-18.42)^{2} -(5.1)^{2} }{2(9.8)} = 16 m/s[/tex]
Resolve the cat speed into components,
[tex]v_{x} = (7m/s) cos 49 = 4.59 m/s\\v_{y} = ( 7 m/s ) sin 49 = 5.28 m/s[/tex]
Cat speed with respect to dog is
[tex]v = \sqrt{v_{x} ^{2} - (v_{y} -v_{d} )^{2} } = \sqrt{(4.59)^{2} +(5.28 - 2.4)^{2} } = 5.42 m/s[/tex]
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consider a system of particles interacting with each other through potentials depending only on the scalar distances between them and acted upon by conservative central forces from a fixed point. obtain the hamiltonian of the particle with respect to a set of axes, with origin at the center of force, which is rotating around some axis in an inertial system with angular velocity w. what is the physical significance of the hamiltonian in this case? is it a constant of the motion?
The Hamiltonian of a system defines its total energy, which is the product of its kinetic energy (that of motion) and potential energy (that of position). No, it is not a constant of motion.
Lagrangian and Hamiltonian definitionsThe distinction between kinetic and potential energy is what gives rise to lagrangian. The Italian mathematician discovered the Lagrangian in the year 1788. Cartesian coordinates are a lagrangian representation. The mathematically sophisticated version of classical mechanics is known as the Hamiltonian.
Hamiltonian mechanics can also be used to derive the radial force formula. The Hamiltonian is denoted by the following in polar coordinates:
The conjugate momentum of the azimuthal angle, p, is a constant of the motion because it does not appear in the Hamiltonian. The Hamiltonian equation of motion for demonstrates that this conjugate momentum is the magnitude L of the angular momentum.
dφ/dt = δH/δpφ = pφ/mr² = L/mr²
The motion equation for r that corresponds to this is
dr/dt = δH/δpr = [tex]p_{r}[/tex]/m
The radial-force equation is obtained by taking the second derivative of r with respect to time and substituting Hamilton's equation of motion for pr.
d²r/dt² = 1/m dpr/dt
d²r/dt² = -1/m (δH/δr)
d²r/dt² = p²φ/m²r³ - 1/m dU/dr
d²r/dt² = L²/m²r³ + 1/mF(r)
No, it is not a constant of motion.
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if we want to see what galaxies looked like at a time close to the beginning of the universe, where should we look?
Answer: 4 billion years ago
Explanation:
calculate the eccentricity for the planet if the distance between foci is 5,000,000 km and the distance of the major axis is 299,000,000 km.
The eccentricity for the planet if the distance between foci is 5,000,000 km and the distance of the major axis is 299,000,000 km is 0.0167.
Calculation:
The eccentricity of an elliptical orbit is defined by the ratio:
e = c/a
where:
c is the distance from the center of the ellipse to either focus
e = eccentricity
a = positive for an elliptical orbit
The eccentricity can be calculated as follows:
e = 5 × 10⁶km ÷ 299 × 10⁶km
e = 0.0167
Eccentricity is also the ratio of the semimajor axis a to the distance d from the center to the directrix. Eccentricity can be represented by flattening. Eccentricity can be defined by how much a conic actually deviates from the shape of a circle.
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light is projected onto a semi-conductive surface. however, no electrons are ejected. if the intensity is held constant but the frequency of light is increased, what will happen?
When the intensity of light is constant, but its frequency is increased, then the number of photons emitted will also increase.
The electrons are emitted from a conductive material when light of sufficient frequency strikes it and causes vibration of electron holes pairs present inside the material. This conductive motion causes the electricity to be generated. There is a minimum frequency which must be reached so that electrons are emitted from the surface. This frequency is called as threshold frequency. Photons are energy packets. The formula which relates energy with frequency is given as:
E = hv,
where, E = energy of photon
h = Planck's constant
v = frequency
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consider the harmonic oscillator with dynamics written as with parameters . if the initial position and velocity of the oscillator are given by , what is the position of the oscillator at seconds?
The position of the oscillator at seconds is ( A cos ( ω t + ϕ ) where A is the amplitude and ϕ is the initial phase and f = 1/T = ω/2π.
What is the mean position in oscillation?Equilibrium or Mean Position: It is a state in which the body is in when there is no net force pushing against it. When a particle is oscillating, it is in its phase This is a representation of the particle's vibrational state at a particular instant.
Is the oscillation period measured in seconds?The period of an oscillating system is the length of time it takes for a cycle to be completed. A system's period is a time measurement, and in physics, it's typically represented by the capital letter T. Although seconds are the most common, period is measured in time units relevant to that system.
What is the equation for an oscillating period?Time, or T, is the oscillation's period, hence ωT = 2π or T = 2π/ω. The formula f = 1/T = ω/2π. gives the reciprocal of the period, or the frequency f, in oscillations per second.
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at what time does the particle have a velocity of 20 mys? (b) at what time is the acceleration 0? what is the significance of this value of t?
The particle moves at a speed of 20 m/s at time t = 0 or t = 5 seconds, respectively. The t-value calculates the magnitude of the difference in relation to the variance in your sample data.
What does velocity vs. speed mean?Velocity, as opposed to speed, refers to the pace of direction of the an object's movement as it moves down a path. In other words, whereas velocity is a vector, speed is a scalar quantity. a=dvdt=d2xdt2
How do velocity and acceleration differ?Velocity refers to the speed at which displacement changes. The pace at which speed changes is known as acceleration. Because it consists both of magnitude and direction, the velocity is a vector quantity. Since acceleration is merely the rate at which velocity changes, it too is a vector quantity.
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How to be good at basketball
Answer: Practice Makes Perfect
Explanation:
First, you would want to exercise:
Warmups:
Stretch:
10 Toe Touches10 Run Poses with each leg in front one at a time.Stretch your arms for 10 secondsDo these every day:
15 push-ups25 Jumping JacksJog for 10 minutes10 Sit-upsThen:
100 Dribbles50 shots5 laps around the whole court25 layups running from 3-pointDo these in a month, and you will improve a lot in basketball.
Hope This Helps
Calculate the energy transferred by an appliance using mains electricity (230v) if the charge is 150c. Give your answer in kilojoules.
The energy transferred by an appliance using mains electricity is 34500 Joule.
What is energy?
In physics, energy is the ability to perform work. It could exist in several different forms, such as potential, kinetic, thermal, electrical, chemical, radioactive, etc. Additionally, there is heat and work, which is energy being transferred from one body to another. Energy is always assigned based on its nature once it has been transmitted.
Given that: charge of the particle: Q = 150 C.
Potential difference applied: V = 230 V.
Hence, the potential energy of the particle: E = QV
= 150 × 230 Joule
= 34500 Joule.
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3) Knowing an object’s position requires which of the following?
A) speed
B) time
C) displacement
D) reference point
which object has greater acceleration when acted on by gravitational forces? a 2 kg apple, a 7 kg bowling ball, or a 20 kg roc
a 20 kg rock has greater acceleration when acted on by gravitational forces Value of g, Escape Velocity, and Gravitational Acceleration img-icon A piece of equipment that is falling freely is one that is only being affected by gravity.
Such an item accelerates downward at a rate of 9.8 m/s/s (on Earth). This particular number has a unique moniker since it is so significant.
The term "acceleration owing to gravity" is used.
acceleration because of The acceleration brought on by the earth's gravitational pull is known as gravity.
A paratrooper who jumps out of an aeroplane falls freely for a while. Because of the gravity of the earth, he accelerates.
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A container of gas at 42 psi is compressed to one sixth it’s original volume. What is the new pressure of the gas?
The ideal gas equation can be changed to demonstrate that the pressure of a sample of gas is directly proportional to the amount of gas present, volume, and temperature being held constant: P=n(RTV)=n×const.
What compressed pressure of the gas?The pressure inside the object increases when medium is added to the newly created area. Because energy is being added during compression, the temperature of the medium may significantly rise or fall.
Therefore, compressing a medium is necessary to raise pressure. Compression reduces the volume of the medium that makes up a thing.
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the radiative zone of the sun is just outside the core which has temperatures of about 7 million degrees celsius. t or f
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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Use the information and table to answer the following question! A skydiver dives from an airplane. air resistance is measured each second following the skydiver’s jump.
Time After Jump Weight Air Resistance
(seconds) Newtons (N) Newtons (N)
1 seconds 500N 200N
2 seconds 500N 300N
3 seconds 500N 400N
4 seconds 500N 500N
Which statement BEST identifies the skydiver's speed at each second?
a. The skydiver has the slowest speed at 2 seconds
b. The skydiver has the fastest speed at 4 seconds
c. The skydiver has the sloweat speed 1 second
d. The skydiver has the fastest speed at 3 seconds
The skydiver has the fastest speed at 4 seconds, and the correct statement is (b) "The skydiver has the fastest speed at 4 seconds".
To determine the skydiver's speed at each second, we need to consider the forces acting on the skydiver. In this case, the forces acting on the skydiver are the weight of the skydiver and the air resistance. The weight of the skydiver is constant at 500 N, while the air resistance increases with time.
According to Newton's second law of motion, the acceleration of an object is equal to the net force acting on it divided by its mass. In this case, the mass of the skydiver is not given, so we cannot calculate the acceleration directly.
Speed is the rate of change of displacement over time. In this case, the displacement of the skydiver is not given, so we cannot calculate the speed directly. However, we can use the information provided to determine the skydiver's speed at each second.
From the table, we can see that the air resistance increases with time, reaching a maximum of 500 N at 4 seconds. This means that the net force acting on the skydiver is greatest at 4 seconds, which would correspond to the highest acceleration and the fastest speed.
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The ________ wave represents atrial depolarization, which manifests as an atrial contraction that originates in the sa node.
The P wave represents atrial depolarization, which manifests as an atrial contraction that originates in the SA node.
40 POINTS HELPP
The Anthropocene is still considered an informal designation because International Union of Geological Sciences (IUGS), the international organization that names and defines epochs, has not officially designated it an epoch. Their criteria for the designation of a new epoch are that there should be evidence of human impacts and change in the rock record.
What activities and impact could humans be responsible for that might be reflected in the rock record and thus determine the beginning of the Anthropocene?
(Minimum of two sentences please)
Answer:
One example of an activity that could be reflected in the rock record and contribute to the beginning of the Anthropocene is the widespread use of fossil fuels, which has led to an increase in atmospheric carbon dioxide concentrations and a corresponding shift in the Earth's climate. Another potential contributor to the Anthropocene is the proliferation of plastic and other synthetic materials, which are becoming ubiquitous in the geologic record and may persist for thousands of years.
