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A 3kg object moving in the positive x direction has a one-dimensional elastic collision with a 5kg object initially at rest .After the collision the 5kg object has a velocity of 6m/s in the positive x direction. What was the initial speed of the 3kg object?
what is the sign of the charge on the electroscope that you charged by induction, What evidence do you have to support your answer
When a large star becomes a supernova, its core may be compressed so tightly that it becomes a neutron star, what is the speed of a particle (in km/s) on the star's equator
A box is sliding across a board that make an angle of 15 degrees with the horizontal. What is the acceleration of the box
A 500g model rocket is on a cart that is rolling to the right at a speed of 3.0m/s. The rocket engine, At what horizontal distance left of the hoop should you launch
A person in a cave emits a sound and receives an echo 2.5 seconds later. How far is that person away from the wall
a 75 kg swimmer dives horizontally off a 500 kg raft. if the divers speed immediately after leaving the raft is 4 ms
The length of a moving spaceship is 27.0 m according to an astronaut on the spaceship. If the spaceship is contracted by 14.5 cm according to an Earth observer, what is the speed of the spaceship
A machinist turns the power on to a grinding wheel, at rest, at time t=0 s. What is the angular velocity in the time interval from t=0 to t=25s
A ring with radius R has a total charge Q uniformly distributed around it. To leading order, find the electric field at a point along the axis of the ring, a very small distance z from the center
When the plane atats to accelerate for take off, a man is holding the pocket watch steady by its 20cm chain, Estimate the takeoff velocity of the plane
Calculate the average kinetic energy and the average potential energy for the 2nd excited state of a harmonic oscilator. use expectation values to calculate a quantum mechanical average, show integrations.
A generator of frequency 2500 Hzdrives a series RLC circuit with an emf amplitude of 120V. The resistance is 3.1 , the capacitance is1.60 µF, What is the current amplitude
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