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A 24.0 kg child plays on a swing having support ropes that are 2.20 m long. A friend pulls her back until the ropes are 45.0 degrees from the vertical and releases her from rest. What is the potential energy for the child just as she is released, compared with the potential energy at the bottom of the swing? How fast will she be moving at the bottom of the swing? How much work does the tension in the ropes do as the child swings from the initial position to the bottom?
A skid mark has length 25 m. You measure the coefficient of friction between the tire and road as 0.50. determine the initial speed of the car
A train is traveling up a 3.3 incline at a speed of 2.45 when the last car breaks free and begins to coast without friction. Explain how long does it take for the last car to come to rest momentarily?
A gas with initial conditions (P,V,T)i expands isothermally until the final volume=8.192 times the initial volume, find the ratio of the final pressure to the intial pressure
the snow exerts a retarding force on the sled that points opposite to the direction of motion, and has a magnitude of 57. Find out the acceleration of the sled and child.
A bullet of mass 0.018kg traveling horizontally at a high speed of 290m/s embeds itself in a block of mass 4 kg that is sitting at rest on a nearly frictionless surface.
An automobile of mass 1500 kg moving at 25m/s collides with a truck of mass 4500 kg at rest. What is the final velocity of the car after the collision
Suppose the length of a clock's pendulum is changed by 1.000%, exactly at noon one day. What time will it read 24.00 hours later, assuming it the pendulum has kept perfect time before the change? Note that there are two answers, and perform the ca..
A spherical mirror is polished on both sides. When the concave side is used as a mirror, the magnification is +2.3. What is the magnification when the convex side is used as a mirror
A model rocket is launched straight upward with an initial speed of 47.8m/s. It accelerates with a constant upward acceleration of 2.07m/s2 until its engines stop at an altitude of 157 m. What is the maximum height reached by rocket.
How high a tree would a 79.0 kg person have to climb to increase his gravitational potential energy relative to the ground by that amount.
RLC alternating current circuit with a 25 ohm resistor, What is the average power when operating at twice the resonant frequency
Imagine two Einstein solids in thermal contact. A has 300 atoms and B has 200 atoms, and qtotal = 100, how many macrostates are there
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