A disk-shaped merry go round (I=1/2 MR2 M=500 kg R=2m) is initially at rest. A ring (i=mr2 m=300 kg r=0.5 m) rotating at 5 rad/s is dropped onto the non-rotating merry go round. The tricky bit is that it was not dropped onto the center of the merry go round. Rather it is dropped at 1.5 m from the merry go round's axis of rotation. After the collision the merry go round is now rotating with the ring riding on it off center. What is the angular velocity of the merry go round?

Many machines- including inclined planes such as ramps- increase the strength of the force put into the machine but decrease the distance over which the force is applied.

Aball is thrown upward. at a height of 10 meters above the ground, the ball has a potential energy of 50 joules (with the potential energy equal to zero at ground level) and is moving upward with a kinetic energy of 50 joules. what is the maximum height h reached by the ball? consider air friction to be negligible. 1. h ≈ 10 m 2. h ≈ 50 m 3. h ≈ 30 m 4. h ≈ 40 m 5. h ≈ 20 m 003 10.0 points which of the two object shown below has the greatest kinetic energy? a m b 1 2 m v 2v 1. kinetic energies are the same. 2. a 3. b 4. unable to determine. 004 10.0 points tim, with mass 74.6 kg, climbs a gymnasium rope a distance of 3.1 m. the acceleration of gravity is 9.8 m/s 2 . how much potential energy does tim gain? answer in units of j. 005 10.0 points a car is moving at 64 miles per hour. the kinetic energy of that car is 5 × 105 j. how much energy does the same car have when it moves at 111 miles per hour? answer in units of j. 006 10.0 points an 102 kg man climbs up a 1 m high flight of stairs. the acceleration of gravity is 9.81 m/s 2 . w

When the magnetic domains in a material can be aligned, but eventually drift out of alignment, the material is