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A 20.0 kilogram kid stands at the center of a125 kg playground merry-go-round which rotates at 3.10 rad/s. If the kid moves to the edge of the merry-go-round, find what is the new angular velocity of the system? Model the merry-go-round as a solid disk.
a 770 n student stands in the middle of a frozen pond having a radius of 6.3 m. he is unable to get to the other side
Two balls attached to strings have the same mass and volume, but are made of different materials. Which ball excerts a geater net force on the block
A 30 kg launching machine fires a 250 gram projectile horizontally at 100 m/s. This causes the machine to slide backward 1.122 meters before coming to a rest. What surfaces are likely to cause this friction
Two ants race across a table 66 cm long. One travels at4.42 cm/s and the other at 3cm/s. When the first one crosses thefinish line, how far behind is the second one
The 2007 world record for the men's 100m dash was 9.77 seconds. The third place runner crossed the finish line in 10.07 s. how far behind is the third place runner
What is the gravitational force between two 20-kg iron balls separated by a distance of .9 m? What is the height of the table
A rocket is fired at a speed of 75.0 m/s from ground level, at an angle of 60.0 degrees above the horizontal. The rocket is fired toward the ground 11.0-m high wall, which is located 27.0 m away. By how much does the rocket clear the top of the wa..
An artificial lens is implanted in a person's eye to replace a diseased lens. The distance between the artificial lens and the retina is2.82cm. What is the power of the implanted lens
At amusement parks, there is a popular ride where the floor of arotating cylindrical room falls away, leaving the backs of theriders "plastered" against the wall. Suppose the radius of the roomis 3.52 m and the speed of the wall is 11.5 m/s when t..
You throw a ball straight up in the air. The instant after leaving your hand, the balls speed is 30 meters per second. Ignoring the effects of air resistance, predict how fast the ball will be traveling 2 seconds later.
Donovan Bailey set a world record for the 100-m dash on July 27, 1996. If observers on a spaceship moving with a speed of 0.7705 c relative to Earth saw Donovan Bailey's run
A race car(m=800kg) starting from rest completes a 450m dragrace in a time of 3s. what is the engine's average power output
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