How long would it take a machine to do 5.000 joules of work if the power rating of the machine
is 100 watts?
A. 5,000 sec
B.
50 sec
C.
10 sec
D. 0.2 sec

Answer : B

Identify the arrows that show the correct direction of heat transfer. 66°f 112°f 98°f

Avery hard rubber ball (m = 0.5 kg) is falling vertically at 4 m/s just before it bounces on the floor. the ball rebounds back at essentially the same speed. if the collision with the floor lasts 0.05 s, what is the average force exerted by the floor on the ball?

Which diagram correctly demonstrates the various forces acting on a ball moving horizontally with some speed?