Question

1)A 7.50 kg disk with a diameter of 88.0 cm is spinning at a rate of 280 revolutions per minute. A block of wood is pressed into the edge of the disk with a force of 35.0 N. The coefficient of friction between the wood and the disk is 0.300. How long does it take the disk to stop spinning?

A)4.60s B)22.0s C)15.0s D)1.20s E)8.90s

2)The moon has a mass of 7.40 x 10^22 kg and a diameter of 3476 km. A baseball is dropped from a height of 4.70 m above the surface of the moon. How long does it take for the baseball to fall to the surface?

A)2.40s B)11.0s C)9.50s D)1.28s E)4.30s

3)A 6.50 kg bowling ball rolls without slipping down an incline. The bowling ball starts at a height of 8.60 m. What is its rotational kinetic energy when it reaches the ground?

A)157J B)973J C)439J D)248J E)97.6J

PLEASE ANSWER ASAP, I WILL RATE FOR SURE, THANK YOU!

Answer 1