A5.0-kg box rests on a horizontal surface. the coefficient of kinetic friction between the box and surface is =0.50. a horizontal force pulls the box at constant velocity for 10 cm. find the work done by (a) the applied horizontal force, (b) the frictional force, and (c) the net force.

Imagine you are riding on a yacht in the ocean and traveling at 20 mph. you then hit a golf ball at 100 mph from the deck of the yacht. you see the ball move away from you at 100mph, while a person standing on a near by beach would observe your golf ball traveling at 120 mph (20 mph + 100 mph). now imagine you are aboard the hermes spacecraft traveling at 0.1c (1/10 the speed of light) past mars and shine a laser from the front of the ship. you would see the light traveling at c (the speed of light) away from your ship. according to einstein’s special relativity, how fast will a person on mars observe the light to be traveling? a) 0.1c (1/10 the speed of light) b) c (the speed of light) c)1.1c (c+0.1c)

What is the coefficient of kinetic friction μk between the block and the tabletop?

Glass has a hardness that is in the middle of the hardness scale. what is the hardness of glass?