1.The electromagnetic spectrum contains many types of . A) waves B) Objects C) Particles
2.The colors we see are all part of .
A) X rays B) UV waves C) visible light
3. We can see because of .
A) UV waves B) infrared light C) visible light
4. When visible light passes through a prism or a drop of water, the light and we see a rainbow of color.
A) Bends B) Reflects C) Bounces

A500g object falls off a cliff and losers 100 j from its gravitational potential energy store. if the gravitational field strength g=9.8n/kg, how high is the cliff?

Determine the amount of work done when a crane lifts a 100-n block form 2m above the ground to 6m above the ground

As you are trying to move a heavy box of mass m, you realize that it is too heavy for you to lift by yourself. there is no one around to , so you attach an ideal pulley to the box and a massless rope to the ceiling, which you wrap around the pulley. you pull up on the rope to lift the box. use g for the magnitude of the acceleration due to gravity and neglect friction forces. once you have pulled hard enough to start the box moving upward, what is the magnitude f of the upward force you must apply to the rope to start raising the box with constant velocity? express the magnitude of the force in terms of m, the mass of the box.