8. What is not changed when work is done by a machine?

7. How large is the moon compared to Earth? a. about the same diameter as Earth b. about one-half the diameter of Earth c. about one-fourth the diameter of Earth d. about one-eighth the diameter of Earth

A man has a mass of 30kg on earth. What is his weight?

When an object is moving in the air, the air drag force is in the opposite direction to the velocity. consider a light foam ball that is thrown up into the air?

The more you stretch a rubber band, the more you can feel it pulling back on your fingers. Which of Newton's laws BEST explains WHY? A. first B. second C. third

Lenses are often coated with magnesium fluoride (refractive index n = 1.38) to reduce reflections. How thick should the layer of magnesium fluoride be if reflections from the coating surface interfere destructively with those from the coating-glass

A 26-g steel-jacketed bullet is fired with a velocity of 630 m/s toward a steel plate and ricochets along path CD with a velocity 500 m/s.

A small boat is carrying four people across a river. Without any paddling, the boat moves downstream at a steady speed of 5 m/s. If the average weight of the four people is 60 kg, then what is the speed of the boat after one person gets?

Does temperature affect the dissolving phase?

In a clear, coherent, paragraph-length answer, explain why the speed of the apple half way between the release and the maximum height is not half the initial speed.

In pea plants Round (R) is a dominant trait and wrinkled nose (r) is a recessive trait. Which combination would result in wrinkled seeds? 1. RR 2. Rr 3. rr 4. ww