How much work is needed to move an object 20 meters with 40 newtons of force?

Based on the concept of the wave-like nature of light, huygens' theory of light postulates that the more light was "bent" by a substance the slower it would move while traversing across that substance. a) deflection b) interference c) refraction d) resonance

If we relied solely on the nonrenewable resources found in the u.s., which one would we run out of first at current usage levels? a. natural gas b. oil c. uranium d. coal

Efficiency is the ratio of to for a system a)power in to power in b)power in to power out c) power out to power out d) power out to power in