Pick the best description of energy efficiency? a efficiency is equal to the ratio of energy you put into the energy you get out b efficiency is equal to the ratio of energy you get out to the energy you put in c efficiency is equal to the sum of the energy you put into the energy you get out

The graph represents the distance a car travels over time while on the highway. which statement about the car's trip is accurate? a) the car does not move over time. b) the car travels at a constant velocity. c) the car's velocity increases constantly over time. d) the car's velocity decreases constantly over time.

What is the weight of a feather (mass = 0.0001 kg) that floats through earth's and the moon's atmospheres?

Ascientist notices that an oil slick floating on water when viewed from above has many different colors reflecting off the surface, making it look rainbow-like (an effect known as iridescence). she aims a spectrometer at a particular spot and measures the wavelength to be 750 nm (in air). the index of refraction of water is 1.3