Car a
mass: 1,500 kg
velocity: 10 m/s
car b
mass: 1,500 kg
velocity: 25 m/s
car c
mass: 1,000 kg
velocity: 10 m/s
which order shows decreasing momentum?
~a, b, c
~b, a, c
~c, b, a

In what direction does the medium move relative to the direction of the wave? explain.

If a refrigerator is a heat pump that follows the first law of thermodynamics, how much heat was removed from food inside of the refrigerator if it released 380j of energy to the room?

The focal length of a relaxed human eye is approximately 1.7 cm. when we focus our eyes on a close up object, we can change the refractive power of the eye by about 16 diopters. (a) does the refractive power of our eyes increase or decrease by 16 diopters when we focus closely? explain. (b) calculate the focal length of the eye when we focus closely.