11. What is the mass of an object which has 2400 J of KE when traveling at 5 points 6 m/s?
63 kg
130 kg
270 kg
400 kg

If a clock aboard a space ship traveling at 0.900 c of the speed of light relative to earth chimes once at the beginning of the hour and again when it reads one hour later, how much time would an observer on earth say elapsed between the two chimes?

Carbon 14 is a naturally occurring stable

How much energy must a refrigerator absorb from 225 g of water so that the temperature of the water will drop from 35°c to 5°c