When a sound from a source is refracted away from the surface of the earth, it gives an indication that the
a. air is cooler than the ground. b air has high humidity. c wind is blowing in the direction of the sound. d ground is cooling faster than the air.

Bone-strengthening physical activity done increases bone-mineral content and bone density in youth.

The air that we breath is made mostly of which gaseous molecule

An ice-making machine inside a refrigerator operates in a carnot cycle. it takes heat from liquid water at 0.0 degrees celsius and rejects heat to a room at a temperature of 19.2 degrees celsius. suppose that liquid water with a mass of 76.3kg at 0.0 degrees celsius is converted to ice at the same temperature. take the heat of fusion for water to be l_f = 3.34*10^5 j/kg.how much energy e must be supplied to the device? express your answer in joules.