The average weight of americans has increased over the years. what is the average mass of an american male in 2010 degrees (there is approximately 2.2 pounds in one kilogram.

a) 1.1 x 10^-2 kg
b)8.8 x 10^1 kg
c) 2.0 x10^2 kg
d) 4.3 x10^2 kg

The percent efficiency of a machine can never be 100% (or greater), because in the real world some energy is always converted into a. heat b. work c. input force d. output force

6–55 refrigerant-134a enters the condenser of a residential heat pump at 800 kpa and 358c at a rate of 0.018 kg/s and leaves at 800 kpa as a saturated liquid. if the compressor consumes 1.2 kw of power, determine (a) the cop of the heat pump and (b) the rate of heat absorption from the outside air.

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