Determine the number of revolutions turned during both the startup and shutdown periods. also determine the number of revolutions turned during the first half of each period. assume uniform angular acceleration in both cases.

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.

Carbon-14 is a radioactive element that undergoes beta decay. which force is responsible for allowing carbon-14 to become stable? electromagnetic gravitational weak nuclear strong nuclear

Why is the energy that results from a roller coaster's position at the top of a hill referred to as potential energy?