M Nick and Paul are rock climbing, each moving up with a constant velocity of 0.85 . Nick has a mass of 68 kg,
S
and Paul has a mass of 82 kg. At one point, Nick is 5.0 m above the ground, and Paul is 1.0 m higher than
m
Nick. Use g = 9.8
82
What is the mechanical energy of the Nick and Paul system at this point?

The diagram shows a series of volcanic island and a hot spot determine the direction of movement of the tectonic plate that for the island

Air is to be preheated by hot exhaust gases in a cross-flow heat exchanger before it enters the furnace. air enters the heat exchanger at 95 kpa and 20°c at a rate of 0.6 m^3/s. the combustion gases (cp = 1.10 kj/kg°c) enter at 160°c at a rate of 0.95 kg/s and leave at 95°c. determine the rate of heat transfer to the air and its outlet temperature.

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.