an HV battery radiator has intake air routed through the cooling fins of the or heat exchanger before it circulates over the battery packs

In the winter, in order to keep the classroom steadily at 68 f before 10 pm, heating with an average rate of 42,000 btu/hr is provided. assume the outdoor temperature maintains at 32°f, determine the electrical power (kw) required to (a) operate a reversible heat pump (b) operate a real heat pump with a cop (7) of 4.5 and (c) operate an electrical-resistance heater.

Avertical steel rod of length 2.0 m and diameter 25 mm is rigidly fixed at its upper end and has a flange at its lower, free, end. what will be the maximum stress produced in the rod when a load of 20 kn is applied, (a) gradually to the lower end, (b) suddenly to the lower end, (c) by a collar falling from a height of 50 mm on to the flange?

There is a metal plate with thickness, thermal conductivity, density, and specific heat of 10 mm, 200 w/m.°c, 2500 kgrn3, and 900 j/kg. k, respectively. it has an initial uniform temperature of 22°c and is being heated in an oven for 2 minutes. air in the oven is maintained at 900 c with convection heat transfer coefficient of 190 w/m. k. determine the temperature of the plate when it is removed from the oven.