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A heat engine operates between two reservoirs at 850C and 20C. One -half of the work output of the heat engine is used to drive a Carnot heat pump that removes heat from the cold surroundings at 2C and transfers it to a house maintained at 22C. If the house is losing heat at a rate of 20 kJ/s, determine the minimum rate of heat supply to the heat engine required to keep the house at 22C.
an ideal gas of mass 2 kg is contained within a rigid cylinder and undergoes a cycle which consists of three separate
thermopane window consists of two 6 -mm thick glasses separated by a stagnant air space of thickness 6 mm. the thermal
The humidity of air can be determined by use of two different thermometers; a 'dry bulb' thermometer and a 'wet bulb' thermometer. explain how these thermometers can be used to estimate the amount of water vapour in the air.
a gas turbine operates with a regenerator and two stages of reheating and intercooling. this system is designed so that
two blocks a and b of mass 8 kg and 12 kg respectively hang from a cable which passes over a pulley of negligible mass.
the following factors need to be tested through a doe. it deals with a product made from these constituents. the
a shearing machine cuts flat sheet steel strips 100mm wide by 25mm thick and 6j of work are required per square mm cut.
consider the following states of biaxel stress 1 sigma1 30 sigma2 0. 2 sigma1 30 sigma2 -15
suppose that a nuclear plant generates heat in the amount of 2 x 107 j from its fuel rods at a temperature of 1200c and
two boys push on the gate as shown. if the boy at b exerts a force of fb 30 lb determine the magnitude of the force fa
in a design test of penetration resistance a 12-gram bullet is fired through a 400-mm stack of fibrous plates with an
a jet of air from a nozzle is blown at right angles against a wall in which a pressure tap is located. a manometer
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