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Rapid heating and cooling can cause cracks to start at the surface of a ceramic material. Sometimes the cracks meet the surface at 90? and sometimes at 45? to the surface. By noting the orientation of a crack, how can one tell whether it initiated on the heating or the cooling portion of the thermal cycle?
A Carnot heat pump is to be used for heating house in winter. The house temperature is set at 25oC. One day the outdoor temperature is 2oC. The house is estimated to lose heat at a rate 55000kJ/h (which equal to Qout of the heat pump).
Determine the initail volume
water occupies the bottom 0.8 m of a cylindrical tank. on top of the water is 0.3 m of kerosene which is open to the
a cube of aluminum 10 cm on each side is initially at a temperature of 300degc and is immersed in a fluid at 100degc.
The yield stress for mild steel is 207 MPa. A specimen has a diameter of 0.01 m and a length of 0.10 m. It is loaded in tension to 1000 N and deflects 6.077 x 10^-6 m.
the masses of blocks a b c and d are 9 kg 9 kg 6 kg and 7 kg respectively. knowing that a downward force of magnitude
liquid water at 70f enters a pump with a volumetric flow rate of 7.71 ft3min through an inlet pipe having a diameter of
draw a block diagram for a closed-loop room temperature control system consisting of a space heater with a single
two cylinders are filled with liquid water ? 1000 kgm3 and connected by a line with a closed valve. a has 100 kg and b
Consider that you are boiling water near its critical heat flux in a pot on the stove without a lid (pressure is atmospheric). Suppose the hot burner has a surface temperature of 128 degrees Celsius. Assume a 1 square meter area. What is the boiling ..
the radiator of a car is a heat exchanger that uses air to cool the coolant assume water from the engine. the heat that
two slender rods of negligible weight are pin-connected at a and attached to the 18-lb block b and the 80-lb block c as
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