The value of coefficient of thermal expansion is always the same for a material. True or False? a) True b) False
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The value of coefficient of thermal expansion is always the same for a material. True or False?
a) True
b) False
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- 4) A ground source heat pump heats a building by extracting heat from the ground and pumping it into the building. Define: Qc = heat extracted from the ground, Qn= heat pumped into the building, W = electric energy used by the heat pump, Tc= temperature of the ground, T = temperature of building (Qc, Qn, and W are positive by definition). Assume Tr > Tc. a) Draw a diagram showing energy flow in and out of the heat pump. b) Write a general expression for the change AS in the entropy of the "universe", that is the heat pump plus the cold and hot reservoirs, in terms of the quantities defined above. Now assume ideal (reversible) operation, and take Te= 10 °C and Tp= 20 °C. What is the coefficient of performance (ČOP) of the heat pump? By what factor would this change if we had Tc = 0 °C instead?Radiation makes it impossible to stand close to a hot lava flow. Calculate the rate of heat transfer by radiation in kilowatts from 1.00 m2 of 1100°C fresh lava into 25.0°C surroundings, assuming lava's emissivity is 1. ______ kWLatent heat from steam to water is 2260000 and from to water is 333000
- AàA steel rod (p=7860 kg/m³) has a length of 3.75 m. It is bolted at both ends between immobile supports. Initially there is no tension in the rod, because the rod just fits between the supports. Find the tension that develops when the rod loses 3190 J of heat. Number ! Units NIce at -12.1 °C and steam at 121 °C are brought together at atmospheric pressure in a perfectly insulated container. After thermal equilibrium is reached, the liquid phase at 44.1 °C is present. Ignoring the container and the equilibrium vapor pressure of the liquid at 44.1 °C, find the ratio of the mass of steam to the mass of ice. The specific heat capacity of steam is 2020 J/(kg C°). af Number i Initial state Units Steam - Ice Equilibrium Water