2) a) Draw what would happen to the grain structure if a metal with small grains were heated to a high temperature (before and after picture).

## 2) a) Draw what would happen to the grain structure if a metal with small grains were heated to a high temperature (before and after picture).

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A gas is initially inside an insulated vessel at a volume V1, a temperature T1, and a pressure P1. The gas then expands adiabatically to a volume V2. Which statement best describes what oc- curs?

## A gas is initially inside an insulated vessel at a volume V1, a temperature T1, and a pressure P1. The gas then expands adiabatically to a volume V2. Which statement best describes what oc- curs?

A farmer runs a heat pump with a motor of 2kW. It should keep a chicken hatchery at 30oC which loses energy at a rate of 0.5kW per degree difference to the colder ambient. The heat pump has a coefficient of performance that is 50% of a Carnot heat pump. What is the minimum ambient temperature for which the heat pump is sufficient?

## A farmer runs a heat pump with a motor of 2kW. It should keep a chicken hatchery at 30oC which loses energy at a rate of 0.5kW per degree difference to the colder ambient. The heat pump has a coefficient of performance that is 50% of a Carnot heat pump. What is the minimum ambient temperature for which the heat pump is sufficient?

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b. Two surfaces A and B are close to each other and are exchanging heat with each other. Surface A is coated with white paint and is maintained at temperature 200oC. It is located directly opposite to surface B which is considered a black body and is maintained at 800oC. Calculate the amount of heat energy that needs to be removed from surface A per unit area to maintain its constant temperature

## b. Two surfaces A and B are close to each other and are exchanging heat with each other. Surface A is coated with white paint and is maintained at temperature 200oC. It is located directly opposite to surface B which is considered a black body and is maintained at 800oC. Calculate the amount of heat energy that needs to be removed from surface A per unit area to maintain its constant temperature

the late 1960s and early 1970s were years of turmoil in the U.S. Psychologists thought that rioting was related to temperature, with hotter weather making people more aggressive. Two investigators, however, argued that “the frequency of riots should increase in temperature beyond this level.” To support their theory, they collected data on 102 riots over the period 1967-71, including the temperature in the city where the riot took place. They plotted a histogram for the distribution of riots by temperature. There is a definite peak around 85 degrees. True or false and explain: the histogram shows that higher temperatures prevent riots

## the late 1960s and early 1970s were years of turmoil in the U.S. Psychologists thought that rioting was related to temperature, with hotter weather making people more aggressive. Two investigators, however, argued that “the frequency of riots should increase in temperature beyond this level.” To support their theory, they collected data on 102 riots over the period 1967-71, including the temperature in the city where the riot took place. They plotted a histogram for the distribution of riots by temperature. There is a definite peak around 85 degrees. True or false and explain: the histogram shows that higher temperatures prevent riots

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4) Determine the temperature at which the diffusivity D of Cu in Al is twice the diffusivity at 500K.

## 4) Determine the temperature at which the diffusivity D of Cu in Al is twice the diffusivity at 500K.

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5) _____ The walls of a food storage facility refrigerator are made of a 2-cm-thick layer of wood (k=0.1 W/m-K) in contact with a 5-cm-thick of polyurethane foam (k= 0.03 W/m-K). If the temperature of the inner surface of the wood is -10 °C and the temperature of the outer surface of the polyurethane foam is 20 °C, the temperature where the two layers are in contact is: a) 11°C b) 8 °C c) 3°C d) -2°C e) -7°C

## 5) _____ The walls of a food storage facility refrigerator are made of a 2-cm-thick layer of wood (k=0.1 W/m-K) in contact with a 5-cm-thick of polyurethane foam (k= 0.03 W/m-K). If the temperature of the inner surface of the wood is -10 °C and the temperature of the outer surface of the polyurethane foam is 20 °C, the temperature where the two layers are in contact is: a) 11°C b) 8 °C c) 3°C d) -2°C e) -7°C

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