1.4 Heat Transfer, Specific Heat, and Calorimetry

Heat as energy in transit, specific heat of different materials, and calorimetry where a hot object and a cold one settle at one final temperature.

University Physics Volume 2, 1.4 Heat Transfer, Specific Heat, and Calorimetry

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9 exercises

1.4 Exercise 1

If 25 kJ is necessary to raise the temperature of a rock from $25 °\text{C} \text{to} 30 ° \text{C},$ how much heat is necessary to heat the rock from $45 °\text{C} \text{to} 50 ° \text{C}$ ?

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1.4 Exercise 2

How is heat transfer related to temperature?

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1.4 Exercise 4

When heat transfers into a system, is the energy stored as heat? Explain briefly.

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1.4 Exercise 6

On a hot day, the temperature of an 80,000-L swimming pool increases by $1.50 ° \text{C}$ . What is the net heat transfer during this heating? Ignore any complications, such as loss of water by evaporation.

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1.4 Exercise 8

The same heat transfer into identical masses of different substances produces different temperature changes. Calculate the final temperature when 1.00 kcal of heat transfers into 1.00 kg of the following, originally at $20.0 ° \text{C}$ : (a) water; (b) concrete; (c) steel; and (d) mercury.

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1.4 Exercise 10

A $0.250 -\text{kg}$ block of a pure material is heated from $20.0 ° \text{C}$ to $65.0 ° \text{C}$ by the addition of 4.35 kJ of energy. Calculate its specific heat and identify the substance of which it is most likely composed.

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1.4 Exercise 12

(a) The number of kilocalories in food is determined by calorimetry techniques in which the food is burned and the amount of heat transfer is measured. How many kilocalories per gram are there in a 5.00-g peanut if the energy from burning it is transferred to 0.500 kg of water held in a 0.100-kg aluminum cup, causing a $54.9 - ° \text{C}$ temperature increase? Assume the process takes place in an ideal calorimeter,…

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1.4 Exercise 14

In a study of healthy young menJW Vezina, “An examination of the differences between two methods of estimating energy expenditure in resistance training activities,” Journal of Strength and Conditioning Research, April 28, 2014, http://www.ncbi.nlm.nih.gov/pubmed/24402448, doing 20 push-ups in 1 minute burned an amount of energy per kg that for a 70.0-kg man corresponds to 8.06 calories (kcal). Ho…

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1.4 Exercise 16

Repeat the preceding problem, assuming the water is in a glass beaker with a mass of 0.200 kg, which in turn is in a calorimeter. The beaker is initially at the same temperature as the water. Before doing the problem, should the answer be higher or lower than the preceding answer? Comparing the mass and specific heat of the beaker to those of the water, do you think the beaker will make much diffe…

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