Q: A typical doughnut contains 2.0 g of protein, 17
A typical doughnut contains 2.0 g of protein, 17.0 g of carbohydrates, and 7.0 g of fat. Average food energy values are 4.0 kcal/g for protein and carbohydrates and 9.0 kcal/g for fat. (a). During he...
See AnswerQ: Shivering is your body’s way of generating heat to restore its internal
Shivering is your body’s way of generating heat to restore its internal temperature to the normal 37 °C, and it produces approximately 290 W of heat power per square meter of body area. A 68-kg, 1.78-...
See AnswerQ: You cool a 100.0-g slug of red-
You cool a 100.0-g slug of red-hot iron (temperature 745° C) by dropping it into an insulated cup of negligible mass containing 85.0 g of water at 20.0 °C. Assuming no heat exchange with the surroundi...
See AnswerQ: Suppose that a steel hoop could be constructed to fit just around
Suppose that a steel hoop could be constructed to fit just around the earth’s equator at 20.0 °C. What would be the thickness of space between the hoop and the earth if the temperature of the hoop wer...
See AnswerQ: A person of mass 70.0 kg is sitting in the
A person of mass 70.0 kg is sitting in the bathtub. The bathtub is 190.0 cm by 80.0 cm; before the person got in, the water was 24.0 cm deep. The water is at 37.0° C. Suppose that the water were to co...
See AnswerQ: (a). A typical student listening attentively to a physics lecture
(a). A typical student listening attentively to a physics lecture has a heat output of 100 W. How much heat energy does a class of 140 physics students release into a lecture hall over the course of a...
See AnswerQ: The molar heat capacity of a certain substance varies with temperature according
The molar heat capacity of a certain substance varies with temperature according to the empirical equation How much heat is necessary to change the temperature of 3.00 mol of this substance from 27...
See AnswerQ: If the air temperature is the same as the temperature of your
If the air temperature is the same as the temperature of your skin (about 30°C), your body cannot get rid of heat by transferring it to the air. In that case, it gets rid of the heat by evaporating wa...
See AnswerQ: (a) By how much would the body temperature of the
(a) By how much would the body temperature of the bicyclist in Problem 17.89 increase in an hour if he were unable to get rid of the excess heat? (b). Is this temperature increase large enough to be...
See AnswerQ: The human vocal tract is a pipe that extends about 17 cm
The human vocal tract is a pipe that extends about 17 cm from the lips to the vocal folds (also called “vocal cords”) near the middle of your throat. The vocal folds behave rather like the reed of a c...
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