Chapter 19: Q. 1 (page 542)
When a space capsule returns to earth, its surfaces get very hot as it passes through the atmosphere at high speed. Has the space capsule been heated? If so, what was the source of the heat? If not, why is it hot?
a. No, the space capsule is not heated.
b. Kinetic energy is the source of heat.
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A block of iron is removed from an furnace and
immediately dropped into 200 mL of C water. What fraction
of the water boils away?
The ends of a 20-cm-long, 2.0-cm-diameter rod are maintained at and by immersion in an ice-water bath and boiling water. Heat is conducted through the rod at 4.5 * 104 J per hour. Of what material is the rod made?
The volume of a gas is halved during an adiabatic compression that increases the pressure by a factor of 2.5.
a. What is the specific heat ratio g?
b. By what factor does the temperature increase?
Radiation from the head is a major source of heat loss from the human body. Model a head as a 20-cm-diameter, 20-cm-tall cylinder with a flat top. If the body’s surface temperature is 35°C, what is the net rate of heat loss on a chilly 5°C day? All skin, regardless of color, is effectively black in the infrared where the radiation occurs, so use an emissivity of 0.95.
A 5.0 g ice cube at -20°C is in a rigid, sealed container from which all the air has been evacuated. How much heat is required to change this ice cube into steam at 200°C? Steam has CV = 1500 J/kgK and CP = 1960 J/kgK
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