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Chapter 14: Q13Q (page 390)

If you hear that an object has 鈥渉igh heat content,鈥� does that mean that its temperature is high? Explain.

Short Answer

Expert verified

No, the object that has high heat content does not need to have a high temperature.

Step by step solution

01

Relationship between specific heat and heat energy

The relationship between the specific heat and heat energy of a substance is linear. Thus, for a higher value of the heat energy, the value of the specific heat of the substance is also higher.

02

Step 2:Explanation for why an object that has high heat content does not have a high temperature

Suppose two samples of different substances have equal masses and temperatures. Now, a certain amount of heat energy is given to both of them. It increases the temperature of both the samples but the sample having larger specific heat has a lower final temperature. However, the heat content is the same for both substances related to their initial state.

Thus, it is possible that an object composed of a material with very large specific heat has high heat content but not at a high temperature.

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Most popular questions from this chapter

(II) A 28-g ice cube at its melting point is dropped into an insulated container of liquid nitrogen. How much nitrogen evaporates if it is at its boiling point of 77 K and has a latent heat of vaporization of 200 kJ/kg? Assume for simplicity that the specific heat of ice is a constant and is equal to its value near its melting point.

Explain why air temperature readings are always taken with the thermometer in the shade.

(II) Two rooms, each a cube 4.0 m per side, share a 14-cm thick brick wall. Because of a number of 100-W light bulbs in one room, the air is at 30掳C, while in the other room it is at 10掳C. How many of the 100-W bulbs are needed to maintain the temperature difference across the wall?

(II) A 55-g bullet traveling at 250 m/s penetrates a block of ice at 0掳C and comes to rest within the ice. Assuming that the temperature of the bullet does not change appreciably, how much ice is melted as a result of the collision?

The temperature of the glass surface of a 75-W lightbulb is 75掳C when the room temperature is 18掳C. Estimate the temperature of a 150-W lightbulb with a glass bulb the same size. Consider only radiation, and assume that 90% of the energy is emitted as heat.
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