   Chapter 12, Problem 16P

Chapter
Section
Textbook Problem

In a running event, a sprinter does 4.8 × 105 J of work and her internal energy decreases by 7.5 × 105 J. (a) Determine the heat transferred between her body and surroundings during this event. (b) What does the sign of your answer to part (a) indicate?

(a)

To determine
The heat transferred between the body and surroundings during the event.

Explanation

Given Info:

The work done by the sprinter is 4.8×105J .

The internal energy decrease of the body after the work is 7.5×105J .

Formula to calculate the heat transferred between the body and surroundings is,

Q=ΔUW

• ΔU is the change in internal energy
• W is the work done

Since, the work is done on the environment by the body; the work done by the body is negative.

So, W=4.8×105J .

Since, the internal energy of the body is decreasing and a work is done on the environment, the internal energy of the body is negative.

So, ΔU=7.5×105J

Substitute 4.8×105J for W and 7

(b)

To determine
the meaning of the sign of part (a) answer.

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