Chapter 21, Problem 35A

In the old days, on a cold winter night it was common to bring a hot object to bed with you. Which would be better—a 10-kilogram iron brick or a 10-kilogram jug of hot water at the same temperature? Explain.

To determine

Object that is better to bring to bed.

Answer to Problem 35A

A jug of hot water is better than iron brick.

Explanation of Solution

Given:

The hot objects are 10 kg iron brick and 10 kg jug of hot water.

Formula used:

The amount of heat involved is

$H=cm\Delta T$

As the mass and temperature of both object is same. So, heat involved will be directly proportional to the specific heat capacity. Specific heat of water is higher than iron brick so it will stay hot for longer period which means a jug of water is best in winter days for warming it .

Conclusion:

Therefore,a jug of hot water is better than iron brick.