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Chapter 14: Q1MCQ (page 390)

When you put an ice cube in a glass of warm tea, which of the following happens?

(a) Cold flows from the ice cube into the tea.

(b) Cold flows from the ice cube into the tea and heat flows from the tea into the ice cube.

(c) Heat flows from the tea into the ice cube.

(d) Neither heat nor cold flows. Only temperature flows between the ice and the tea.

Short Answer

Expert verified

(c) Heat flows from the tea into the ice cube.

Step by step solution

01

Understanding the heat transfer between two bodies

The heat transfer takes place from the hotter body to the colder body. Due to the transfer of heat, the body changes its phase. By the same effect, the temperature of the body will vary accordingly.

02

Explanation for the transfer of heat when the person puts an ice cube into a warm tea

The ice cube is placed in the glass of warm tea. The molecules of the tea move quickly, and the warm molecules have high kinetic energy. In contrast, the molecules of ice have low kinetic energy.

The collision of molecules takes place between the ice molecules and the tea molecules. Due to the high kinetic energy of the tea molecules, a transfer of heat energy takes place from the warmer tea to the ice cube.

Due to the transfer of heat, ice melting occurs, and the tea starts cooling while heating the ice cube. The temperature of the ice cube starts increasing, and the temperature of the tea decreases accordingly.

Thus, heat flows from the tea into the ice cube.

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Most popular questions from this chapter

A piece of wood lying in the Sun absorbs more heat than a piece of shiny metal. Yet the metal feels hotter than the wood when you pick it up. Explain.

A mountain climber wears a goose-down jacket 3.5 cm thick with total surface area \({\bf{0}}{\bf{.95}}\;{{\bf{m}}{\bf{2}}}\). The temperature at the surface of the clothing is \( - {\bf{1}}{{\bf{8}}{\bf{o}}}{\bf{C}}\) and at the skin is 34掳C. Determine the rate of heat flow by conduction through the jacket assuming (a) it is dry and the thermal conductivity k is that of goose down, and (b) the jacket is wet, so k is that of water and the jacket has matted to 0.50 cm thickness.

(II) A 100-W light bulb generates 95 W of heat, which is dissipated through a glass bulb that has a radius of 3.0 cm and is 0.50 mm thick. What is the difference in temperature between the inner and outer surfaces of the glass?

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