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Chapter 6: Problem 10

Provide at least one example not listed in the text in which heat flows into some other form of energy. \(^{66}\) In the text, we mentioned hot air over a car, wind, internal combustion, and a steam turbine plant.

Short Answer

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Question: Provide an example of heat flow into some other form of energy, besides the ones mentioned in the text (hot air over a car, wind, internal combustion, and a steam turbine plant). Answer: Heating water on a stovetop is an example of heat flowing into another form of energy. In this process, heat flows from the stovetop to a pot of water, increasing the temperature of the water and eventually causing it to boil and turn into steam. The heat energy is transformed into kinetic energy, changing the water's state from liquid to gas.

Step by step solution

01

Example: Heating Water on a Stovetop

In this example, heat flows from a stovetop to a pot of water, increasing the temperature of the water and eventually causing the water to boil and turn into steam. When the heat is added to the water, it increases the kinetic energy of the water molecules, changing their state from liquid to gas (steam). This transformation from heat to kinetic energy and the phase change from liquid to gas is an example of heat flowing into another form of energy, known as thermal energy.
02

Heat Flow from Stovetop to Pot

In the initial step, we turn on the stovetop, and it starts heating up. The heat generated by the stovetop flows into the pot, which is in contact with the stovetop. The process of heat flow from the heat source (stovetop) to the substance that absorbs the heat (the pot) is called conduction. In this case, the pot is absorbing the heat energy from the stovetop.
03

Heat Flow from Pot to Water

Now that the pot is heated up, the heat from the pot flows into the water inside the pot. This process is also an example of conduction because the heat is being transferred through direct contact between the substances. As the heat flows into the water, the temperature of the water starts to increase.
04

Increasing Water Temperature and Kinetic Energy

As the temperature of the water increases, the kinetic energy of the water molecules also increases due to the added heat energy. The molecules start to move faster and collide with one another more frequently, causing the water to get hotter.
05

Phase Change from Liquid to Gas

Once the water reaches its boiling point, the heat energy causes the water molecules to gain enough kinetic energy to overcome the attractive forces between them. As a result, the water molecules break away from their liquid state and turn into gas (steam). The heat energy has been converted into kinetic energy, transforming the water from a liquid phase to a gaseous phase. This is another example where heat flows into some other form of energy.

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Most popular questions from this chapter

How much will it cost per day to keep a house at \(20^{\circ} \mathrm{C}\) inside when the external temperature is steady at \(-5^{\circ} \mathrm{C}\) using direct electric heating \(^{65}\) if the house is rated at \(150 \mathrm{~W} /{ }^{\circ} \mathrm{C}\) and electricity costs \(\$ 0.15 / \mathrm{kWh} ?\)

In a house achieving a heat loss rate of \(200 \mathrm{~W} /{ }^{\circ} \mathrm{C}\) equipped a \(5,000 \mathrm{~W}\) heater, what will the internal temperature be if the outside temperature is \(-10^{\circ} \mathrm{C}\) and the heater is running \(100 \%\) of the time?

We can think of wind in the atmosphere as a giant heat engine \(^{67}\) operating between the \(288 \mathrm{~K}\) surface and the top of the troposphere \(^{68}\) at \(230 \mathrm{~K}\). What is the maximum efficiency this heat engine could achieve in converting solar heating into airflow?

You score this massive \(1 \mathrm{~kg}\) burrito but decide to put it in the refrigerator to eat later. It comes out at \(5^{\circ} \mathrm{C}\), and you want to heat it in the microwave up to \(75^{\circ} \mathrm{C}\) before eating it. If the microwave puts energy into the burrito at a rate of \(700 \mathrm{~W} .^{61}\) How long should you run the microwave for a high-water- content burrito having an effective specific heat capacity of \(3,000 \mathrm{~J} / \mathrm{kg} /{ }^{\circ} \mathrm{C} ?\)

Changing from direct electrical heating to a heat pump operating with a COP of 3 means spending one-third the energy for a certain thermal benefit. If a house averages \(30 \mathrm{kWh} /\) day in heating cost through the year using direct electrical heating at a cost of \(\$ 0.15 / \mathrm{kWh}\), how long will it take to recuperate a \(\$ 5,000\) installation cost of a new heat pump?
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