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Chapter 15: 15-10Q (page 412)

Can you warm a kitchen in winter by leaving the oven door open? Can you cool the kitchen on a hot summer day by leaving the refrigerator door open? Explain.

Short Answer

Expert verified

It is possible to warm the kitchen by leaving the oven door open, and you cannot cool the kitchen on a hot summer day by leaving the refrigerator door open.

Step by step solution

01

Understanding oven and refrigerator

The oven consists of several elements that can radiate heat energy into the oven cavity. Also, the refrigerator is a device that exhausts more heat than it eliminates from the refrigerated volume.

02

Explaining whether you can warm a kitchen in winter by leaving the oven door open

Yes, it is possible to warm the kitchen through the oven in the winter season. On opening the oven door, the heating elements radiate heat energy into the oven cavity, leading to the kitchen room's warming.

03

Explaining whether you can cool the kitchen by leaving the refrigerator door open

No, it is not possible to cool the kitchen by opening the door of the refrigerator in the summer season. The work done by the refrigerator compressor will warm the room through exhaust instead of cooling it.

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Most popular questions from this chapter

Question: (III) The PV diagram in Fig. 15鈥�23 shows two possible states of a system containing 1.75 moles of a monatomic ideal gas. \(\left( {{P_1} = {P_2} = {\bf{425}}\;{{\bf{N}} \mathord{\left/{\vphantom {{\bf{N}} {{{\bf{m}}^{\bf{2}}}}}} \right.} {{{\bf{m}}^{\bf{2}}}}},\;{V_1} = {\bf{2}}{\bf{.00}}\;{{\bf{m}}^{\bf{3}}},\;{V_2} = {\bf{8}}{\bf{.00}}\;{{\bf{m}}^{\bf{3}}}.} \right)\) (a) Draw the process which depicts an isobaric expansion from state 1 to state 2, and label this process A. (b) Find the work done by the gas and the change in internal energy of the gas in process A. (c) Draw the two-step process which depicts an isothermal expansion from state 1 to the volume \({V_2}\), followed by an isovolumetric increase in temperature to state 2, and label this process B. (d) Find the change in internal energy of the gas for the two-step process B.

Calculate the work done by an ideal gas while going from state A to state C in Fig. 15鈥�28 for each of the following processes:

(a) ADC,

(b) ABC, and

(c) AC directly.

FIGURE 15鈥�28

Problem 68

Question:(II) (a) How much energy is transformed by a typical 65-kg person who runs at\({\bf{15 km/h}}\)for\({\bf{30 min/day}}\)in one week (Table 15鈥�2)? (b) How many food calories would the person have to eat to make up for this energy loss?

Question:(II) A Carnot engine performs work at the rate of 520 kW with an input of 950 kcal of heat per second. If the temperature of the heat source is 520掳C, at what temperature is the waste heat exhausted?

Which of the following possibilities could increase the efficiency of a heat engine or an internal combustion engine?

(a)Increase the temperature of the hot part of the system and reduce the temperature of the exhaust.

(b) Increase the temperatures of both the hot part and the exhaust part of the system by the same amount.

(c) Decrease the temperatures of both the hot part and the exhaust part of the system by the same amount.

(d) Decrease the temperature of the hot part and increase the temperature of the exhaust part by the same amount.

(e) None of the above; only redesigning the engine or using better gas could improve the engine's efficiency.
See all solutions

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