Physics for Scientists and Engineers: Foundations and Connections
1st Edition
ISBN: 9781133939146
Author: Katz, Debora M.
Publisher: Cengage Learning
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Chapter 19.4, Problem 19.5CE
To determine
Whether the peg needs to heat or cool before inserting into the hole.
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During a chemistry lab, you take a 0.4 kg sample of ice and put it in a beaker with a thermometer. You then place the beaker with the ice on
0 the temperature of the ice is -18
=
a hot plate, and turn on the hot plate. This hot plate adds heat to the ice at a rate of 330 W. At time t
°C.
Because of the large heat capacity of water and ice, you may assume in this problem that all the heat goes into the sample of ice, and that
we can ignore the amount of heat going into the beaker and thermometer. Also assume no heat escapes from the system.
Some useful values:
●
Specific heat of water: C =
Specific heat of ice: Ci
= 2100 J/kg K
• Latent heat of fusion: L = 334 000 J/kg
●
4200 J/kg K
=
1a) At what time does the ice reach a temperature of -3.5°C?
answer=
units?
1b) At what time has all the ice melted?
answer=
units?
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Check your answer
1c) After the ice has completely melted, we're left with 0.4 kg of water.
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answer=
units?
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What happens to the internal energy of an insulated system when mechanical work is done on it? What happens to its temperature assuming no change of phase occurs?
A: The internal energy increases, but the temperature decreases.
B:Both decrease.
C:The internal energy decreases, but the temperature increases.
D:Both increase.
Two rooms, each a cube 4.0m per side share a 14 Cm thick brick wall. Because of a number of 100 W light bulbs in one room the air is at 30 degree Celsius while in the other room it is 10 degree Celsius. How many of the 100 W bulbs are needed to maintain the temperature difference across the wall?
Chapter 19 Solutions
Physics for Scientists and Engineers: Foundations and Connections
Ch. 19.1 - The Fahrenheit scale remains useful in part due to...Ch. 19.2 - Prob. 19.2CECh. 19.3 - Prob. 19.3CECh. 19.3 - Prob. 19.4CECh. 19.4 - Prob. 19.5CECh. 19.5 - Prob. 19.6CECh. 19.6 - Prob. 19.7CECh. 19 - Prob. 1PQCh. 19 - Prob. 2PQCh. 19 - Prob. 3PQ
Ch. 19 - Prob. 4PQCh. 19 - Prob. 5PQCh. 19 - Prob. 6PQCh. 19 - Prob. 7PQCh. 19 - Prob. 8PQCh. 19 - Object A is placed in thermal contact with a very...Ch. 19 - Prob. 10PQCh. 19 - Prob. 11PQCh. 19 - Prob. 12PQCh. 19 - Prob. 13PQCh. 19 - The tallest building in Chicago is the Willis...Ch. 19 - Prob. 15PQCh. 19 - Prob. 16PQCh. 19 - At 22.0C, the radius of a solid aluminum sphere is...Ch. 19 - Prob. 18PQCh. 19 - Prob. 19PQCh. 19 - Prob. 20PQCh. 19 - The distance between telephone poles is 30.50 m in...Ch. 19 - Prob. 22PQCh. 19 - Prob. 23PQCh. 19 - Prob. 24PQCh. 19 - Prob. 25PQCh. 19 - Prob. 26PQCh. 19 - Prob. 27PQCh. 19 - Prob. 28PQCh. 19 - Prob. 29PQCh. 19 - Prob. 30PQCh. 19 - Prob. 31PQCh. 19 - Prob. 32PQCh. 19 - Prob. 33PQCh. 19 - Prob. 34PQCh. 19 - Prob. 35PQCh. 19 - Prob. 36PQCh. 19 - Prob. 37PQCh. 19 - Prob. 38PQCh. 19 - Prob. 39PQCh. 19 - On a hot summer day, the density of air at...Ch. 19 - Prob. 41PQCh. 19 - Prob. 42PQCh. 19 - Prob. 43PQCh. 19 - Prob. 44PQCh. 19 - Prob. 45PQCh. 19 - Prob. 46PQCh. 19 - Prob. 47PQCh. 19 - A triple-point cell such as the one shown in...Ch. 19 - An ideal gas is trapped inside a tube of uniform...Ch. 19 - Prob. 50PQCh. 19 - Prob. 51PQCh. 19 - Case Study When a constant-volume thermometer is...Ch. 19 - An air bubble starts rising from the bottom of a...Ch. 19 - Prob. 54PQCh. 19 - Prob. 55PQCh. 19 - Prob. 56PQCh. 19 - Prob. 57PQCh. 19 - Prob. 58PQCh. 19 - Prob. 59PQCh. 19 - Prob. 60PQCh. 19 - Prob. 61PQCh. 19 - Prob. 62PQCh. 19 - Prob. 63PQCh. 19 - Prob. 64PQCh. 19 - Prob. 65PQCh. 19 - Prob. 66PQCh. 19 - Prob. 67PQCh. 19 - Prob. 68PQCh. 19 - Prob. 69PQCh. 19 - Prob. 70PQCh. 19 - Prob. 71PQCh. 19 - A steel plate has a circular hole drilled in its...Ch. 19 - Prob. 73PQCh. 19 - A gas is in a container of volume V0 at pressure...Ch. 19 - Prob. 75PQCh. 19 - Prob. 76PQCh. 19 - Prob. 77PQCh. 19 - Prob. 78PQCh. 19 - Prob. 79PQCh. 19 - Prob. 80PQCh. 19 - Two glass bulbs of volumes 500 cm3 and 200 cm3 are...
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- Two rods of the same length and diameter are made from different materials. The rods are to connect two regions of different temperature so that energy will transfer through the rods by heat. They can be connected in series, as in Figure 11.7a (page 363), or in parallel, as in Figure 11.7b. In which case is the rate of energy transfer by heat larger? (a) When the rods are in series. (b) When the rods are in parallel. (c) The rate is the same in both cases.arrow_forwardIf I bring a small object at temperature 200C in thermal contact with a large object at the same temperature, a) thermal energy will flow from the large to the small object because the large object has more internal energy. b) thermal energy will flow from the small to the large object because that will increase entropy. c) thermal energy will not flow.arrow_forwardYour granny normally took a hot 2L hot water bottle (covered with a thin towel and at 50 degrees Celsius) with her to bed on a very cold winters night and it worked quite well. She however decided to replace the water bottle with a huge 2 kg piece of iron (also covered with a towel at 50 degrees Celsius). She only used the 2kg piece of iron for one day and decided to rather always use the hot water bottle throughout the cold winter. Use your knowledge of Physics to explain why granny only used the hot piece of iron for ONE day and went back to using the hot water bottle aferwards.arrow_forward
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- Can you warm a kitchen in winter by leaving the ovendoor open? Can you cool the kitchen on a hot summerday by leaving the refrigerator door open? Explain.arrow_forwardA student living in a 4m x 6m x 6m dormitory room turns on her 150-W fan before he leaves the room on a summer day, hoping that the room will be cooler when she comes back in the evening. Assuming that all the doors and windows are tightly closed and disregarding any heat transfer through the walls and and the windows and he comes back 10 hours later, what is the initial pressure of the air in the room? Use specific heat values at room temperature (Cv=0.718 kJ/kg-K), and assume that the room to be at 15 deg C in the morning when he leaves and 58.1 deg C once he comes back. The molecular mass of the air is 29 g/mol.arrow_forwardExplain why the internal energy of the air increases as the tyre is inflated.arrow_forward
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