College Physics
2nd Edition
ISBN: 9780134601823
Author: ETKINA, Eugenia, Planinšič, G. (gorazd), Van Heuvelen, Alan
Publisher: Pearson,
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Question
Chapter 15, Problem 4MCQ
To determine
The correct statement if the specific heat of water is
(a) one kilogram of water stores 4200 J of energy when its temperature is
(b) if you add 4200 J to water, its temperature will increase by
(c) if you add 42,000 J to 1 kg of water, its temperature will increase by
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The temperature of water in a swimming pool decreases by 5.0 K during the night. The mass of the water in the pool is 560,000 kg. How much heat does the water lose? The specific heat capacity of water is 4,190 J/kgK
A. 670 J or 6.7 x 10^2 J
B. 11,732,000,000 J or 1.1 x 10^10 J
C. 130 J or 1.3 x 10^2 J
D. 24,000,000,000 J or 2.4 x 10^10 J
1. If 60 kJ of heat energy are added to 2 kg of water at 30°C, what will be the final temperature of the water? The specific heat of water is 4186 J/kg·°C.
2. How long (in seconds) will it take to heat 40 kg of water from 40°C to 80°C with a 20-kW immersion heater? Assume no energy is lost to the environment and specific heat of water is 4.186 kJ/kgoC.
3.
The heat of vaporization of water is 2260 kJ/kg and the heat of fusion of water is 335 kJ/kg. Use the specific heat of water is 4.186 kJ/kg·oC
3a) How much energy (in kJ) will it take to raise the temperature of water (15 kg) from 0°C to 100oC?
3b) How much energy (in kJ) would it take to then completely convert the water to steam?
4. You want to raise the temperature of 22kg of water from 60°C to 95°C. If electricity costs $0.08/kWh, how much would it cost you to use an electric heater for this process? Use the specific heat of water is 4.186 kJ/kgoC and 1 kJ = 0.00028 kWh.
In an industrial factory, four different materials are heated up for the same temperature difference by providing
energy. Which of the material will need more energy for the same temperature increase if
O a. Nickle (C = 502.416 J/kg K)
O b. Cobalt (C = 418.68 J/kg K)
O c. Iron (C = 460.548 J/kg K)
O d. Gold (C = 125.604 J/kg K)
Chapter 15 Solutions
College Physics
Ch. 15 - Review Question 15.1 Imagine that a balloon...Ch. 15 - Prob. 2RQCh. 15 - Prob. 3RQCh. 15 - Review Question 15.4 Describe two situations in...Ch. 15 - Prob. 5RQCh. 15 - Review Question 15.6 Why are the units for...Ch. 15 - Prob. 7RQCh. 15 - An ideal gas in a container is separated with a...Ch. 15 - 2. A container of gas has a movable piston, which...Ch. 15 - Prob. 3MCQ
Ch. 15 - Prob. 4MCQCh. 15 - 5. How much heat is stored in 10 kg of water at...Ch. 15 - We define the specific heat of a material as the...Ch. 15 - Prob. 7MCQCh. 15 - Figure Q15.8 shows a P-versus-V graph for two...Ch. 15 - 9. An electric heater is keeping the inside of a...Ch. 15 - Match each heating mechanism (left column) with a...Ch. 15 - 11. Your friend says, "Heat rises." Do you agree...Ch. 15 - Suggest practical ways for determining the...Ch. 15 - Suggest practical ways to measure heats of melting...Ch. 15 - Prob. 14CQCh. 15 - 15. Why does an egg take the same time interval to...Ch. 15 - Why does food cook faster in a pressure cooker...Ch. 15 - A potato into which several nails have been pushed...Ch. 15 - Explain why double-paned windows help reduce...Ch. 15 - 19. The water in a paper cup can be boiled by...Ch. 15 - Provide two reasons why blowing across hot soup or...Ch. 15 - 21. Placing a moistened finger in the wind can...Ch. 15 - Why does covering a keg of beer with wet towels on...Ch. 15 - 23. Explain why dogs can cool themselves by...Ch. 15 - 24. Some houses are heated by hot oil or water...Ch. 15 - If on a hot summer day you place one bare foot on...Ch. 15 - 26. A woman has a cup of hot coffee and a small...Ch. 15 - * EST Estimate the thermal energy of the air in...Ch. 15 - A balloon of volume 0.010 m3 is filled with 1.0...Ch. 15 - * Imagine that the helium balloon from the...Ch. 15 - 4. *You accidentally release a helium-filled...Ch. 15 - * Helium in a cylinder with a piston and initially...Ch. 15 - Prob. 7PCh. 15 - 8. * Jeopardy problem A gas process is described...Ch. 15 - 9. * Jeopardy problem A gas process is described...Ch. 15 - 10. Use the first law of thermodynamics to devise...Ch. 15 - Prob. 11PCh. 15 - Prob. 12PCh. 15 - Prob. 13PCh. 15 - 14 *You are making a table for specific heats of...Ch. 15 - Prob. 15PCh. 15 - 16. * BIO EST Body temperature change A drop in...Ch. 15 - 17. * BIO Temperature change of a person A 50-kg...Ch. 15 - Determine the amount of thermal energy provided by...Ch. 15 - 19. EST Estimate the time interval required for a...Ch. 15 - Prob. 20PCh. 15 - * BIO Exercising warms body A 50-kg woman...Ch. 15 - Prob. 22PCh. 15 - * You add 20C water to 0.20 kg of 40C soup After a...Ch. 15 - BIO Cooling a hot child A 30-kg child has a...Ch. 15 - Prob. 25PCh. 15 - 26. * You pour 250 g of tea into a Styrofoam cup,...Ch. 15 - Prob. 27PCh. 15 - Prob. 28PCh. 15 - 29. Determine the energy needed to change a...Ch. 15 - 30. * When of energy is removed from 0.60 kg of...Ch. 15 - Prob. 31PCh. 15 - C that must be added to a cup with 250 g of tea at...Ch. 15 - An ice-making machine removes thermal energy from...Ch. 15 - Prob. 34PCh. 15 - Prob. 35PCh. 15 - 36. How much energy is required to convert (a)...Ch. 15 - 37. Cooling with alcohol rub During a back rub, 80...Ch. 15 - 38. Energy in a lightning flash A lightning flash...Ch. 15 - 39 A kettle containing 0.75 kg of boiling water...Ch. 15 - Prob. 40PCh. 15 - * EST Energy changes when it rains Estimate the...Ch. 15 - 42. * Insulating a house You insulate your house...Ch. 15 - C and the outside temperature is -10C?Ch. 15 - Prob. 44PCh. 15 - 45. While blowing across the bowl of soup in the...Ch. 15 - Prob. 46PCh. 15 - BIO Marathon You are training for a marathon While...Ch. 15 - Prob. 48PCh. 15 - 49. * A canteen is covered with wet canvas. If 15...Ch. 15 - * EST Evaporative cooling Each year a layer of...Ch. 15 - Prob. 51PCh. 15 - BIO Tree leaf A tree leaf of mass of 0.80 g and...Ch. 15 - Warming a spaceship Your friend says that natural...Ch. 15 - Prob. 54PCh. 15 - Which is less dense: dry or wet air? Explain your...Ch. 15 - * BIO Losing liquid while running While running,...Ch. 15 - Prob. 57PCh. 15 - 58. ** EST Global climate change Assume that...Ch. 15 - Prob. 59PCh. 15 - * Standard house 2 On the same day in the same...Ch. 15 - * Standard house 3 Suppose that the following...Ch. 15 - Prob. 62PCh. 15 - ** BIO EST Metabolism warms bedroom Because of its...Ch. 15 - Prob. 65GPCh. 15 - * EST House ventilation For purposes of...Ch. 15 - Prob. 67GPCh. 15 - ** EST Heating an event center with metabolic...Ch. 15 - Prob. 70RPPCh. 15 - Prob. 71RPPCh. 15 - Prob. 72RPPCh. 15 - Prob. 73RPPCh. 15 - Prob. 74RPPCh. 15 - Prob. 75RPPCh. 15 - Prob. 76RPPCh. 15 - Prob. 77RPPCh. 15 - Prob. 78RPPCh. 15 - Prob. 79RPPCh. 15 - Prob. 80RPP
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