Schaum's Outline of College Physics, Twelfth Edition (Schaum's Outlines)
12th Edition
ISBN: 9781259587399
Author: Eugene Hecht
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 20, Problem 35SP
How many joules of heat per hour are produced in a motor that is 75.0 percent efficient and requires 0.250 hp to run it?
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Chapter 20 Solutions
Schaum's Outline of College Physics, Twelfth Edition (Schaum's Outlines)
Ch. 20 - 21. A 2.0 kg metal block (c = 0.137 cal/g • °C) is...Ch. 20 - 22. By how much does the internal energy of 50 g...Ch. 20 - 23. A gas does 100.0 J of work while receiving...Ch. 20 - 24. A 10.0-kg block of lead is heated from 23.0 °C...Ch. 20 - Prob. 25SPCh. 20 - 20.26 [I] It is given that 1.000 g of water...Ch. 20 - 20.27 [I] With the previous problem in mind, what...Ch. 20 - 28. Molecular oxygen having a mass of 10.0 g is in...Ch. 20 - 20.29 [II] Molecular hydrogen gas having a mass of...Ch. 20 - 20.30 [I] A sealed chamber containing 32.5 g of...
Ch. 20 - 20.31 [II] A gas at a pressure of Pa occupies in...Ch. 20 - 32. An ideal heat engine operates between 405 K...Ch. 20 - 20.33 [II] A 70-g metal block moving at 200 cm/s...Ch. 20 - 34. If a certain mass of water falls a distance of...Ch. 20 - 20.35 [II] How many joules of heat per hour are...Ch. 20 - 20.36 [II] A 100-g bullet is initially at 20 °C....Ch. 20 - 20.37 [II] To determine the specific heat of an...Ch. 20 - 38. How much external work is done by an ideal gas...Ch. 20 - 20.39 [I] As 3.0 liters of ideal gas at 27 °C is...Ch. 20 - 20.40 [I] An ideal gas expands adiabatically to...Ch. 20 - 20.41 [I] An ideal gas expands at a constant...Ch. 20 - Prob. 42SPCh. 20 - 20.43 [II] The specific heat of air at constant...Ch. 20 - 20.44 [II] Water is boiled at 100 °C and 1.0 atm....Ch. 20 - 20.45 [II] The temperature of 3.0 kg of krypton...Ch. 20 - Prob. 46SPCh. 20 - 47. Compute the work done in an isothermal...Ch. 20 - 20.48 [II] Five moles of neon gas at 2.00 atm and...Ch. 20 - 20.50 [II] Find the net work output per cycle for...Ch. 20 - Prob. 51SPCh. 20 - 20.52 [II] Figure 20-6 is the diagram for 25.0 g...
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- What is the cost of operating a 3.00-W electric clock for a year if the cost of electricity is 0.0900 per kWh ?arrow_forwardWhat is the efficiency of a subject on a treadmill who puts out work at the rate of 100 W while consuming oxygen at the rate of 2.00 L/min? (Hint: See Table 7.5.)arrow_forwardWhen jogging at 13 km/h on a level surface, a 70-kg man uses energy at a rate of approximately 850 W. Using the facts that the “human engine” is approximately 25 efficient, determine the rate at which this man uses energy when jogging up a 5.0 slope at this same speed. Assume that the frictional retarding force is the same in both cases.arrow_forward
- (a) Calculate the energy in kJ used by a 55.0-kg woman who does 50 deep knee bends in which her center of mass is lowered and raised 0.400 m. (She does work in both directions.) You may assume her efficiency is 20%. (b) What is the average power consumption rate in watts if she does this in 3.00 min?arrow_forwardA typical automobile engine has an efficiency of 25 . Suppose that the engine of a 1000-kg automobile has a maximum power output of 140 hp. What is the maximum grade that the automobile can climb at 50 km/h if the frictional retarding force on it is 300 N?arrow_forwardTricia and Jill bought a brand new blender to make their favorite slush this summer season. This 2.75 kW blender has an efficiency of 94%. Around 825 kJ per kg of ice of energy is used. Calculate how long it will take for Tricia and Jill to finish crushing 3.50 kg of ice.arrow_forward
- Macie and Lala bought a brand new blender to make their favorite slush this summer season. This 2.75 kW blender has an efficiency of 94%. Around 825 kJ per kg of ice of energy is used. Calculate how long it will take for Macie and Lala to finish crushing 3.50 kg of ice.arrow_forwardThe metabolic power for walking is 316 W for Lili. For how long would Lili have to walk to use all the energy available in a can of soda, which energy content is 628 kJ (150 food calorie), in minutes? Your answer needs to have 3 significant figures, including the negative sign in your answer if needed. Do not include the positive sign if the answer is positive. No unit is needed in your answer, it is already given in the question statement.arrow_forwardA lawnmower engine ejects 1.00 x 104 J each second while running with an efficiency of 0.200. Find the engine’s horsepower rating, using the conversion factor 1 hp = 746 W.arrow_forward
- A heat engine extracts 45.0 kJ from the hot reservoir and exhausts 40.0 kJ into the cold reservoir. What are the work done and the efficiency?arrow_forwardThe engine of a large ship does 1.97 1010 J of work with an efficiency of 8.60%. (a) How much waste heat is produced? (b) How many barrels of fuel are consumed if each barrel produces 6.00 109 J of heat when burned?arrow_forwardSimilar to the previous problem, we heat about a cup (230 g) of milk (we'll treat it like water, with a specific heat of 4186 J/kg °C) from refrigerator temperature (5.2 °C) to a comfortable drinking temperature (52.5 °C) in order to make a cup of hot chocolate. First, find the energy required to heat this milk. Next, imagine giving a 1,600 kg truck this same amount of kinetic energy. What speed (in m/s) will the truck be travelling?arrow_forward
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