Q: A weightlifter has a basal metabolic rate of 80.0 W
A weightlifter has a basal metabolic rate of 80.0 W. As he is working out, his metabolic rate increases by about 650 W. (a) How many hours does it take him to work off a 450-Calorie bagel if he stays...
See AnswerQ: Sweating is one of the main mechanisms with which the body dissipates
Sweating is one of the main mechanisms with which the body dissipates heat. Sweat evaporates with a latent heat of 2430 kJ/kg at body temperature, and the body can produce as much as 1.5 kg of sweat p...
See AnswerQ: A woman jogging has a metabolic rate of 625 W.
A woman jogging has a metabolic rate of 625 W. (a) Calculate her volume rate of oxygen consumption in L/s. (b) Estimate her required respiratory rate in breaths/min if her lungs inhale 0.600 L of air...
See AnswerQ: Suppose a highly trained athlete consumes oxygen at a rate of 70
Suppose a highly trained athlete consumes oxygen at a rate of 70.0 mL/(min · kg) during a 30.0-min workout. If the athlete’s mass is 78.0 kg and their body functions as a heat engine with a 20.0% effi...
See AnswerQ: A Carnot engine operates between the temperatures Th = 1.00
A Carnot engine operates between the temperatures Th = 1.00 x 102°C and Tc = 20.0°C. By what factor does the theoretical efficiency increase if the temperature of the hot reservoir is increased to 5.5...
See AnswerQ: A 1500-kW heat engine operates at 25% efficiency.
A 1500-kW heat engine operates at 25% efficiency. The heat energy expelled at the low temperature is absorbed by a stream of water that enters the cooling coils at 20.°C. If 60. L flows across the coi...
See AnswerQ: A Carnot engine operates between 100°C and 20°C
A Carnot engine operates between 100°C and 20°C. How much ice can the engine melt from its exhaust after it has done 5.0 x 104 J of work?
See AnswerQ: A substance undergoes the cyclic process shown in Figure P12.65
A substance undergoes the cyclic process shown in Figure P12.65. Work output occurs along path AB while work input is required along path BC, and no work is involved in the constant volume process CA....
See AnswerQ: If electrical power is transmitted over long distances, the resistance of
If electrical power is transmitted over long distances, the resistance of the wires becomes significant. Why? Which mode of transmission would result in less energy loss: high current and low voltage...
See AnswerQ: When a gas follows path 123 on the PV diagram in Figure
When a gas follows path 123 on the PV diagram in Figure P12.66, 418 J of energy flows into the system by heat and -167 J of work is done on the gas. (a) What is the change in the internal energy of th...
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