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College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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An electric kettle uses 240 000 J of input energy and produces only 190 000 J of useful energy. Calculate the percent efficiency of this electric kettle.
% efficiency = ________ X 100 %
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- An engine does 3250 J of work and discards 5750 J of heat. Find the efficiency of this engine. Show the solution. Answer: E = 36.1% Max efficiency = 36.1% Actual efficiency = 37%arrow_forwardSuppose you spend 30.0 minutes on a stair-climbing machine, climbing at a rate of 65 steps per minute, with each step 8.00 inches high. If you weigh 150 lb and the machine reports that 750 kcal have been burned at the end of the workout, what efficiency is the machine using in obtaining this result? %If your actual efficiency is 0.19, how many kcal did you really burn? kcalarrow_forwardIn Arizona, photovoltaic (PV) panels can generate an average annual power of 1 MW/acre. If there are 311 sunny days per year in Arizona, but only 160 sunny days per year in Pennsylvania, how much average power (in MW/acre) could the same PV panels generate in Pennsylvania? Please include two decimal places in your answer. Note: assume that a cloudy day delivers 0 watts/acre of solar power. This is not true, but it simplifies the problem for us.arrow_forward
- An engine has a hot reservoir of 520K and a low-temperature reservoir of 330K. What is the theoretical efficiency of this engine? Answer in units of %arrow_forwardA 2.0 m2 solar panel is fully illuminated by sunlight. Assume the sunlight has a power density of 0.10 J/cm2 -s. a) If the efficiency of the solar panel is 16%, how much electrical energy will it deliver in one hour? b) If this energy is stored in a battery, how long will it keep a 100 W incandescent lightbulb burning if the bulb has an efficiency of 2.6%. (Efficiency of the lightbulb is the light out - - 100 W - to the electrical power in.)arrow_forwardA power plant operates at a 25.0% efficiency during the summer when the seawater used for cooling is at 20.0°C. The plant uses 360°C steam to drive turbines. If the plant's efficiency changes in the same proportion as the ideal efficiency, what would be the plant's efficiency in the winter, when the seawater is at 10.1°C? ______ %arrow_forward
- An engine has a hot-reservoir temperature of 980 K and a cold-reservoir temperature of 550 K. The engine operates at three-fifths maximum efficiency. What is the efficiency of the engine?arrow_forwardA heat engine operates between a reservoir at 27°C and one at 374°C. What is the maximum efficiency possible for this engine?arrow_forwardHow much energy in jouls does a (5.14x10^1) W toaster use in the morning if it is in operation for a total (4.000x10^0) min? Give your answer to 3 sf. Note: Your answer is assumed to be reduced to the highest power possible. Your Answer: x10 Answerarrow_forward
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