Answered: 4. In order to load the refrigerator…

4. In order to load the refrigerator into the back of a truck 4m off the ground, an 8m long ramp is used (instead of lifting it). What is the efficiency of the ramp? L

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter4: The Second Law Of Thermodynamics

Section: Chapter Questions

Problem 2CQ: Explain in practical terms why efficiency is defined as

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Instantaneous Power

Power is defined in physics as the amount of energy transmitted or transformed per unit time. The watt is the unit of electricity in the International System of Units, equivalent to one joule per second.

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2 A 70 kg hiker climbed a mountain 1000 m high. He reached the peak in 3 hr. fa) Calculate the external work done by the climber. (b) Assuming the work was done at a steady rate during the 3 hr period, calculate the power generated during the climb. (c) Assuming the average O, consumption during the climb was 2 liters/min (corresponding to 9 6 kcal/min), find the efficiency'of the hiker's body. (d) How'much energy appeared as heat in the body?
A freezer has a coefficient of performance of 6.30. The freezer is advertised as using 495 kW-h/y. Note: One kilowatt-hour (kW-h) is an amount of energy equal to operating a 1-kW appliance for one hour. (a) On average, how much energy does the freezer use in a single day? 1.356 Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. J (b) On average, how much thermal energy is removed from the freezer each day? 0.215 Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. J (c) What maximum amount of water at 21.0°C could the freezer freeze in a single day? (The latent heat of fusion of water is 3.33 x 105 J/kg, and the specific heat of water is 4186 J/kg . K.) kg