College Physics
1st Edition
ISBN: 9781938168000
Author: Paul Peter Urone, Roger Hinrichs
Publisher: OpenStax College
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- (a) Cherry-red embers in a fireplace are at 850C and have an exposed area of 0.200m2 and an emissivity of 0.980. The surrounding room has a temperature of 18.0C. If 50% of the radiant energy enters the room, what is the net rate of radiant heat transfer in kilowatts? (b) Does your answer support the contention that most of the heat transfer into a room by a fireplace comes from infrared radiation?arrow_forwardThe evaporation of perspiration is the primary mechanism for cooling the human body. Estimate the amount of water you will lose when you bake in the sun on the beach for an hour. Use a value of 1 000 W/m2 for the intensity of sun-light and note that the energy required to evaporate a liquid at a particular temperature is approximately equal to the sum of the energy required to raise its temperature to the boiling point and the latent heat of vaporization (determined at the boiling point).arrow_forwardIntegrated Concepts (a) Calculate the rate in watts at which heat transfer through radiation occurs (almost entirely in the infrared] from 1.0 m2of the Earth’s surface at night. Assume the emissivity is 0.90, the temperature of the Earth is 15°C, and that of outer space is 2.7 K. (b) Compare the intensity at this radiation with that coming to the Earth from the Sun during the day, which averages about 800 W/m2, only hall of which is absorbed. (c) What is the maximum magnetic field strength in the outgoing radiation, assuming it is a continuous wave?arrow_forward
- (a) Where can lightning take place? (Where can it begin and end?) (b) Describe what is meant by heat lightning and a bolt from the blue.arrow_forwardPart A A 5.00-m-diameter garden pond is 0.400 m deep. Solar energy is incident on the pond at an average rate of 400 W/m?. If the water absorbs all the solar energy and does not exchange energy with its surroundings, how many hours will it take to warm from 16.0°C to 28.0°C ? ? 13.53 hours Submit Previous Answers Request Answer X Incorrect; Try Again; 5 attempts remaining Review your calculations and make sure you round to 3 significant figures in the last step.arrow_forwardTwo stars, A and B, have the same emissivity, but the radii and surface temperatures are different with RA = 0.5RB, and TA = 2TB. Assuming the temperature of space to be negligible, which star radiates the most energy per unit time? a. Star Ab. Star Bc. Both radiate the same amount of energy per unit time.d. More information is needed in order to make a determination.arrow_forward
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