(A) Every square meter area facing the Sun, at the distance 1 AU from the Sun, receives radiant power = 1.368 kW. Therefore, what is the total power radiated by the Sun? (B) Imagine a spacecraft at distance d from the Sun, which has a solar panel with area A and efficiency e. (I.e., the solar panel converts this fraction of incident sunlight to electric power.) How much electric power can the solar panel produce for the spacecraft?

(A) Every square meter area facing the Sun, at the distance 1 AU from the Sun, receives radiant power = 1.368 kW. Therefore, what is the total power radiated by the Sun? (B) Imagine a spacecraft at distance d from the Sun, which has a solar panel with area A and efficiency e. (I.e., the solar panel converts this fraction of incident sunlight to electric power.) How much electric power can the solar panel produce for the spacecraft?

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter1: Temperature And Heat

Section: Chapter Questions

Problem 128CP: As the very first rudiment of climatology, estimate the temperature of Earth. Assume it is a perfect...

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(a) Cherry-red embers in a fireplace are at 850ºC and have an exposed area of 0.200m2 and an emissivity of 0.980. The surrounding room has a temperature of 18.0ºC. 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?
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Final Answer must be a decimal or whole numbers only!!!
Problem 1.28. Estimate how long it should take to bring a cup of water to boiling temperature in a typical 600-watt microwave oven, assuming that all the energy ends up in the water. (Assume any reasonable initial temperature for the water.) Explain why no heat is involved in this process.
The power radiated by the Sun is 3.83 × 1026 W (The Watt is the SI unit of power, 1 W = 1 J s-1). Given that the power radiated by the Sun is the rate at which energy is radiated by the Sun per unit time, write down a formula relating the total energy radiated by the Sun, E, during a time interval T, and the radiated power, P. Use your formula and the information given above to calculate the total energy radiated by the Sun in exactly 4 hours. Give your answer to 3 significant figures and write it using scientific notation.
Many decisions are made on the basis of the payback period: the time it will take through savings to equal the capital cost of an investment. Acceptable payback times depend upon the business or philosophy one has. For some industries, a payback period is as small as 2 yeas) Suppose you wish to install the extra insulation in the preceding problem. If energy cost $1.00 per million joules and the insulation was $4.00 per square meter, then calculate the simple payback time. Take the average T for the 120-day heating season to be 15.0 .