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A community plans to build a facility to convert solar radiation to electrical power. They require 3.00 MW of power, and the system to be installed has an efficiency of 30.0% (that is, 30.0% of the solar energy incident on the surface is converted to useful energy that can power the community). What must be the effective area of a perfectly absorbing surface utilized in such an installation, assuming sunlight has a constant intensity of 1120W/m2?
As astronauts travel between the Earth and the moon, their mass remains constant, but their weight diminishes. Determine the minimum weight an astronaut would have
Water flowing through a pipe suddenly comes to a section of pipe where the pipe diameter decreases to 86% of its previous value. what is its speed in this smaller section
a 38 g bullet strikes a 0.65 kg block attached to a fixed horizontal spring whose spring constant is 6.2 x 103 nm and
A 3.9 kg block originally at rest is pulled to the right along a horizontal, frictionless surface by a constant, horizontal force of 18 N.
X-rays having an energy of 250 keV undergo Compton scattering from a target. Find the Compton shift at this angle
A jackhammer causes a sound intensity of 95 bB at a point where a person is standing. What is the sound intensity level at the position of the listener
A light source of original intensity I0 passes through two coaxial circular polarizers. What is the average intensity of the light passing through both polarizers
A ball rolls across a floor with an acceleration of 0.100 m/s2 in a direction opposite to its velocity. What was the initial speed of the ball
During a violent storm, a car is struck by a failing high-voltage wire that puts an excess charge of -850 mircoC on the metal car. a) how much of this charge is on the inner surface of the car? b) how much is on the outer surface of the car?
A 0.48 kg piece of wood floats in water but is found to sinkin alcohol (specific gravity= 0.79) in which it has an apparentmass 0.035 kg. What is the SG of the wood
a beam of 800 kev gamma is mormally incident on a sheet of lead 12mm thick. the rate of energy transmission is 3x105
a wire 3.00 m long and 0.450 mm2 in cross-sectional area has a resistance of 39 at 20degc. if its resistance increases
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