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A radiation detector having a sensitive area of Ad=4×10^(-6) m^2 is configured to receive radiation from a target area of diameter Dt=40 mm when located a distance of Lt=1 m from the target. For the experimental apparatus shown in the sketch, we wish to determine the emitted radiation from a hot sample of diameter Ds=20 mm. The temperature of the aluminum sample is Ts=700 K and its emissivity is es=0.1. A ring-shaped cold shield is provided to minimize the effect of radiation from outside the sample area, but within the target area. The sample and the shield are diffuse emitters. Assuming the shield is black, at what temperature, Tsh, should the shield be maintained so that its emitted radiation is 1% of the total radiant power received by the detector?
a piston-cylinder device initially contains 50 l of liquid water at 40 degrees c and 200 kpa. heat is transferred to
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Consider just the vertical (y) response of the system when the beam is being stretched. Show that the spring constant, ka, is approximately 70.6 mN/m. What is the steady state amplitude of the vertical response? See Figure A below for an engine..
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