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a) If the Sun's emissivity is E = 1.0, what total power does it radiate? Consider a disk witli the same radius as the Earth's (RE = 6.4 x 106 m) and the same distance to the Sun (r = 1.50 x 1011 m), that is oriented with its surface perpendicular to the direction of the Sun. For light with wavelengths that correspond to (visible) Sunlight, the disk's emissivity is Evis = 0.25.
b) What is the total power of Sunlight that is absorbed by the disk? The disk reradiates this power back to outer space as infrared light.
c) If the disk's emissivity for infrared light wavelengths is EIR = 1.0, what will the disk's temperature be?
A 6 m board of mass 7 kg is hinged at one end, with a 60 kg block nesting on the board 245 cm from the hings. A force ~F is applied vertically at the other end to lift of the board. Find the force exerted by the hinge
What is the magnitude of the electrostatic force the molecule exerts on it?
A Carnot engine is operated between two heat reservoirs at temperatures of 530K and 300K. What is the thermal efficiency of the engine
Two small spheres have a mass 9.0g and having an electric charge q are suspended by a length of 32cm. Find Electrical Charge in C, Conducting rod 21.0 cm bent into semicircle. Linear density -5.20 * 10^-8 C/m. Find Electrical Potenial at the center..
In January from Indiana, Andromeda is high in the sky at 6pm local time. (Note that local time is about 40 minutes later than Eastern Standard Time, because Indiana is on the far western end of the time zone. The sun is at its highest point in the..
A charged paint is spread in a very thin uniform layer over the surface of a plastic sphere of diameter 13.0 cm, giving it a charge of -17.0 microC. Find the electric field just inside the paint layer
A 2.30-kg object attached to a spring moves without friction (b = 0) and is driven by an external force given by the expression F = 3.50sin(2(3.14)t), Find the angular frequency of the driven system
What is the frequency of up and down oscillations of the wheel? Regard wheel as a mass on one end of a spring and regard the body of the car as a fixed support for the other end of the spring.
It was a dark and stormy night, when suddenly you saw a flash of lightning. how far away was the lightning bolt
You are given a galvanometer with a resistance of 17.3 ? and a full scale deflection current of 8.42 mA. Find the maximum current the ammeter is capable of reading
An isolated conducting sphere has a 13 cm radius. One wire carries a current of 1.0000048 A into it while another wire carries a current of 1 A out of it. How long in seconds would it take for the sphere to enhance in potential by 820 V.
A 23 bullet traveling 245 penetrates a 3.0 block of wood and emerges cleanly at 195 .If the block is stationary on a frictionless surface when hit, how fast does it move after the bullet emerges.
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