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assign42k6 - with boiling water(at atmospheric pressure at...

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Physics 153 Assignment 4 Due Friday October 6, 2006 by 5:30pm 1. What is the rate of energy radiation per unit area of a blackbody at a temperature of (a) 279 K (b) 2790K ? 2. The hot glowing surfaces of stars emit energy in the form of electromagnetic radiation. It is a good approximation to assume star are perfect black bodies. Rigel, the bright blue star in the constellation Orion emits the brightest light at a wavelength of λ = 237 . 5 nm and radiates energy at a rate of 2 . 7 × 10 32 W . Find the radius of the star Rigel. 3. A crate of fruit with mass 35.0 kg and specific heat capacity 3650 J/kg K slides down a ramp inclined at 36 . 8 below the horizontal. The ramp is 8.00 m long. (a) If the crate was at rest at the top of the incline and has a speed of 2.50 m/s at the bottom, how much work was done on the crate by friction? (b) If an amount of heat equal to the magnitude of the work done by friction goes into the crate of fruit and the fruit reaches a uniform final temperature, what is its temperature change? 4. A long rod, insulated to prevent heat loss along its sides, is in perfect thermal contact
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Unformatted text preview: with boiling water (at atmospheric pressure) at one end and with an ice-water mixture at the other. The rod consists of 1.00m section of copper (one end in steam) joined end-to-end to a length L 2 of steel (one end in ice). Both sections of the rod have cross-section areas of 4 . 00 cm 2 . The temperature of the copper-steel junction is 65 . ◦ C after a steady state has been set up. (a) How much heat per second flows from the steam bath to the ice-water mixture? (b) What is the length L 2 of the steel section? 5. An ideal monatomic gas with initial volume V 1 = 3 . 50 cm 3 and T 1 = 360 K follows the cycle given. (a) How much work is done by the gas from 1 to 2? (b) How much work is done by the gas from 3 to 4? (c) How much work is done going clockwise around the cycle once. (d) How much heat is added to the system during one cycle? 350 100 V 2V 1 1 P V 1 3 4 isothermal (kPa) (cm ) 3 2 1...
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