Review Pt 1 - Problems - heat due to radiation. What is the...

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Physics 7B Midterm I Review Problems 1) Calculate the coefficient of density expansion for a material of volume coefficient of expansion β ; meaning ρ ρ 0(1 + γ∆ T), what is γ ? 2) A rod of cross-sectional area A and length l has its left end held at constant temperature T1 and its right end held at T2 < T1. If the conductivity varies with distance from the left end, x, according to the relationship k = x/R + k0 (R and k0 are positive), what is the steady-state heat flow, H, through the rod? 3) A black-body sphere of radius r, mass m, specific heat c and initial temperature T0 is losing
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Unformatted text preview: heat due to radiation. What is the temperature of the sphere as a function of time? Does the sphere ever reach absolute zero? 4) Use the ideal gas law to show that, for an ideal gas at constant pressure, the coefficient of volume expansion is equal to 1/T. 5) A helium balloon, assumed to be a perfect sphere, has a radius of 22.0 cm. At room temperature (20 o C), its internal pressure is 1.06 atm. Determine the number of moles of helium in the balloon, and the mass of helium needed to inflate the balloon to these values....
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