phys213 spring08 homeworkb 01

# phys213 spring08 homeworkb 01 - phys213/spring08 homeworkb...

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phys213/spring08 homeworkb 01 https://online-s.physics.uiuc.edu/cgi/courses/shell/phys213/spring08/hwb. .. 1 of 2 4/26/2008 12:55 PM HomeworkB 01 (5 questions) CLOSED -- changes no longer allowed. The deadline for storing your answers was 0800 on 03/11/2008. An iron block of mass m = 500 g is dropped from a height h = 20 meters above another iron block of mass M = 1 kg. The bottom block sits on the floor, but it is thermally isolated from the floor. Iron ( Fe ) has an atomic weight of 56 g/mole. (You can find all atomic weights in the Periodic Table ) Initially, the two blocks have a temperature T i = 27 o C. Use g = 9.81 m/sec 2 and 0 o C = 273 K 1) Assume that the kinetic energy of the falling block is transformed entirely into internal thermal energy when the falling block stops. What is the change in the internal energy, ΔU, of the system? ΔU = X 98.1 J 294.3 J 55674.1 J 66808.9 J 200426.8 J The answer you chose (the one marked with an X ) is the correct answer . 2)

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phys213 spring08 homeworkb 01 - phys213/spring08 homeworkb...

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