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Sp05-MT1-Liphardt-Exam

Sp05-MT1-Liphardt-Exam - UNIVERSITY OF CALIFORNIA BERKELEY...

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UNIVERSITY OF CALIFORNIA, BERKELEY Physics Department 7b, Liphardt Spring Term 2005 Exam #1 Name __________________________ Disc. Section ____________________ SID ____________________________ #1______ #2______ #3______ #4______ Total________ The relative weight of each problem is indicated next to the problem number. Most credit will be given for algebraic work. Please do not insert numerical values until you have a final algebraic answer inside a box. If you don’t know a particular constant, use a symbol to get partial credit. It is almost impossible to award partial credit if you insert numbers too early. If you get stuck on one problem, go on to the next and come back to the difficulties later in the exam period. Do not leave early until you have completed everything. Do not quit! Never, never, never quit!! As usual, before you start to manipulate equations and numbers you should think for a moment and make sure that you have a general sense of the important features of a problem. Also, once you have computed something, check to see if your answer has the right units, and if it is in the right ballpark. For example, if your answer to any problem is something like ± x 10 418 Kelvin/meters, you should check your work. Finally, please do not violate the first and second laws! Mw of Water = 18 g/mol k B = 1.38 x 10 -23 J/K N A = 6 x 10 23 Acceleration due to gravity: a = 9.8 m/s 2 .
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Problem 1 (50 points) Ice, water, and a block of iron. Unless otherwise specified, everything is done very slowly. A cylinder with radius r = 10 cm is filled with ice to a height z of 20 cm. The density of the ice is 0.92 g/cm 3 . a) Place a block of iron (mass = 10 kg) on the ice. What is the force exerted on the ice by the iron block, due to gravity? b) The ice is initially at a temperature of -30 C. Now heat the ice from -30 C to -10 C.
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