mt2soln_08 - Physics 9B-C Midterm 2 Solutions...

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Midterm 2 solutions, 11/21/08 Page 1 of 2 Phy 9B UC Davis Heat flow a b r ƒ ƒ A ƒ ƒ ƒ ƒ A cos ƒ A T A A A A A A A cos ƒ Physics 9B-C Midterm 2 Solutions Cole [1] a) remain the same b) True c) mass d) decrease e) all of the above f) white g) 0 h) False i) rise j) decrease. [2] a) ( 10 pts) From the diagram A T = A + 2 A cos φ so I A T 2 = A 2 1 + 2cos φ ( ) 2 where I 3 A ( ) 2 = 9 A 2 . Thus, I I = A 2 1 + 2cos φ ( ) 2 9 A 2 õ I = I 1 + 2cos φ ( ) 2 9 b) ( 5 pts) The first secondary maximum occurs midway between the minima which are at φ = 2 π 3 and 4 π 3 . The first secondary max occurs at ƒ = π
 . The phasor diagram is: c) (5 pts) leaving a total amplitude of A. I I = A 2 9 A 2 õ I = 1 9 I . [3] The water starts out with gravitational potential energy which gets converted into heat. Taking a small arbitrary mass m of the water. mgh = Q Use the specific heat of water to find the change in temperature. mgh = mcÎT õ Δ T = gh c = 9.8 m/s 2 ( ) 800 m ( ) 4200 J kg·K = 1.87° C.
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