PracticeMidterm1

PracticeMidterm1 - Physics 1C, Summer 2011 (Session 1)...

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Physics 1C, Summer 2011 (Session 1) Practice Midterm 1 (50+5 points) Problem 1 (5+5 = 10 points) A mass m at the end of a spring vibrates with a frequency of 0.88 Hz; when an additional 1.25 kg mass is added to m, the frequency is 0.48 Hz. a. What is the value of m? b. What is the spring constant k? Problem 2 (4+4+4 = 12 points) A 0.650-kg mass vibrates according to the equation x = 0.25 sin (5.50t), where x is in meters and t is in seconds. a. What is the period of the oscillations? b. What is the kinetic energy when x is 10cm? c. What is the potential energy when x is 10cm? Problem 3 (5+5 = 10 points) Suppose you produce two sound waves from the same source: the first wave has a period of 0.500 ms, and the second wave has a period of 0.520 ms. When you stand 1 meter away from the source, the intensity of each wave by itself is 50 dB. a. What is the beat frequency caused by the two waves? b. Assuming each source emits sound isotropically (in all directions equally), what is the
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PracticeMidterm1 - Physics 1C, Summer 2011 (Session 1)...

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