# lee8 - Course 124, Answers to the Final Exam 2009 1. If you...

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(b) 280 km (c) 510 km (d) 790 km (e) 1200 km 23 / 2 2 2/3 11 2 2 24 6 1 22 3600 / 24 / 6.67 10 6 10 6.76 10 2 2 15.65 mv Mm GM r r Gv T rr r v GM s h h day N m kg kg TGM r m day ππ −− == = = ⎛⎞ ×⋅ × ⎜⎟ = × ⎝⎠ The height above the surface of the Earth: 66 5 6.76 10 6.38 10 3.77 10 377 rm mm k m Δ= = = 4. The reason an astronaut in an earth satellite feels weightless is that (a) the astronaut is at a point in space where the effects of the moon's gravity and the earth's gravity cancel. (b) this is a psychological effect associated with rapid motion. (c) the astronaut is falling. (d) the astronaut's acceleration is zero. (e) the astronaut is beyond the range of the earth's gravity. 5. Two train whistles, A and B , each have a frequency of 392 Hz. A is stationary and B is moving toward the right (away from A ) at a speed of 35 m/s. A listener is between the two whistles. No wind is blowing. Take the speed of sound to be 344 m/s. What is the beat frequency detected by the listener? (a) 3.6 Hz (b) 12 Hz (c) 36 Hz (d) 196 Hz (e) 392 Hz
10 392 f fH z == 20 344 / 392 356 344 / 35 / S cm s f z H z cV ms = ++ 392 356 36 beat f Hz Hz Hz =−= 6. A block attached to a spring executes simple harmonic motion on a frictionless horizontal surface. At time t = 0 s, the block has a displacement of -0.50 m, a velocity of - 0.80 m/s, and an acceleration of +3.8 m/s 2 . The amplitude of the motion is closest to: (a) 3.8 m (b) 0.58 m (c) 0.88 m (d) 0.80 m (e) 0.72 m ( ) 0 cos 0.5 A m ϕ =−

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## This note was uploaded on 03/02/2012 for the course PHYSICS 124 taught by Professor Madey during the Spring '08 term at Rutgers.

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lee8 - Course 124, Answers to the Final Exam 2009 1. If you...

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