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Hwk8A

Hwk8A - PHYS 153 Homework 8A Problem 1 The earth's...

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PHYS 153 Homework 8A Problem 1 The earth’s free-fall acceleration varies from 9 . 78 m / s 2 at the equator to 9 . 83 m / s 2 at the poles, both because the earth is rotating and it’s not a perfect sphere. A pendulum whose length is precisely 1 . 000 m can be used to measure g . Such a device is called a gravimeter . (a) How long do 100 oscillations take at the equator? (b) How long do 100 oscillations take at the north pole? (c) Is the diﬀerence between your answers to parts (a) and (b) measurable? What kind of instrument could you use to measure the diﬀerence? (d) Suppose you take your gravimeter to the top of a high mountain peak near the equator. There you ﬁnd that 100 oscillations take 201 . 0 s. What is g on the mountain top? Problem 2 A 200 g block hangs from a spring with spring constant 10 N / m. at t = 0 s the block is 20 cm below the equilibrium point and moving upward with a speed of 100 cm / s. What are the block’s (a) Oscillation frequency? (b)

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Hwk8A - PHYS 153 Homework 8A Problem 1 The earth's...

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