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Q. Gillian buys a pendulum clock at a discount store and discovers when she gets it home that it loses 6.00 minutes each day.
a) Should she lengthen or shorten the pendulum in order for it to keep accurate time?
b) If the pendulum has a period of 2.00 s, by how much must the length be changed so that the clock keeps accurate time?
A 120 kg mail bag hangs by a vertical rope 4.00 m long. A postal worker then displaces the bag to a position 2.10 m sideways from its original position, always keeping the rope taut.
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A copper telephone wire has essentially no sag between poles 20.5 meters apart on a winter day while the temperature is -15.5° C. How much longer is the wire on the summer day when the temperature is 27.0° C.
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