1.

A pendulum has a string of length 99.39 cm. how much length of the pendulum must be shortened to keep the current time of the pendulum if it loses 4 s a day?A. 0.0009 cmB. 0.009 cmC. 0.09 cmD. 0.9 cm

Answer» Correct Answer - B
Time lost by pendulum per day=4s, dn=-4s number of seconds in a day, n=`24xx3600s`
Let dl be the length by which the pendulum should be shortened to keep the correct time
`(dn)/(n)=-(dl)/(2l)implies(-4)/(24xx3600)=(-dl)/(2xx99.39)`
`impliesdl=0.00920cm`


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