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 pendulum has a string of length 99.39 cm. how much length of the pen

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?
Answer» 0.0009 cm 0.009 cm 0.09 cm 0.9 cm Solution :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`