Question

an object of 0.5 kg is whirled at the end of string 0.8m long if the string makes three revolution in 1.2 second find tension in the string

Answer 1

we have w=(2.5)πrad/s(3/1.2)
also, Tension must balance the centrifugal force.
So, T=mw²r=0.5×(6.25)×π²×0.8=24.67N.