Question
A stone of mass 0.3 kg attached to a 1.5 m long string is whirled around in a horizontal circle at a speed of 6 m s-1 The tension in the string is
10 N
20 N
7.2 N
30 N
Solution
C.
7.2 N
Here, mass of the stone m = 0.3 kg
Length of a string = 1.5 m
Speed v = 6 m/s
T =
Where R is the length of the string.
=
T = 7.2 N
