WAEC - Physics (1989 - No. 7)
A stone tied to a string is made to revolve in a horizontal circle of radius 4m with an angular speed of 2 rad per sec. With what tangential velocity will the stone move off the circle if the string is cut?
16.0 ms-1
8.0 ms-1
6.0 ms-1
2.0 ms-1
0.5 ms-1
Giải thích
V = wr = 2x4 = 8.0 ms-1