How many revolutions per minute must a circular, rotating space station of radius 1000 m rotate to produce an artificial gravity of 9.80 m/s²?
0.75 rpm.
0.95 rpm.
0.85 rpm.
0.65 rpm.
A stone, of mass m, is attached to a strong string and whirled in a vertical circle of radius r. At the exact bottom of the path the tension in the string is 3 times the stone's weight. The stone's speed at this point is given by
(gr)1/2.
(2gr)1/2.
2gr.
2(gr)1/2.
