In order to train for a high-g environment,an astronaut is placed in a centrifuge of radius several meters and rotated in a horizontal circle at constant speed.In this situation,in which direction is the net force on the astronaut?
A)The net force is down since gravity cannot be turned off.
B)The net force is horizontal toward the center of the circle.
C)The net force is between horizontal toward the center of the circle and straight up,the angle depending on the speed and the radius involved.
D)The net force is zero since the astronaut is moving at constant speed and thus the force has no direction.

Question

Quizplus · Accepted Answer

The net force on the astronaut is the centripetal force which acts towards the center of the circle (horizontal direction). This force is required to maintain the astronaut in circular motion. The force due to gravity is still present but it is balanced by the normal force acting in the opposite direction. Therefore, the net force is horizontal towards the center of the circle.

In Order to Train for a High-G Environment,an Astronaut Is