Astronauts use a centrifuge to simulate the acceleration of a rocket launch. the centrifuge takes 40.0 s to speed up from rest to its top speed of 1 rotation every 1.20 s . the astronaut is strapped into a seat 4.10 m from the axis.

astronauts are subject to an acceleration of 11.5g

Explanation:

To calculate centripetal acceleration, we must find the linear velocity of astronauts

     V = d / t

Let us use the revolution as distance and, in this case, the time is denominate  period

    V = 2π r / T

    V = 2π 4.1 / 1.2

    V = 21.5 m / s

The centripetal acceleration equation is

    a = v2 / r

    a = 21.52 / 4.1

    a = 112.4 m / s

The acceleration can be written based on the acceleration of gravity

   a2 = a / g

   a2 = 112.4 / 9.8

   a2 = 11.5g

It is said that astronauts are subject to an acceleration of 11.5g