Question

The 20G Centrifuge of NASA at its Ames Research Center has a radius of 29 feet and can create an artificial gravity on a person in the device up to twenty times of the actual weight of the person. What is its spinning speed in term of revolutions per minute (rpm) when producing the maximum artificial gravity?

Answer #1

Radius = 29 feet = 8.84 m

A = v^2/r

v^2 = A * r

V^2 = 196 * 8.84

V = sqrt(1732) m/s

V = 41.62 m/s

Spinning speed in term of revolutions per minute = V * rpm

Distance travelled in 1 revolution = 2* pi * r

Distance travelled in 1 revolution = 2 * 3.14 * 8.84 = 55.5 m

Time taken for 1 revolution = 55.5 / 41.62 = 1.33 s

No of Revolution in 1 min = 60/1.33 = 45

**Spinning speed in term of revolutions per minute = 45
rpm**

At its Ames Research Center, NASA uses its large ā20-Gā
centrifuge to test the effects of very large accelerations
(hypergravity) on test pilots and astronauts. In this
device, an arm 8.84 m long rotates about one end in a horizontal
plane, and the astronaut is strapped in at the other end. Suppose
that he is aligned along the arm with his head at the outermost
end. The maximum sustained acceleration to which humans are
subjected in this machine is typically...

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minute) to 139.0 rpm? Give your answer in J.
Hint: The moment of inertia for a solid cylinder rotating about
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