# Physics Gravity

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A projected space station consists of a circular tube that will rotate about its center (like a tubular bicycle tire) as shown in the figure . The circle formed by the tube has a diameter of about 1.1-km

What must be the rotation speed (revolutions per day) if an effect equal to gravity at the surface of the Earth (1.0-g is to be felt?

Please help. I do not even know where to start.

• Physics Gravity -

g = R w^2 = 9,8 m/s^2
R = 550 m

Solve for the angular velocity w in radians/second
Then convert that to revolutions per day.

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