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    Acceleration of gravity on an unknown planet.

    Homework Statement A 92 kg man weighs 189 Newtons on the surface of an unknown planet. What ist he acceleration of gravity on this planet? Basically, I thought the formula to finding the gravitational force was G(gm)/r^2, but I'm missing the distance that the man from the planets center...
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    Spring Scale, the force will the scale read?

    Homework Statement A 3.0 kg object rotates on a circular platform 1.5 m from the center. The tangential velocity of the object is 10.0 m/s. If the mass is attached to a spring scale, what force will the scale read? Homework Equations Sorry I have no idea. The Attempt at a Solution...