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An object has a weight of 500 on earth what is the mass of this object

What tightening torque should be used for a hexagonal head screw (not split-bolt) on a 250 kcmil conductor?

Aplayground merry-go-round has a radius of 4.6 m and a moment of inertia of 200 kg-m2 and turns with negligible friction about a vertical axle through its center. a child applies a 26.0 n force tangentially to the edge of the merry-go-round for 15.0 seconds. if the merry-go-round is initially at rest, how much work did the child do on the merry-go-round?