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    Please help: Normal force for box on an inclined plane = mg/cos(theta)?

    Homework Statement A box sits on an inclined plane. Given its mass and the angle of the incline, what is the magnitude of the normal force? Homework Equations I don't know- my understanding is N=mgcos(theta), but my physics textbook says otherwise... The Attempt at a Solution My attempt at...
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    A man jumps off a swingset (Help Please!)

    Homework Statement A man jumps off a swingset at the peak of his swing (45 degrees from swing's base, which is perpendicular to the ground). The length of the swing chain is 2.13 meters, the distance from the pivot (where the chain attaches to the base) to the ground is 2.53 meters. What is...
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