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A ball on a string moves in a vertical circle. When the ball is at its lowest point, the tension in the string is equal to the ball's weight. (i said true..?)

A small projectile is launched horizontally 1 m above the surface of a smooth, airless planet, with sufficient speed for orbit. A bus riding in a small hole in the projectile feels an apperant weight greater than its true weight (I said false)

All points on a rotating wheel have the same angular acceleration (I said true)

could someone please correct me if i'm wrong? one or more of these are wrong...

  • PHYSICS - ,

    Not true. The ball's weight is mg + m*v^2/r

    IF the projectile is in orbit, yes, false.

    last is true.

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