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..?)

Question

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...

Answer 1

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

IF the projectile is in orbit, yes, false.

last is true.