posted by cadi .
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...
Not true. The ball's weight is mg + m*v^2/r
IF the projectile is in orbit, yes, false.
last is true.