A block is hung by a string from the inside roof of a van.
When the van goes straight ahead at a speed of 24 m/s, the block hangs vertically down.
But when the van maintains this same speed around an unbanked curve (radius = 180 m),
the block swings toward the outside of the curve.
Then the string makes an angle with the vertical.
Find the angle theta.
not sure if this has to do with a lifting force or not. and if there is an equation for this problem.