posted by madeline .
A block is hung by a string from the inside roof of a van. When the van goes straight ahead at a speed of 32 m/s, the block hangs vertically down. But when the van maintains this same speed around an unbanked curve (radius = 140 m), the block swings toward the outside of the curve. Then the string makes an angle θ with the vertical. Find θ.
The vertical component of string tension, T sinè, equals the weight, M g.
The horizontal component of string tension, T cosè, is the centripetal force, m V^2/R.
Note that the horizontal/vertical force ratio is tan è
V^2/(Rg) = tan è
Solve for è