physics help!!! Ok here's the question: A block is hung by a string from the inside roof of a van. When the van goes straight ahead at a speed of 28m/s, the block hangs verticaly down. But when the van maintains this same speed around an unbanked curve of radius 150m, the block swings toward the outside of the curve. Then the string makes an angle( theta) with the vertical. Find (theta) Any suggestions? I can't seem to get anything out of this. The radii's are alwaays 150, pythagoras doesn't work. THe velocities are uniform, again pythagoras can't work. Maybe centripetal force? I can't use the banked curve formula, it's not banked! Thanks, Brian.