Question

2. A string tied to a rock is being twirled around Fred's head at 5 cycles/s. If the rock has a mass of 500 g and the string is 50 cm long, what is the tension in the string? 3. A string tied to a rock is being twirled counter clockwise around Julie's head at 5 cycles/s. If the rock has a mass of 500 g, and the 50 cm string is cut, what direction does the rock fly? Explain. 4. A road undergoes a 2.3 km turn to the North. If the road is to be rated for 100 km/hr, at what angle should the road be banked?

Answer 1

Angular velocity (w) = 5 cy/s w = 31.416 rad/s Tension = m r w^2 = centripetal force T = 0.5 times 0.5 times 31.416^2 T = 246.74 N Direction of �B� due to centrifugal force �B�