An amusement park ride consists of a car moving in
a vertical circle on the end of a rigid boom of
negligible mass. The combined weight of the car
and riders is 5.0 kN, and the radius of the circle is
10 m. At the top of the circle, if the car’s speed is v
= 5.0 m/s, what are the (a) magnitude and (b)
the boom (call it B F

). Now instead the car is
moving with a speed v =12.0 m/s, what are (c) the
magnitude and (d) direction of B F