Q. A small box is held in place against a rough vertical wall by someone pushing on it with a force directed upward at 27{rm ^circ} above the horizontal. The coefficients of static and kinetic friction between the box and wall are 0.40 and 0.30, respectively. The box slides down unless the applied force has magnitude 33 {rm N}.What is the mass of box?
Q. A woman rides a carnival Ferris wheel at radius 15 m, completing 5 turns about its horizontal axis every minute. What are (a) the period of the motion, and the magnitude of her centripetal acceleration at (b) the highest point and (c) the lowest point?