The collar of mass m is released from rest while in position a and subsequently travels with negligible friction along the vertical-plane circular guide. determine the magnitude of the normal force exerted by the guide on the collar (a) just before the collar passes point b, (b) just after the collar passes point b (i. e., the collar is now on the curved portion of the guide), (c) as the collar passes point c, and (d) just before the collar passes point d. use the values m = 0.6 kg, r = 2.1 m, and k = 225 n/m. the unstretched length of the spring is 0.59r.

A33.1 g copper object is launched from a 1.5 m 30° steel incline positioned on the floor by being pulled up a string attached to a 50.0 g mass suspended vertically over a pulley. the object is projected towards a glass table where it lands when it is at the point along its trajectory with the lowest speed. it comes to a halt when it clears the opposite edge of the table. it then falls and lands on 9 physics texts each 5 cm thick that are stacked on the floor on the opposite side of the table. assume that the table does not have a ledge and the rectangular object experiences 0.05 n of air resistance as it falls towards the books. how far and how long did the object travel and how fast does it hit the books. assume that at the moment the copper object leaves the incline, the massless string and ideal pulley break off

In the sport of parasailing, a person is attached to a rope being pulled by a boat while hanging from a parachute-like sail. a rider is towed at a constant speed by a rope that is at an angle of 15 ∘ from horizontal. the tension in the rope is 1900 n. the force of the sail on the rider is 30∘ from horizontal. what is the weight of the rider? express your answer with the appropriate units.

Ais useful when you need a simple machine to you separate two things. a. lever b. screw c. pulley d. wedge