QUESTION 5 A block of mass m is initially at rest on a horizontal surface. A horizontal force F is applied, just enough to get the block started. Once the block is in motion, the same force (F) is applied. The coefficients of static and kinetic friction between the block and the surface are Us and uk, respectively. The acceleration of the block is: O F/m OF-Pk mg O F/m - Hs 9 O (Hs - Hk) g g (Hs + Hk)/2 O Hk 9 cave all answers.

x Incorrect The force P is applied to the 30-kg block when it is at rest. Determine the magnitude and direction of the friction force exerted by the surface on the block if (a) P = 0, (b) P = 85 N, and (c) P = 131 N. (d) What value of P is required to initiate motion up the incline? The static and kinetic coefficients of friction between the block and the incline are us = 0.18 and µk = 0.12, respectively. The friction force is positive if up the incline, negative if down the incline. %3D P 30 kg 18° H, = 0.18 H = 0.12 12 Answers: (а) F 3D N (b) F (c) F = (d) P =

At a time when mining asteroids has become feasible, astronauts have connected a line between their 3360-kg space tug and a 5770- kg asteroid. They pull on the asteroid with a force of 380 N. Initially the tug and the asteroid are at rest, 356 m apart. How much time does it take for the ship and the asteroid to meet? Number Units aT ap

pls help not in scientific notation pls

1O C A cart for hauling ore out of a gold mine has a mass of 439 kg , including its load. The cart runs along a straight stretch of B Track track that climbs a shallow 4.75° incline. A donkey, which is Rope trudging along and to the side of the track, has the unenviable job of pulling the cart up the slope with a 441 N force for a distance of 185 m by means of a rope that is parallel to the slope but makes an angle of 14.5° with the track. A „Track incline Model the rolling resistance of the cart as though it were Horizontal ground sliding on the track with a coefficient of friction of 0.0163. Use g = 9.81 m/s, and note that angle A in the image is the angle of the incline while angle B is the angle the rope makes %3D with the track. Find the work Wa that the donkey performs on the cart during this process. %3D Find the work W, that the force of gravity performs on the cart during this process. = "M Calculate the work W done on the cart by friction during this process. 87

A skater of mass m standing on ice throws a stone of mass M with speed v in a horizontal direction. Find the distance over which the skater will move in the opposite direction if the coefficient of kinetic friction between the skater and the ice is  ?k . (Use any variable or symbol stated above along with the following as necessary: g.)Δx =