(a) Find the speed of the sled and rider atpoint C . Enter anumber. 1 m/s (b) Mo

Question

(a) Find the speed of the sled and rider atpoint C.
Enter anumber. 1 m/s

(b) Model the force of water friction as a constant retarding forceacting on a particle. Find the work done by water friction instopping the sled and rider.
Enter anumber. 2 kJ

(c) Find the magnitude of the force the water exerts on thesled.
Enter anumber. 3 N

(d) Find the magnitude of the force the chute exerts on the sled atpoint B.
Enter anumber. 4 N

(e) At point C the chute is horizontal but curving in thevertical plane. Assume its radius of curvature is 20.0 m. Find theforce the chute exerts on the sled at point C.
Enter anumber. 5 N Enter anumber. Enter anumber. Enter anumber. Enter anumber. Enter anumber.

Explanation / Answer

This question has already been asked in another members post,but here is the answer that was given. (a)    first to get the result we use theconservation of energy for the sled-rider-earth syatem between Aand C so that we get    KEi + PEgi =KEf + PEgf    (1 / 2) m (2.5 m / s)2 + m (9.80m / s)2 (9.76 m) = (1 / 2) m vC2 +0    solve for the velocity vC    vC = ......... m / s (b)    for the entire motion between A and D weget    KEi + PEgi -fk x = KEf + PEgf    (1 / 2) (80 kg) (2.5 m / s)2+ (80 kg) (9.80 m / s2) (9.76 m) - fkx = 0 + 0    - fk x = - .......... J (c)    in the given problem the water exerts africtional force given by    fk = .......... J / 50 m        = ........ N    the normal force is    n = m g       = (80 kg) (9.80 m /s2)       = ......... N    so the magnitude of the water force will be    F = (fk2 +n2)       = ......... N (d)    the angle is given by        = sin-1(9.76 m / 54.3m)       =........o    for the forces perpendicular to the track at B weget         Fy = m ay    nB - m g cos = 0    nB = m g cos         = ........ N (e)    in this part     Fy = m ay    nC - m g = m vC2/ r    nC = ......... N up

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