2007-11-15
Today's nonsense
- Lil' Jibble the Hip-Hop Funky-Fresh Integration Turtle
ex 3) Two children are pulled on a sled over snow. The sled, initially at rest, is pulled by a rope that makes a 40 degree angle with the horizontal. The children's combined mass is 45 kg and the sled's mass is 5 kg Mu_s = 0.2 and Mu_k = 0.15.Find the frictional force exerted by the ground on the sled and the acceleration of the children and sled, starting from rest, if the tension in the rope is (a) 100 N and (b) 140 N.
Is the frictional force static or kinetic?
