1 ) A shpooer in a supermarket pushes a cart with a force of 25 N directed at an angle of 18 downward from the horizontal . Find the work done by the shopper as she moves a 40 m lenght of the aisle ?
W = (35 N)(40) cos 25o
W = (35 N)(40.906)
W = 1 586 N-m =
W = F d cos 25
= 1 586 J
2 ) Tarzan swing on a 25 m long vine initially inclined at angle of 32 with the vertical . What is the speed at the bottom of the swings
a) if he start from rest ?
b) if he pusches off with speed of 5.00 m/s ?
a ) if he start from rest ? = zero