Question

Tom and Joe are trying to fly a new style of kite that they have invented. Both of them are holding strings attached to the kite. The tension in each string is 126 N. The angle between the strings is 36°. Unfortunately, the kite will not rise in the air, and the strings held by Tom and Joe are essentially parallel to the ground. Tom and Joe have run a distance of 100 m trying to get the kite to fly. How much work have they done on the kite? Select one: a. 24,000 N • m b. 12,000 N • m c. 10,200 N • m d. 20,400 N • m

Answer 1

Net force on the kier, F = -2T cos 18 degree work done, W = F*s = 2Tcos18 degree*s = 2*126*cos18 degree * 100 = 24000 N.m