A person pulls a toboggan for a distance of 30.0 m along the snow with a rope directed 15.0° above the snow. The tension in the rope is 70.0 N.
(a) How much work is done on the toboggan by the tension force?
(b) How much work is done if the same tension is directed parallel to the snow?
2006-10-23 01:49:23 · 2 answers · asked by Alan l 1 in Education & Reference ➔ Homework Help
work done = force applied x distance moved
in the first case i assume you mean that the angle the rope makes with the horizontal is 15 degrees.
then the force applied in the direction of motion becomes
70 N x cos 15 and this when multiplied by 30 metres will give you the work done.
in the second case since the tension is parallel to the snow the force is applied in the direction of the movement so
work = 70 N x 30 metres = 2100 Nm = 2100 Joules
2006-10-23 02:52:25 · answer #1 · answered by jazideol 3 · 0⤊ 0⤋
Bogus question.
Snow that delivers resistance of (about) 70 N?
What's on that thing?
a) If it is 70.0 N it is 70.0 N.
b) Get Pythagoras out of the closet for this one.
2006-10-23 09:43:26 · answer #2 · answered by Puppy Zwolle 7 · 0⤊ 0⤋