posted by Anonymous on .
A horizontal force of 804 N is needed to drag a crate across a horizontal floor with a constant speed. You drag the crate using a rope held at an angle of 32° (from the horizontal).
(a) What force do you exert on the rope?
(b) How much work do you do on the crate if you move it 22 m?
(c) If you complete the job in 8.0 s, what power is developed?
a. Fe*cos32 = 804 N.
Fe = 804 / cos32 = 948 N. = Force exerted.
b. W = Fe * d = 948 * 22 = 20,856 J.
c. P = W / t = 20,656 / 8 s. = 2607 J/s
= 2607 Watts = 2.607 KW.