Question

A concrete block is pulled 7.0 m across a frictionless surface by means of a rope. The tension in the rope is 40 N; and the net work done on the block is 247 J. What angle does the rope make with the horizontal?

Answer 1

Explanation:

W=F×d Sin a

putting given values in equation, we get:

247=40×7×Sin a

Sin a = 247/280

Sin a = 0.88214

a = Sin ^-1(0.88241)

a 61.9344°