Question

A 5000-lb wrecking ball hangs from a 30-ft cable of density 7 lb/ft attached to a crane. Calculate the work done if the crane lifts the ball from ground level to 30 ft in the air by drawing in the cable.

Answer 1

Answer:

W = 1094100 [lb*ft]

Explanation:

We recall the definition of work which says that work is equal to the product of force by distance. We have the weight data of the ball and cable.

30[ft] * 7[lb/ft] = 210 [lb]

the force combined will be:

F = 210 + 5000 = 5210[lb]

W = 5210 * 30 = 1094100 [lb*ft]