Answer:
40.3 ft-lbs
Explanation:
Work = Force•Distance = (Force)(Distance)(cosΘ)
Note what you know and/or don't know. In this case:
Force = 8lbs
Distance = 7ft
Θ = 44°
So with that and the formula of work above, we can say:
Work = (8lbs)(7ft)(cos44°) = 40.28...ft-lbs
When rounded you have 40.3 ft-lbs of work done by the force.
Side note: Just to be clear, the formula Force•Distance is said as Force "dot" Distance. It's a dot product and not just a multiplication sign; which is why the angle is important to know.
Force×Distance is said as Force "cross" Distance, which relates to a different kind of force and has a slightly different formula.
