1. a first class lever in statistics equilibrium has a 75 ib resistance force and a 20 ib effort force. the lever's effort force is located 5.2 ft from the fulcrum. what's the actual mechanical advantage of the system?

2. using static equilibrium calculations, calculate the length from the fulcrum to the resistance force.

1. 3.75

2. 1.39 ft

Explanation:

The mechanical advantage is the ratio of the resistance force to the effort force.

MA = 75 lb / 20 lb

MA = 3.75

The sum of the torques about the fulcrum equals zero.

∑τ = Iα

(20 lb) (5.2 ft) − (75 lb) x = 0

x = 1.39 ft

Round as needed.

i think i backed my dad

a true.

unlike the threaded fasteners which are used to clamp the machine members, power screws are used to transmit power. common applications of power screws are: screw jacks: to lift weight. lead screw of lathe: for axial movement of tool and its precise positioning.