A person uses 50 N of force on a machine. Because of the 50 N force, the machine lifts a 250 N object. What is the mechanical advantage of the machine?

Moon effect. some people believe that the moon controls their activities. if the moon moves from being directly on the opposite side of earth from you to being directly overhead, by what percentage does (a) the moon's gravitational pull on you increase and (b) your weight (as measured on a scale) decrease? assume that the earth–moon (center-to-center) distance is 3.82 × 10^8 m, earth's radius is 6.37 × 10^6 m, moon's mass is 7.36 × 10^22 kg, and earth's mass is 5.98 × 10^24 kg.

Will you chech and finish these for me, because i am stumped with them.

Which diagram correctly demonstrates the various forces acting on a ball moving horizontally with some speed?