What is the actual mechanical advantage of a machine with input force of 14 N and an output force of
42 N?
A. 0.33
B. 0.5
C. 3
D. 28

What is hidden during a lunar eclipse? isn't the moon hidden?

Two trains leave a station at the same time, train a travels at a constant speed of 16 m/s. train b starts at 8.0 m/s but accelerates constantly at 1.0 m/s squared. after 10.0 seconds, which train has the greater speed?

Aforklift raises a box above the floor and does 2,000 j of work. if the forklift motor consumes 3,000 j of electrical energy from the battery to raise the box, what is the efficiency of the lift?