You do 25 J of work in pushing a crate up a ramp. If the output work from the inclined plane is 10 J, then what is the efficiency of the inclined plane?

Mike walks 100 meter north, then walks 30 meters south. after this, he walks another 10 meters north. what is the magnitude of his total displacement during this walk,in meters?

The plum pudding model of the atom states that ?

Two point charges are separated by a certain distance. how does the strength of the electric field produced by the first charge, at the position of the second charge, change if the second charge is doubled? a. the field does not change b. the field strength decreases by half. c. the field strength doubles d. the field strength quadruples