In a shipping yard, a crane operator attaches a cable to a 1240-kg shipping container and then uses the crane to lift the container vertically at a constant velocity for a distance of 37 m. determine the amount of work done by each of the following.
(a) the tension in the cable? (j)
(b) the force of gravity? (j)

Alightning strike consists of charge moving from a cloud to the ground . in one particular case, the electrons in a lightning strike are confined to travel within a radius of 1.5 m and to move at a speed of 5.0 x 10 m/s. if the density of electrons in the strike is 10'15 electrons/m what current is carried by the lightning ?

John throws .4 kg ball with velocity of 18 m/s. hits .2 kg bottle and bottle flies 25 m/s. how fast is ball traveling after hitting the bottle?

If the area of a square has increased by a factor of 16, by how much has each side increased?