a crane lifts a 3,000 kg beam of concrete from the ground to a height of 50 m. what work is being done on the concrete?

1,470,000Joules

Explanation:

Work done = Force * distance moves in the direction of the force

Given

mass = 3000kg

distance = 20m

Get the force

F = mg

F = 3000(9.8)

F = 29400N

Get the work done

Work done = 29400 * 50

Work done = 1,470,000Joules

Hence 1,470,000Joules work has been done on the concrete

when insulating materials rub against each other, they may become electrically charged . electrons , which are negatively charged, may be 'rubbed off' one material and on to the other. the material that gains electrons becomes negatively charged. the material that loses electrons is left with a positive charge.

what are the options.

explanation: