Question

How much work is required to increase the mechanical energy of a car by 1,852 J?Answer

Answer 1

i think it will be by the same amount but am worry

Answer 2

The change of energy of a system is exactly equal to the work done on that system plus the work done by the system.

In this case, the car isn't doing work on anything else.

Hence to increase the mechanical energy on the car, the work done on the car must be equal to exactly the change of energy of the car.

Answer 3

This is called the Work-Energy Theorem

Answer 4

so it means the answer is that the the work required is the same as the mechanical energy?

Answer 5

Work = Change in energy, yes.

Answer 6

thanks

Answer 7

Calculate the work done in lifting a 500-N barbell 2.3 m above the floor. (what is the gain of potential energy of the barbell when it is lifted to this height?) Use g=10 m/s/s

Answer 8

for this question can u explain to me well why the PE is positive

Answer 9

i taught it would be negative