#### Xiah

##### Newbie level 3

Hi guys i'm pretty new here and i'm just looking for abit of help really. I'm attempting my physics assignment and i can't for the world of me figure out how to work this one out and searching online for equations is just making it more confusing for me! The question is below.

A 4700 uF capacitor is charged to a p.d. of 10v. When the capacitor is discharged through a small electric motor, the motor lifts a weight of 0.1N through a height of 0.12m.

I need to work out the energy stored in the charged capacitor -

The gravitational potential energy gained by the weight

The efficiency of the energy transfer - This one i think i can do!

Any help at all would be greatly appreciated so thanks in advance!!

A 4700 uF capacitor is charged to a p.d. of 10v. When the capacitor is discharged through a small electric motor, the motor lifts a weight of 0.1N through a height of 0.12m.

I need to work out the energy stored in the charged capacitor -

**I've done this one I think! E = 1/2 CV^2 which is 1/2 * 4700 * 100**The gravitational potential energy gained by the weight

The efficiency of the energy transfer - This one i think i can do!

Any help at all would be greatly appreciated so thanks in advance!!

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