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27 June, 13:18

To change a tire, you need to use a jack to raise one corner of your car. While doing so, you happen to notice that pushing the jack handle down 20 cm raises the car only 0.2 cm. Use energy concepts to explain why the handle must be moved so far to raise the car by such a small amount.

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  1. 27 June, 14:00
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    The energy lost by the handle in lowering is equal to the energy gained by the car in raising the height.

    As the mass of car is much more as compared to the jack, so the height raised by the car is very small as compared to the handle of jack.
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