How much work does it take to raise a $7 k g$ $7 kg$ weight $9 m$ $9 m$ ?

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How much work does it take to raise a $7 k g$ $7 kg$ weight $9 m$ $9 m$ ?

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Answer 1 · 2015-12-23T02:58:55

$- 630$ $-630$ $J$ $J$ , considering acceleration due to gravity = $10$ $10$ $m$ $m$ / $s^{2}$ $s^2$

Explanation:

$Work done = Force x Displacement$ $"Work done = Force x Displacement"$ x $cos θ$ $costheta$
i.e. $W = F . s$ $W = F.s$ $cos θ$ $costheta$

Here force acts opposite in the direction of displacement therefore $cos (180^{\circ})$ $cos(180^@)$ = $- 1$ $-1$

Substituting $F = m g$ $F = mg$ we get $70$ $70$ $k g m$ $kgm$ / $s$ $s$ , $s$ $s$ = $9$ $9$ $m$ $m$
We get
$7$ $7$ x $10$ $10$ x $9$ $9$ x $(- 1)$ $(-1)$ = $- 630$ $-630$ $J$ $J$

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How much work does it take to raise a $7 k g$ $7 kg$ weight $9 m$ $9 m$ ?

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Science

Math

Humanities

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How much work does it take to raise a 7kg7 kg weight 9m9 m ?

1 Answer

Explanation:

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How much work does it take to raise a $7 k g$ $7 kg$ weight $9 m$ $9 m$ ?