Question #8d57a

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Answer 1 · 2016-04-23T13:39:52

$A)weight=800N$
$B)work=24000J$
$C)Power=600Wa$

$A)$
$"weight=mass.gravity acceleration"$
$G=weight$
$m=mass$
$g=10(N)/(k)g$
$G=m*g$
$m=80kg$
$G=80*10$
$G=800N" weight of beam"$

$B)$
$Work=Force*distance$
$Work=W$
$Force=G$
$distance=h$
$W=G*h$
$G=800N" "h=30m$
$W=800*30$
$W=24000J$

$C)$
$Power="Work done"/"time"$

$Power=P$

$"Work done=W"$

$time=t$

$P=W/t$

$W=24000J" "t=40s$

$P=24000/40$

$P=600Wa$