Question

Question #8d57a

Answer 1

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

Explanation:

`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`