Question

Determine the amount of power

used in holding a 25 kg box, 1.5
meters above the floor, for 60
seconds.

[?] W

(answer is not 6.13)

Thank you in advance!

Answer 1

Here is your answer mate,

Question,

`Determine\: the\: amount\\ \: of\: power\:used\: in\\\: holding\: a\: 25\: kg\: box\:\\ , \: 1.5\: meters \: above\: the\: floor\\\: for\: 60\: seconds`

Answer,

• Power is equal to work done per unit time

• Work is force × displacement

• SI UNIT OF WORK Newton meter

• SI UNIT OF POWER Watt

Solution,

Given,

`MASS \: IS\: 25\: KG\: \\ and \: HEIGHTIS\: 1.5m\:`

WORK DONE (done against gravity) =

mass×acceleration due to gravity ×height

WORK = 25× 10× 1.5

`\: \: \: \: \: \: \: \:\: \: \: \: \: \: \:`= 375 Nm

Now

POWER =

`\: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \:(work)/(time)`

POWER

`\: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \:= (375)/(60) Watt`

`\: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: =6.25`

`Therfore\: your \: answer\: is\: 6.25`

Check this,

`Acceleration\: due\: to \: gravity\\\: can\: be\: 9.8\: m/s²\: \\As\: nothing\: mentioned\\\: in\: question\: \\I \: took \: it \: as \: 10`

Have a good day