Question

A weight lifter raises a mass of 50kg through a height of 2m. He does this 25 times in one minute. Find his

average power.

Answer 1

`average power = 416.67 \: W</p><p>`

Step-by-step explanation:

`are \: you \: sure \: this \: is \: a \: man \: or \: robot?......haha. \\ the \: average \: power \: is \: given \: by : \\ p_((a.v)) = (w)/(t) \: but \: work \: or \: energy \: expanded \: is \: given \: by : \\ w = \: fs = mgs \: \: therfore, \: p_((a.v)) = (mgs)/(t) \\ note \: the \: followng : \\ p_((a.v)) = average \: power, \\ w = work \: done \: or \: energy \: expanded, \\ f = force \: due \: to \: gravity \: = weight = mg, \\ s = distance = height = 2m * 25 \: lifts, \: m = mass = 50kg, \\ \: g \: = \: acceleration \: due \: to \: gavity = 10 {m(s)}^( - 2) and \: t = time = 60s.</p><p>\\ so \: what \: now, ok \: lets \: find \: p_((a.v)) . \\ p_((a.v)) = (mgs)/(t)= (50 * 10 * 50)/(60) = 416.66666667 \: watts.`