If it took a gardener 20. minutes (1200 s) to finish tilling his garden using 3500 W of power, how much work did he do?

Physics help

2 Answers
Mar 14, 2018

4,200,000 \ "J"=4.2 \ "MJ"

Explanation:

Well, power is expressed through the equation:

P=W/t

where W is work done in joules, and t is the time in seconds.

Here, we need to solve for work, so we can rearrange the equation into

W=P*t

Plugging in the given values, we get

W=3500 \ "W"*1200 \ "s"

=4,200,000 \ "J"

=4200 \ "kJ"

=4.2 \ "MJ"

That's actually an unimaginable amount of work done by a human being!

Mar 14, 2018

"4.2 MJ"

Explanation:

"Power" = "Work"/"Time"

"Work = P × t" = "3500"\ "Joule"/cancel"s" × 1200 cancel"s" = "4200000 Joule"

In simple,

"4200000 Joule" = 4.2 × cancel(10^6\ "Joule") × "1 MJ"/(cancel(10^6\ "Joule")) = "4.2 MJ"