Question

A lawnmower engine running for 20 min does 4,560,000 j of work. what is the power output of the engine? (power: p = w/t)

Answer 1

Answer:

A. 3800 W

Hope this helps

Answer 2

Explanation:

Power is defined as the rate at which work is done in per unit time.

Mathematically,            $Power = \frac{Work}{Time}$

It is given that work done by engine is 4,560,000 J and time is 20 minutes.

There is 60 seconds in 1 minute. So, convert minutes into seconds as follows.

                     $20minutes \times \frac{60 seconds}{minute}$

                 = 1200 seconds

Calculate power output of the engine as follows.

                     $Power = \frac{Work}{Time}$        

                                        = $\frac{4,560,000 J}{1200 sec}$

                                        = 3800 J/s

  or,                                 = 3800 Watt

Therefore, the power output of the engine is 3800 Watt.