Question

If a 25 kg lawnmower produces 347 w and does 9514 J of work, for

Answer 1

Steps 1 and 2)

The variables are W = work, P = power, and t = time. In this case, W = 9514 joules and P = 347 watts.

The goal is to solve for the unknown time t.

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Step 3)

Since we want to solve for the time, and we have known W and P values, we use the equation t = W/P

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Step 4)

t = W/P

t = 9514/347

t = 27.4178674351586

t = 27.4 seconds

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Step 5)

The lawn mower ran for about 27.4 seconds. I rounded to three sig figs because this was the lower amount of sig figs when comparing 9514 and 347.

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Note: we don't use the mass at all