Question

8. How long does it take a 19 kW steam engine to do 6.8 x 107 J of work?

Answer 1

Answer:

3.58 × 10³ seconds or 59.65 minutes

Explanation:

We are given;

• Power of a steam engine as 19 kW
• Work done as 6.8 × 10^7 Joules

We are required to calculate time;

We need to know that;

• Power = Work done ÷ time
• Power is the rate of doing work.

19 kW = 19,000 Watt

Rearranging the formula;

time = Work done ÷ power

       =  6.8 × 10^7 Joules ÷ 19,000 watt

       = 3578.95 seconds

        = 3.58 × 10³ seconds

But, 60 seconds = 1 minute

Therefore, t = 59.65 minutes