A-steam-envine-of-efficiency-70-burns-20g-of-coal-to-produce-10kJ-of-energy-If-it-burns-200g-of-coal-per-second-calculate-its-output-power-

Question Number 13636 by chux last updated on 21/May/17

A steam envine of efficiency 70 %

burns 20 g of coal to produce 10 kJ

of energy . If it burns 200 g of coal

per second, calculate its output

power .

Answered by ajfour last updated on 21/May/17

20 g \to 10 k J

200 g \to 100 k J

P = \frac{100 k J}{1 s} = 100 k W .

Commented by chux last updated on 21/May/17

thanks but the textbook says 70 kw

Commented by sandy_suhendra last updated on 22/May/17

continued

P_{input} = 100 kW

P_{output} = η . P_{input} = 0.7 \times 100 = 70 kW

Commented by chux last updated on 22/May/17

thanks boss

Facebook Tweet Pin