Answer :
Final answer:
To calculate the energy supplied to an engine with a 30% efficiency and a power output of 3000W in 20s, first calculate the output energy (Power * Time), then divide by the efficiency as a decimal. The answer is 200,000J.
Explanation:
In this physics problem, we are asked to find out how much energy is supplied to an engine. Here, power output of the engine is given as 3000W and its efficiency is given as 30%. The formula for engine output is Power = Energy/Time. As we know both power and time, we can use these values to find energy. However, this would give us the useful energy output. To find the total energy input, we divide the output by the efficiency (as a decimal). So the energy supplied to the engine in 20 seconds is (3000W * 20s) / 0.30 = 200,000 Joules.
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