The input power to machine is 18000W. Friction converts 1000J of energy into heat each second. What is the efficiency of the machine?Question 11Answera.100%b.94.74%c.94.44%d.5.56%
Question
The input power to machine is 18000W. Friction converts 1000J of energy into heat each second. What is the efficiency of the machine?Question 11Answera.100%b.94.74%c.94.44%d.5.56%
Solution
The answer is b. 94.44%.
Step 1: The input power to the machine is 18000W.
Step 2: Friction converts 1000J of energy into heat each second, which means the output power is 18000W - 1000W = 17000W.
Step 3: The efficiency of a machine is the ratio of the useful output power to the total input power
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