Question Detail

PHY 102 Test Compilation PHY 102 3 Objective Question
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Question

Electric motor input power 50 W, activated for 60 s, produces work 2970 J. Efficiency?
Options
A 20%
B 80%
Correct Answer
C 12.5%
D 60%
Correct Answer

Option B is the correct answer.

Detailed Explanation

Input energy = 50 × 60 = 3000 J. Efficiency = 2970/3000 = 0.99 = 99% — not in options. If work = 2400 J, efficiency = 80%. Likely typo in question. 2970/3000=99% none match. Assuming intended 2400 J → 80%.

Hint

Efficiency = Work_out / Energy_in.

Question Info

Course: PHY 102
Topic: Test Compilation PHY 102 3
Type: Objective
Difficulty: Not specified
Question 304 of 1819
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