waec model questions vol1 2021 physics
Objective • Question 15
Question 15
WAEC_MODEL_QUESTIONS_VOL1
•
2021
A block‑and‑tackle system is used to lift a load of 500 N. The effort applied is 150 N. While the load is raised by 0.30 m, the point of application of the effort moves through 0.90 m. Determine (a) the ideal mechanical advantage (IMA), (b) the actual mechanical advantage (AMA), and (c) the efficiency of the system as a percentage.
Answer Options
A.
IMA = 3.00, AMA = 3.33, efficiency = 90%
B.
IMA = 3.33, AMA = 2.78, efficiency = 84%
C.
IMA = 3.33, AMA = 3.00, efficiency = 80%
Correct Answer
D.
IMA = 3.33, AMA = 3.00, efficiency = 90%
Correct Answer
D
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