waec model questions vol1 2021 physics
Objective • Question 23
Question 23
WAEC_MODEL_QUESTIONS_VOL1
•
2021
A block‑and‑tackle system consists of two fixed pulleys and one movable pulley, giving an ideal mechanical advantage of 3. An effort of 200 N moves the effort rope through 0.90 m while the load (500 N) rises 0.25 m. Determine (i) the actual mechanical advantage, (ii) the efficiency of the system, and (iii) the magnitude of the constant friction force acting in the system.
Answer Options
A.
MA = 2.3; Efficiency = 65.2%; Friction force = 68.4 N
B.
MA = 3.0; Efficiency = 60.0%; Friction force = 70.0 N
C.
MA = 2.8; Efficiency = 72.0%; Friction force = 55.0 N
Correct Answer
D.
MA = 2.5; Efficiency = 69.4%; Friction force = 61.1 N
Correct Answer
D
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