Neco 2021 Physics Question 29

Practice objective / multiple choice question 29 from the 2021 Neco Physics examination.

Neco 2021 Physics Objective / Multiple Choice Medium Difficulty
Question 29 NECO • 2021 • PHYSICS • objective

A simple lever is \(1.20\ \text{m}\) long. The fulcrum is placed \(0.30\ \text{m}\) from the effort end and \(0.90\ \text{m}\) from the load end. A load of \(500\ \text{N}\) is attached at the load end. Because of axle friction, the effort required to keep the lever in equilibrium is \(210\ \text{N}\). Determine (a) the efficiency of the lever (as a percentage) and (b) the frictional torque at the fulcrum (in N·m).

Answer Options

A. Efficiency = 68%; Frictional torque = 15 N·m
B. Efficiency = 85%; Frictional torque = 10 N·m
Correct Answer C. Efficiency = 79%; Frictional torque = 13 N·m
D. Efficiency = 75%; Frictional torque = 12 N·m
Correct Answer
C
Correct Option:
Efficiency = 79%; Frictional torque = 13 N·m

About This Question

This is Neco 2021 Physics Question 29. It is one of the objective questions from the 2021 Neco Physics examination.

Difficulty level: Medium .

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