Question Detail

PHY 101 PHY 101 Past Questions Objective Question
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Question

A uniform meter rule AB is supported at its centre of gravity by a knife edge. A force of 4 N is applied at a point which is 20 cm from end A of the rule. Calculate the force which must be applied to end B to restore the equilibrium of the rod.
Options
A 2 N
B 1.5 N
C 2.4 N
Correct Answer
D 2.5 N
Correct Answer

Option C is the correct answer.

Detailed Explanation

Pivot at 50 cm. Distance of 4 N force from pivot = 30 cm = 0.3 m. Distance of force at B = 50 cm = 0.5 m. Using moments: 4×0.3 = F×0.5 → F = 2.4 N.

Hint

Clockwise moment equals anticlockwise moment.

Question Info

Course: PHY 101
Topic: PHY 101 Past Questions
Type: Objective
Difficulty: Not specified
Question 144 of 1250
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