A boy pulls a nail from the wall with a string tied to the nail....

WAEC 1989

A boy pulls a nail from the wall with a string tied to the nail. The string is inclined at an angle of 60^o to the wall. If the tension in the string is 4N, what is the effective force used in pulling the nail?

A. 2√3 N
B. 4 N
C. 4√3 N
D. 8 N
E. 2 N

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Correct Answer: Option A

Explanation

F = 4 x sin 60^o
F = 4 x √3/2 = 2√3 N

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A boy pulls a nail from the wall with a string tied to the nail....

Correct Answer: Option A

Explanation

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