Kinematics Question 444

Question: The sum of the magnitudes of two forces acting at point is 18 and the magnitude of their resultant is 12. If the resultant is at 90 with the force of smaller magnitude, what are the magnitudes of forces?

Options:

A) 12, 5

B) 14, 4

C) 5, 13

D) 10, 8

Show Answer

Answer:

Correct Answer: C

Solution:

[c] Let p be the smaller force and Q be the greater force then according to problem

Pi+Q=18 … (i)

R=P2+Q2+2PQcosθ=12 … (ii)

tanϕ=QsinθP+Qcosθ=tan90o=

P+Qcosθ=0 … (iii) By solving Eqs. (i), (ii) and (iii) we will get P=5 and Q=13 .



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