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Applied Mechanics - Engineering

Q1:

The resultant of two forces P and Q acting at an angle θ, is

A P2 + Q2 + 2P sin θ

B P2 + Q2 + 2PQ cos θ

C P2 + Q2 + 2PQ tan θ

D

E

ANS:D -

Answer should be (P^2 + Q^2 - 2PQcos (a) ) ^0.5; a for angle theta - Using cosine law.