Formula for unbalanced primary couple

Q.  The unbalanced primary couple caused due to reciprocating mass of each cylinder is given as
- Published on 11 Sep 15

a. mrlω2 cos θ
b. mrlω (cos θ / n)
c. mrlω2 cos 2θ
d. mrω2 cos 2θ

ANSWER: mrlω2 cos θ

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