Question

Give one example which follows the law of parallelogram of forces​

Answer 1

Answer:

example:

Q)Two forces 5 N and 20 N are acting at an angle of 120 degree between them . Find the resultant force in magnitude and direction.

Solution : Here A = 5 N

B = 20 N ; θ= 120 degree ; R= ?; beta =?

R= sqrt of A^2+ B^2+ 2 AB cosθ

= sqrt of 5^2 + 20^2+ 2 X 5 X 20 cos 120 degree

= sqrt of 325

= 18.03 N

tan beta = 5 sin 120 /20 + 5 cos 120

= 5 sqrt 3 / 2 /20 +5 X (-0.5)

= 0.2475 = tan 13 degree 54 min

hence, beta = 13 degree 54′

Explanation:

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