Question

In the experiment, on finding the weight of a given body by the parallelogram law of vectors,

a) Three pulleys and two weights in all

b) Two pulleys and two weights in all

c) Two pulleys and three weights in all

d) Three pulleys and two weights in all
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Answer 1

Answer:

c the correct answer ok and good afternoon

Answer 2

Option c is the right answer. The apparatus requires 2 pulleys and 3 weights in all (Of which two are known weights and the third one is an unknown weight)

• The parallelogram law of vectors states that the sum of squares of the length of sides of the parallelogram is equal to the sum of squares of the length of their diagonals.
• The equation used here is
• S =$\sqrt{P^{2} +Q^{2}+2Pcos }$θ
• Where
• P, Q are known weights
• S is the unknown weight, which is to be found out.