Kinematics Question 276

Question: A particle moves in the x-y plane under the action of a force F such that the value of it’s linear momentum (P) at anytime t is Px=2cost,py=2sint. The angle θ between F and P at a given time t. will be [MNR 1991; UPSEAT 2000]

Options:

A) θ=0

B) θ=30

C) θ=90

D) θ=180

Show Answer

Answer:

Correct Answer: C

Solution:

Px=2cost , Py=2sint P=2cost i^+2sint j^

F=dPdt=2sint i^+2cost j^

F.P=0 θ=90



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