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Question

A particle moves in X-Y plane under the action of forces F such that the values of linear momentum p at any times is px=2cost and py=2sint. The angle between F and p at the time t will be:

A
0o
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B
30o
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C
90o
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D
180o
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Solution

The correct option is C 90o
Fx=dpx/dt=2sint and Fy=dpy/dt=2cost
so angle between F and p will be 900 because we see that their dot product is zero.

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