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 C90o 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.