JEE Advanced 2011 Physics question
A point mass is subjected to two simultaneous sinusoidal displacements in x-direction, and . Adding a third sinusoidal displacement brings the mass to a complete rest. The values of B and φ are
Answer: (B)
Solution
Represent the displacements as phasors of length A at angles 0 and . Their resultant has amplitude and phase (by symmetry, halfway between 0 and ): . For
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