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Q.

When two displacements represented by large {Y_1}, = ,asin left( {omega t} right) and large {Y_2}, = ,bcos left( {omega t} right) are super- imposed the motion is  

 

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a

 not a simple harmonic

b

simple harmonic with amplitude large frac{a}{b}

c

 simple harmonic with amplitude large sqrt {{a^2} + {b^2}}

d

simple harmonic with amplitude large left( {frac{{a + b}}{2}} right)

answer is C.

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Detailed Solution

y = y1+y2 = large asin omega t + bcos omega t

large therefore y, = ,sqrt {{a^2} + {b^2}} sin left( {omega t + {{tan }^{ - 1}}frac{b}{a}} right)

so the resulting motion is SHM with amplitude large sqrt {{a^2} + {b^2}}

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