A particle of mass m is attached to three identical spr
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| A particle of mass m is attached to three identical springs A, B, C each of force constant k as shown. If the particle is pushed slightly against the spring A and released, find the time period of oscillations
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A. 2π√m2k
B. 2π√mk
C. π√m2k
D. π√mk
Please scroll down to see the correct answer and solution guide.
Right Answer is: A
SOLUTION
Sol Let the particle of mass m at O be pushed downward against spring A. Then the forces produced in springs B and C will be in the directions shown.
If y is the instantaneous compression of spring A, then B and C will be stretched by ycos45∘ each.
∴ Total restoring force on mass m along AO will be
F=FA+FBcos45∘+FCcos45∘
=ky+(kycos45∘)cos45∘+(kycos45∘)cos45∘
=ky(1+2cos245∘)
=ky(1+212)=2ky
⇒
a=2kym∴T=2π√m2k
∴T=2π√m2k