Questions
A particle of mass m is attached to a spring (of spring constant k) and has a natural angular frequency . An external force F(f) proportional to cos is applied to the oscillator. The time displacement of the oscillator will be proportional to
detailed solution
Correct option is B
Given that natural angular frequency =Ï0 Let at any instant t, angular frequency =Ï At a displacement x, the resultant accelerationf=Ï02âÏ2x External forec. F=mÏ02âÏ2x Given that Fâcosâ¡(Ït) â´ mÏ02âÏ2xâcosâ¡(Ït) We know that x=Asinâ¡(Ït+Ï) Where the symbols have their usual meanings' Now A=Asinâ¡(0+Ï) (âµ at t=0,x=A) â´ Ï=Ï/2 thererefore x=Asinâ¡Ït+Ï2=Acosâ¡Ït From eqs. (3) and [5), we gst mÏ02âÏ2Acosâ¡Ïtâcosâ¡Ït or Aâ1mÏ02âÏ2Talk to our academic expert!
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One end of an ideal spring is connected with a smooth block with the other end with rear wall of driving cabin of a truck as shown in figure. Initially, the system is at rest. If truck starts to accelerate with a constant acceleration ‘a’ , then the block (relative to truck ):
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