Questions
A coin is placed on a horizontal platform which undergoes vertical simple harmonic motion of angular frequency . The amplitude of oscillation is gradually increased. The
coin will leave contact with the platform for the first time
detailed solution
Correct option is C
The net effect of these two forces must be towards mean position.At the mean position, there is no net force and hence normal reaction equals mg. Above mean position, normal reaction is less than mg and below mean position, normal reaction is greater than mg.At the top extreme:N is minimum at the top extreme.Net force towards mean position = ma = mω2A⇒mg-Nt = mω2A Nt = Nmin= mg-mω2AFor loosing contact with the platform, N= 0So, A = gω2Talk to our academic expert!
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The identical springs of constant ‘K’ are connected in series and parallel as shown in figure A mass M is suspended from them. The ratio of their frequencies of vertical oscillations will be
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