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Question

A spring having with a spring constant 1200 N m–1 is mounted on a horizontal table as shown in Fig. A mass of 3 kg is attached to the free end of the spring. The mass is then pulled sideways to a distance of 2.0 cm and released.

Determine (i) the frequency of oscillations, (ii) maximum acceleration of the mass, and (iii) the maximum speed of the mass.

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Solution

Spring constant, k = 1200 N m–1

Mass, m = 3 kg

Displacement, A = 2.0 cm = 0.02 cm

(i) Frequency of oscillation v, is given by the relation:

Where, T is the time period

Hence, the frequency of oscillations is 3.18 cycles per second.

(ii) Maximum acceleration (a) is given by the relation:

a = ω2 A

Where,

ω = Angular frequency =

A = Maximum displacement

Hence, the maximum acceleration of the mass is 8.0 m/s2.

(iii) Maximum velocity, vmax = Aω

Hence, the maximum velocity of the mass is 0.4 m/s.


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