1. A mass of 0.50 kg hangs from a light spring and executes SHM so that its position is given by
x = Acoswt. It is found that the mass completes 20 cycles of oscillation in 80 s. (a) Determine (i) the
period of oscillations, (ii) the angular frequency of the oscillations and (iii) the spring constant k. (b)
Using a value A = 2 mm, make sketches of the variations with time t of the displacement, velocity and
acceleration of the mass.
(a) (i) Since the mass completes 20 cycles of oscillation in 80 s, the period of oscillation is
P = 80 s 20 = 4 s. (ii) the angular frequency of the oscillations is then 1 w 2p P 1.571 rad s . − = = (iii)
Denoting the mass by m, the spring constant is 2 1 k mw 1.234 N m . − = =
(b) For amplitude A = 2 mm = 0.002 m, the displacement, velocity and acceleration are
1. A mass of 0.50 kg hangs from a light spring and executes SHM so that its position is given byx = Acoswt. It is found that the mass completes 20 cycles of oscillation in 80 s. (a) Determine (i) theperiod of oscillations, (ii) the angular frequency of the oscillations and (iii) the spring constant k. (b)Using a value A = 2 mm, make sketches of the variations with time t of the displacement, velocity andacceleration of the mass.(a) (i) Since the mass completes 20 cycles of oscillation in 80 s, the period of oscillation isP = 80 s 20 = 4 s. (ii) the angular frequency of the oscillations is then 1 w 2p P 1.571 rad s . − = = (iii)Denoting the mass by m, the spring constant is 2 1 k mw 1.234 N m . − = =(b) For amplitude A = 2 mm = 0.002 m, the displacement, velocity and acceleration are
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