A baby bouncer consisting of a harness and elastic ropes is suspended from a doorway. When a baby of mass 10 kg is placed in the harness, the ropes stretch by 0.25 m. When the baby bounces, she starts to move with vertical simple harmonic motion. What is the time period of her motion?
A 1.0 s
B 2.1 s
C 2.3 s
D 3.1 s
A body moves with simple harmonic motion of amplitude 0.50 m and period 4π seconds. What is the speed of the body when the displacement of the body from the equilibrium position is 0.30 m?
A 0.10 m s^-1
B 0.15 m s^-1
C 0.20 m s^–1
D 0.40 m s^–1
The time period of oscillation of a simple pendulum of length l is the same as the time period of oscillation of a mass M attached to a vertical spring. The length and mass are then changed. Which row, A to D, in the table would give a simple pendulum with a time period twice that of the spring oscillations?
A
B
C
D
A body moves with simple harmonic motion of amplitude 0.90 m and period 8.9 s. What is the speed of the body when its displacement is 0.70 m?
A 0.11 m s^–1
B 0.22 m s^–1
C 0.40 m s^–1
D 0.80 m s^–1
The period of vertical oscillation of a mass-spring system is T when the spring carries a mass of 1.00 kg. What mass should be added to the 1.00 kg if the period is to be increased to 1.50 T?
A 0.25 kg
B 1.00 kg
C 1.25 kg
D 2.00 kg
A body moves with simple harmonic motion of amplitude A and frequency b/2pi. What is the magnitude of the acceleration when the body is at maximum displacement?
A zero
B 4π^2Ab^2
C Ab^2
D 4π^2A/b^2
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