The device pictured in Figure 15.33 entertains infants while keeping them from w

Question

The device pictured in Figure 15.33 entertains infants while keeping them from wandering. The child bounces in a harness suspended from a door frame by elastic bands.

(a) If the elastic stretches 0.240 m while supporting a 13.0 kg child, what is its force constant?
1     N/m
(b) What is the time for one complete bounce of this child?
2     s
(c) What is the child's maximum velocity if the amplitude of her bounce is 0.200 m?
3     m/s

I got the first one right, but b and c are incorrect.

The device pictured in Figure 15.33 entertains infants while keeping them from wandering. The child bounces in a harness suspended from a door frame by elastic bands. If the elastic stretches 0.240 m while supporting a 13.0 kg child, what is its force constant? What is the time for one complete bounce of this child? What is the child's maximum velocity if the amplitude of her bounce is 0.200 m?

Explanation / Answer

b.time period=2*pi *root of m/k =1 sec

c.Amplitude*omega=1.2779 m/s

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