4-12 An object of mass 2 kg hangs from a spring of negligible mass.The spring is extended by 2.5 cm when the object is attached. The top end of the spring is oscillated up and down in SHM with an amplitude of 1 mm. The Q of the system is 15. (a) What is wo for this system? (b) What is the amplitude of forced oscillation at W=W0? (c) What is the mean power input to maintain the forced oscillation at a frequency 2% greater than WO0? [Use of the approximate formula, Eq. (4-26), is justified.
4-12 An object of mass 2 kg hangs from a spring of negligible mass.The spring is extended by 2.5 cm when the object is attached. The top end of the spring is oscillated up and down in SHM with an amplitude of 1 mm. The Q of the system is 15. (a) What is wo for this system? (b) What is the amplitude of forced oscillation at W=W0? (c) What is the mean power input to maintain the forced oscillation at a frequency 2% greater than WO0? [Use of the approximate formula, Eq. (4-26), is justified.
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Transcribed Image Text:4-12 An object of mass 2 kg hangs from a spring of negligible mass.The spring is
extended by 2.5 cm when the object is attached. The top end of the spring is oscillated
up and down in SHM with an amplitude of 1 mm. The Q of the system is 15.
(a) What is wo for this system?
(b) What is the amplitude of forced oscillation at W=W0?
(c) What is the mean power input to maintain the forced oscillation at a frequency 2%
greater than W0? [Use of the approximate formula, Eq. (4-26), is justified.
100
80
20
36
38
40
42
44
a (sec")
4-13 The graph shows the power resonance curve of a certain mechanical system when
Input power, watts
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