1. A vibrating point on a spring travels 60 mm during three cycles. What is the amplitude of the vibration?
my answer: I got 10 mm but I'm not sure if it is the correct answer.
2. For two connect pendulums to resonate, they must have the same:
a) mass
b) amplitude
c) density
d) length
e) temperature
my answer: d-length
3. What will be the result if a crest with an amplitude of 30 cm overlaps a trough with an amplitude of 5.0 cm?
a) crest with an amplitude of 35 cm
b) trough with an amplitude of 35 cm
c) crest with an amplitude of 25 cm
d) trough with an amplitude of 25 cm
e) crest with an amplitude of 6 cm
my answer: c