ID-78673395 14.68 2 of 2 return to Problem 14.68 n the This is the mass of the b
ID: 2078424 • Letter: I
Question
ID-78673395 14.68 2 of 2 return to Problem 14.68 n the This is the mass of the bell itself plus the mass of the water Express your answer to two significant figures and include the appropriate units. of its bell, a flexible structure on top of its body. The m= 17 g Give Up jellyfish emits one jet right after the other, but we can get some insight into the jet system by looking at a single jet thrust. Figure shows a graph of the motion of one point in the wall of the bell for such a single jet; this is the pattern of a damped oscillation. The spring constant for the bell can be estimated to be 1.2 N/m. Correct By decrease over one period? Given this, what is the time constant for the damping? Express your answer to two significant figures and include the appropriate units. Deflection (cm) 0.6 0.3 t (s) 11 Value Is -0.3 -0.6 ContinueExplanation / Answer
Amplitude a = Ae^(-t/T)
Putting t=0.25s
0.6 = A e^(-1/4T)
At t=1s,
0.15 = A e^(-1/T)
Dividing first equation by second,
4 = e^(-1/4T +1/T)
ln 4 =0.75/T
T = 0.75/ ln4
= 0.54 s answer