See attachment for full details but I need help with this one
9) Suppose the fabled Loch Ness Monster happened to swim by, grab the center of the bridge where we were standing, and shake it up and down at twice the frequency that you calculated in question 4. That is the frequency of the second harmonic. Why would a standing wave not form on the bridge in that case?

Question

See attachment for full details but I need help with this one
9)	Suppose the fabled Loch Ness Monster happened to swim by, grab the center of the bridge where we were standing, and shake it up and down at twice the frequency that you calculated in question 4. That is the frequency of the second harmonic. Why would a standing wave not  form on the bridge in that case?

anonymous · Answer

attachment

anonymous · Answer

Well I would suggest taking a look at the standing wave pattern for a second harmonic.
If the bridge is being shaken up and down at its centre, would that mean the centre is a node or an antinode ?
Is that compatible with the shape of  the second harmonic ?

By the way, I don't think you have the right answers for parts 2, 3, 7 or 8.

anonymous · Answer

I would assume that the center is an antinode or a loop...

anonymous · Answer

You mean the centre is an antinode when the bridge is being shaken at the centre ?

anonymous · Answer

2)	What was the vertical amplitude, A, of the bridge, in inches?
ANSWER:  If A= D/F and we are told that the distance is 160 ft or 50 m, Then we must find the F.
F= 24 Oscillations / 15 seconds = 1.6 Hz
Then A = 160 ft/ 1.6 Hz= 100 
The question asks for cm. There are 30.48 cm per ft, so 100*30.48 = 3048
So A= 3048 cm

anonymous · Answer

Is that correct for number 2?