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The length & the cross-section determines the pitch of the vibrating member...
sheriffbullock 5 months ago
Vibration. Heat (Thermal) is caused by increased vibration. Acoustics is also a result of vibration. He is essentially explaining vibration through friction and its side effects.
Dr. Miller is a wonderful teacher and we need 1000’s more like him.
He does not teach Physics by formula. He demonstrates Physics and makes us think.
A teacher that makes you think is by far more superior to one that reads the curriculum of a school board.
Dr. Miller, RIP (we miss you)
pgc4sean 11 months ago
gotta feel sorry for his kids... "my toys are no fun any more"
ujahooda 1 year ago
It is so sad because if i had watched these videos when i was a child i would have appreciated my toys and learned a lot from them.
kyon9394 1 year ago
well, funny guy
however, a xylophone should be made of wood (xylos means wood), the thing he starts off with is really a metallophone. And if the picture he was writing is supposed to illustrate the actual movement of the slab, it is not. the ends are not bending as in the picture,
sorry for the possible pettiness
anderserk 3 years ago
I think they would, when you put a point load on the center of a beam the segments of beam beyond the two supports bend upward and the center bends downward. I'd guess it would do the same here.
moscowfragfest 2 years ago
@anderserk You're right about the wood versus metal but you're wrong about the ends not bending (vibrating). Try hitting a xylophone bar and touching the end, the sound will die out quickly when you touch it, meaning it is in fact vibrating. I have studyed the physics of xylophones in great detail.
brianderson1 1 year ago
@anderserk The drawing was a common way to draw a vibrating bar in the first (primary) vibrating mode, in which there are two antinodes and the ends of the bars move in the manner described. Do you suggest the vibrations only happen between the two nodal mounting points (.224L and .776L) and the ends of the bar do not move up/down (or some other way)? This could easily be tested by striking the bar then touching the end with one's finger. JSM would approve of such an empirical approach.
fratermus 1 year ago
This crazy pedophile guy is actually kind of amusing
brycebutko 4 years ago
R.I.P. Dr. Sumner was an amazing dude.
mackhine 4 years ago 15