A normal spinning top will spin forever, at least in theory. However in reality there is friction, which will slow down the top over time. This will be the case with any contraption that you can come up with.
When Ne (Z=10) decays to Na (Z=11), what is the maximum kinetic energy of the emitted electron? What is the minimum energy? What is the energy of the neutrino in each case? Ignore recoil of the daughter nucleus.
E = mc^2
The Attempt at a Solution
I think he is talking about that demonstration of momentum where you have several bouncing balls on top of each other, let them fall and then watch the top one bounce up very high. The question then is, is it possible with enough balls/starting height to have the top ball reach escape velocity...
What do you mean they would "resist" an ideal scenario? I'm assuming that by ideal, you mean the scenario mentioned in my assumption (no rotation, uniform density...), but I'm not sure how a force could "resist" something. So I hope you could clarify that point.
Well, that's what I though too...
You do not need the distance in this case, because the three points (two points sources and the location you are interested in) lie in a straight line. Since it is the difference in distance that you are interested in, for a straight line this is just the distance between them.
Yes, that is exactly what it means. Since the distance is not a multiple of the wavelength, the crests do not line up with each other and neither do the troughs. Since it is not a multiple of wavelengths plus a half of a wavelength apart, the troughs do not line-up with the crests and so do not...
Try to layout the tin can as a map. That is, if you cut the edges and and layed everything flat. How would it look like?
Or lookup the equation for the surface area of a cylinder.
No, deriative of something is how much one thing changes in respect to another.
That sounds about right. First you have the volume of pure iron (assuming the holes don't weigh anything ;) ) and then you have the actual volume. The difference should be the volume of non-iron stuff.
Some time ago I watched this http://www.youtube.com/watch?v=FAFUSbIs5KA".
However in it I assumed that the Earth is not rotating and I would like to know what would happen if I did not make that assumption
I do believe that if the Earth is rotating, it will affect the speed of...
You were on the right track, but mass of the displaced water does not equal to the mass of the cavities. But the volume of the casting equals to the volume of the displaced water. Try to continue from there.
I don't really understand what this question is asking exactly, so I'll leave...