# All Questions

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### acceleration and General Theory of Relativity

Carlos I Calle is a prominent NASA scientist with extensive experience with Einstein's theories. In 2011-12 he wrote a book for the Wiley 'Dummies' edition--Einstein for Dummies.There he says that ...
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### Why bremsstrahlung occurs only with the nuclei? Why not with the electrons?

In many books I read that bremsstrahlung effect (for e+) only occur when the electron goes near the atomic nuclei. Why is not possible when cross near an atomic electron? Thanks,
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### If a body slides down a frictionless inclined plane what will be the net normal force?

If a body(m) slides down a frictionless inclined plane (M), will the net normal force between the ground and the inclined plane be (M+m)g ? I feel it should be less than (M+m)g. This is because one ...
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### Galileo proved wrong? [duplicate]

Galileo stated that objects dropped from the same height will hit the ground at the same time, that the rate of gravity is constant for all objects no matter the mass. But I think there is a flaw in ...
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### Is CNOT a one-qubit or two-qubit operation? [closed]

Is CNOT a one-qubit or two-qubit operation? It has inputs of two qubits and needs two quantum wires.
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### Does a changing magnetic field impart a force on a stationary charged particle?

Does a collapsing and re-establishing magnetic field impart a force on a stationary charged particle ? Does the charge particle get repelled and or attracted ? Does it move or spin ?
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### What quantum entities are responsible for “classic” magnetism?

What quantum entities give rise to what is known as "magnetism" in the Maxwell equations?
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### Why electromagnetic fields are defined as 4-D Function?

If electromagnetic fields propagate along 3-D spaces why are they defined as function of space (X,Y,Z) and time t. For me would be enough to use two functions E(x,y,z) and H(x,y,z) to model the ...
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### Can volume affect capacitance?

I know the math doesn't support it, but will a solid sphere and a thin foil, both of the same surface area, measure exactly the same capacitance? Do electrons strictly gather on the surface ...
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### Permanent flying balloon

We all know balloons which are filled with gas that's less dense than air. After a few hours, the balloon drops to the ground. The reason for this phenomenon, as far as i understand, is that the ...
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### Is there any conductive graphene with functional groups in markets or I have to modify graphene myself?

My thesis is a comparative study between 2 kind of nanocomposites based on graphene. We should use of graphene with and without functional groups and both should be electrical conductive. But I don't ...