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20m
answered why do light bulbs explode when in contact with water?
31m
answered Glass Tube Diameter to hold water when turned upside down
50m
answered How to (safely) measure the surface area of a human body?
1d
comment How is refractive index related to the density of a medium (for example, air)?
I think your algebraic manipulation is wrong - it should be $n=\sqrt{\frac{1+2G}{1-G}}$
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comment Why is a series resistor needed in a simple thermistor experiment?
Incidentally, if you set your thermistor up in a bridge configuration (two pairs of series resistors, preferably all the same value, and one of them is the thermistor) then you get a very sensitive measure of changes in temperature (because you are measuring voltage difference rather than absolute voltage); it also makes you less sensitive to drift in the cell voltage (if the cell drifts in your circuit, it will immediately lead you to conclude the voltage has changed; if the bridge is balanced, you will read 0 V regardless of cell voltage).
1d
comment How is refractive index related to the density of a medium (for example, air)?
Are you after a robust equation, or a derivation? Because your first link has a good equation for $n_{tp}$ that shows there's a very small deviation from a straight line relationship.
1d
comment finding work done by the buoyant force on a submerged object
The work done by buoyancy is force times distance. The force depends linearly on the amount of water displaced; the distance goes from "fully under water" to "just floating". You need to compute how far the object moves until it floats. Note that part of buoyancy works against gravity, and part against "another force" that holds the object down. See how far you get with those hints.
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comment How did I get these strange electric shocks?
If you think the shocks you got were static electricity I would take a look at the floor. What kind of carpeting? Were you sitting in a chair that rolled? What were you wearing on your feet? Was it cold outside? There are so many possible answers - you do not give enough information for a thoughtful and informed answer.
1d
comment If you play more than one music track at once on a computer, does the sound heard get louder?
@dmckee - thanks for nudging me to do better...
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comment How did I get these strange electric shocks?
@CuriousOne - insulation and isolation. We wrote the same thing four seconds apart...
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comment How did I get these strange electric shocks?
Not really enough information here to say for sure - but I would say you had a very dangerous setup and could have got much more hurt than you did. I believe your water heater lacked proper insulation / isolation. Please, before you do this again, have someone with electrical knowledge check your setup very carefully. You could have got very hurt.
1d
comment If you play more than one music track at once on a computer, does the sound heard get louder?
@dmckee - there is also a significant phase (or lag) detection component involved in the processing of multiple sounds... we can "tune" to sound from a particular direction by selecting for the difference in arrival time between left and right ear.
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revised If you play more than one music track at once on a computer, does the sound heard get louder?
added 1599 characters in body
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comment If you play more than one music track at once on a computer, does the sound heard get louder?
@dmckee - fair point. I will expand...
1d
comment How to control a dc motor?
For a question like this one, you will get better answers at the electronics.stackexchange.com
1d
reviewed Approve COP and input work in a refrigerator
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comment COP and input work in a refrigerator
You will find a representative calculation with references to a paper showing detailed measurements here
1d
comment If you play more than one music track at once on a computer, does the sound heard get louder?
@dmckee I agree with you. In my answer I have tried to distinguish between the physics and the electronics. Does it make sense?
1d
answered If you play more than one music track at once on a computer, does the sound heard get louder?
1d
answered What is the electric field exactly on the surface of a conducting sphere?