379 reputation
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bio website scholastic.us.to
location United States
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visits member for 2 years, 4 months
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1d
comment Most efficient way to cool a two story house with two fans?
Yes, but you have gravity to fight against trying to get the cold air upstairs, no?
1d
comment Most efficient way to cool a two story house with two fans?
@BMS: lower cooling time → higher efficiency
1d
revised Most efficient way to cool a two story house with two fans?
edited tags
1d
asked Most efficient way to cool a two story house with two fans?
2d
comment Why didn't Newton just propose the 2nd Law and leave it at that?
Thanks. Also, "Occam's razor" is actually older than Occam; it was a Scholastic axiom.
Oct
21
comment PhD or master in physics
It sounds like PhDs don't really pay off, then.
Oct
21
comment Where does the energy from a parachute go?
Doesn't it just heat up and make the surrounding air turbulent?
Oct
19
accepted Can neutrons be synthesized purely from protons and electrons?
Oct
19
revised Why does “closing speed” $>c$ not violate relativity's second postulate?
added 66 characters in body
Oct
19
comment Why does “closing speed” $>c$ not violate relativity's second postulate?
Its because the closing speed relates to two particles. So, it never relates two photons or a particle and a photon?
Oct
19
comment Why does “closing speed” $>c$ not violate relativity's second postulate?
@Hypnosifl: Of course; the second postulate applies to light.
Oct
19
comment Why does “closing speed” $>c$ not violate relativity's second postulate?
@BenCrowell: I'm not asking about closing speed between particles but closing speed between, say, two photons or a particle and a photon.
Oct
18
comment Doesn't the second postulate of special relativity imply the existence of “luminiferous ether”?
@BenCrowell: ¿Aren't these statements true: "sound is always propagated in air with a definite velocity $v_\mathrm{sound}$ which is independent of the state of motion of the emitting body." and "Any sound wave moves in the 'stationary' system of co-ordinates with the determined velocity $v_\mathrm{sound}$, whether the wave be emitted by a stationary or by a moving body." (All I did is substitute: light→sound, $c$→$v_\mathrm{sound}$, and "empty space"→"air".)
Oct
18
asked Doesn't the second postulate of special relativity imply the existence of “luminiferous ether”?
Oct
18
comment Why does “closing speed” $>c$ not violate relativity's second postulate?
@BenCrowell: Thanks, I've clarified it.
Oct
18
revised Why does “closing speed” $>c$ not violate relativity's second postulate?
cleared up expression of 2nd Postulate
Oct
18
comment Why does “closing speed” $>c$ not violate relativity's second postulate?
@New_new_newbie Yes, that's one "answer," but I would like another explanation. thanks
Oct
18
revised Why does “closing speed” $>c$ not violate relativity's second postulate?
edited title
Oct
18
asked Why does “closing speed” $>c$ not violate relativity's second postulate?
Oct
17
comment Does the Doppler effect disprove the constancy of $c$?
…it is indeed true that in this frame, the time for the light to get from the stern to the bow is L/(c+v). But it should be $c$ in all frames.