User alvoutila - Physics Stack Exchange

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	214 reputation	bio	website		visits	member for	1 year, 2 months
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2

votes

2

answers

333

views

Why does Venus transit so slowly?

solar-system transit

feb 17 at 5:43 Nathaniel 6,149

1

2

votes

1

answer

331

views

How to derive the Manley-Rowe relation for the process of the second harmonics generation?

non-linear-optics

apr 17 '12 at 2:06 Carl Brannen 6,547

1

vote

1

answer

58

views

Has martian sunset same spectra than this earthly bluish-violet sunset?

planets solar-system atmosphere

may 1 at 4:39 Deer Hunter 165

1

vote

1

answer

43

views

What is the most optimal earth's axial tilt in terms of variation of seasons?

earth geophysics

apr 26 at 13:28 Jim 1,230

1

vote

3

answers

116

views

So do I use this Lorentz's law or which law do I use?

homework electromagnetism forces

nov 3 at 2:17 PatEugene 56

1

vote

1

answer

257

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In which of the above figures will the light bulb be glowing?

homework electromagnetism

nov 2 at 17:33 Ron Maimon 44.8k

1

vote

1

answer

345

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Which one true in First law of thermodynamics: $Q = \Delta U \pm W = \Delta U \pm p\Delta V$ or $\Delta U= \Delta Q + \Delta W $?

thermodynamics definition

oct 11 at 14:09 Emilio Pisanty 7,021

1

vote

2

answers

125

views

Is it true that the mass of air in normal atmospheric pressure over 1$m^2$ is 10326 $kg$?

thermodynamics

oct 11 at 11:20 FrankH 4,772

1

vote

0

answers

90

views

How far is the horizon, if a 2m tall man watches to the sea?

homework geometry earth

sep 24 at 15:02 Qmechanic♦ 17.2k

1

vote

2

answers

101

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Is there any way to survive solarwinter like in Sunshine - movie?

astrophysics

jun 14 '12 at 23:06 ralph346526 26

0

votes

1

answer

69

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What is the difference of work $W$ and thermal energy $Q$ in thermodynamic Stirling-process for ideal gas?

thermodynamics energy heat work

2d ago Community♦ 1

0

votes

2

answers

82

views

At what depth in the water atmospheric pressure is 100 times greater than on the ground?

thermodynamics

feb 12 at 19:11 dmckee♦ 21.3k

0

votes

1

answer

95

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How to get energy of collision if you know force of gravity of an object($m \rightarrow F=mg$)?

newtonian-mechanics energy newtonian-gravity collision

jan 29 at 15:00 Chris 1,437

0

votes

0

answers

105

views

Did force of gravity cause macroevolution?

gravity cosmology big-bang

jan 27 at 20:58 alvoutila 214

1

0

votes

2

answers

136

views

Why laundry dry up also in cold/frost?

thermodynamics water freezing

dec 2 at 13:56 anna v 25.8k

0

votes

2

answers

53

views

How to show that if two masses($m_1$ and $m_2$) are connected($r_1<r_2$) with a string moving around a point A, they move with same angular velocity?

homework classical-mechanics rotation

nov 30 at 12:49 Bernhard 1,906

0

votes

1

answer

90

views

What is the electric current $I_{12}$ and voltage $U_{12}$ in following electric circuit? [closed]

homework electric-circuits

nov 20 at 20:45 alvoutila 214

0

votes

2

answers

1

kviews

Why is electric field zero inside a hollow metal sphere ?

homework electrostatics electric-field charge

nov 15 at 11:42 Ϛѓăʑɏ βµԂԃϔ 5,264

0

votes

1

answer

1

kviews

Distribution of charge on a hollow metal sphere

homework electromagnetism

oct 17 at 15:44 RedGrittyBrick 1,372

0

votes

1

answer

83

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How to evaluate heating value on the basis on these data?

thermodynamics

oct 4 at 14:20 John Rennie 43.9k

0

votes

1

answer

54

views

What is primary reason for a matter to be transparent as Cornea is?

optics

oct 3 at 20:51 RedGrittyBrick 1,372

0

votes

1

answer

135

views

Where do you get $I_p=\frac{P}{4 \pi r^2} sin \alpha$?

homework visible-light

jul 17 at 3:42 Community♦ 1

0

votes

1

answer

78

views

Is there any way to produce food without sun, synthetically?

astrophysics

jun 19 '12 at 15:53 Ron Maimon 44.8k

1

0

votes

2

answers

182

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So where is mistake in the formula of wave number (magnitude of wave vector)?

homework waves vectors

apr 18 '12 at 19:45 Colin K 4,686

0

votes

2

answers

133

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When to use $f$ and when $\nu$ signifying frequency?

frequency notation nomenclature

apr 17 '12 at 7:15 nibot 3,933

0

votes

2

answers

632

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Why the pressure of atmosphere doesn't crush you when you e.g. walk outside?

experimental-physics pressure atmosphere biophysics

apr 16 '12 at 20:53 Martin Beckett 11k

-1

votes

2

answers

92

views

What is current of electric circuit which has only one component - a battery (or cell)? [closed]

electric-circuits current

nov 19 at 17:23 user1512321 58

-1

votes

1

answer

78

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What it is like to walk on black hole? Is it hot inside the horizon? How big stars form into black holes? [closed]

black-holes

oct 9 at 18:59 Prathyush 708

-1

votes

2

answers

184

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Why do you get electric field of a light wave?

electromagnetism electromagnetic-radiation waves electric-field

jul 24 at 9:47 David Zaslavsky♦ 27.3k

alvoutila

29 Questions