User jak - Physics Stack Exchange

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	366 reputation	bio	website		visits	member for	1 year, 5 months
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4

votes

5

answers

331

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This sentence makes no sense, electrostatics and electrons moving in a conductor - current

electricity

may 15 '12 at 19:35 Ron Maimon 44.8k

3

votes

3

answers

230

views

Do I have the meaning of the property temperature correct?

thermodynamics

sep 10 at 9:47 Arnold Neumaier 13.9k

2

votes

2

answers

303

views

This is going to sound really stupid. But how do I change my normal force?

newtonian-mechanics forces

mar 25 at 3:40 Asad 125

2

votes

2

answers

561

views

Electric potential of sphere

homework electrostatics electric-field potential gauss-law

aug 9 at 15:28 Shaktyai 1,335

2

votes

2

answers

2

kviews

Would you die if you put your hands on a powerline?

electricity potential

may 15 '12 at 19:25 endolith 1,363

2

votes

3

answers

961

views

Why did they add a Centripetal Force in the Free-Body Diagram?

newtonian-mechanics forces centrifugal-force centripetal-force

apr 25 '12 at 9:33 Qmechanic♦ 17.4k

1

2

votes

2

answers

289

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Why did they omit the action-reaction pair force in this problem?

homework newtonian-mechanics forces

dec 20 '11 at 15:20 orion 398

1

vote

2

answers

221

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Could someone remind me what this means again? $\nabla U = \pm F$

energy newtonian-mechanics forces potential-energy

mar 16 at 14:44 sybtc 46

1

vote

3

answers

330

views

Is this really how a capacitor works? Why doesn't it behave like a resistor?

electrostatics electric-circuits capacitance

feb 21 at 0:43 Emilio Pisanty 7,244

1

vote

2

answers

1

kviews

How do I properly use Newton's Third Law and Free Body Diagrams?

homework newtonian-mechanics free-body-diagram

dec 11 at 21:34 stupid 1

1

vote

0

answers

49

views

Temperature measurement, precision

homework thermodynamics

sep 11 at 3:34 jak 366

1

vote

1

answer

304

views

Non-conservative Electric Field

electromagnetism electricity electric-circuits resistors inductance

sep 7 at 11:02 Community♦ 1

1

vote

2

answers

258

views

How can a non-conservative field be a scalar multiple of a conservative field?

conservation-laws electric-field vector-fields inductance

aug 29 at 15:50 Alfred Centauri 5,744

1

vote

3

answers

105

views

Why is current not 0 in a regular resistor - battery circuit immediately after you closed a circuit?

electric-circuits resistors approximations scales

aug 28 at 10:12 Nic 3,009

1

vote

2

answers

134

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Can inductance or resistance be negative or “infinite”?

electric-circuits inductance

aug 11 at 13:23 Alfred Centauri 5,744

1

vote

1

answer

1

kviews

Two problems with free body diagrams. Contradictions (solutions are provided)

homework newtonian-mechanics forces friction free-body-diagram

jun 26 at 21:44 dmckee♦ 21.5k

1

vote

2

answers

395

views

Why does the light bulb's brightness decrease?

homework electric-circuits

may 16 '12 at 7:51 EnergyNumbers 2,404

1

vote

2

answers

448

views

A closed surface, no charge enclosed, yet flux not 0?

electromagnetism electric-field gauss-law

apr 30 '12 at 19:15 leongz 1,100

1

vote

1

answer

103

views

Why is the flux 0? I don't understand this concept

electrostatics gauss-law

apr 28 '12 at 0:38 tmac 1,129

1

vote

1

answer

394

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Why is static friction omitted here? And comparison with this problem on Newton's second Law. Solutions are all provided

newtonian-mechanics free-body-diagram

mar 23 '12 at 5:54 Community♦ 1

1

vote

2

answers

263

views

How could this damped oscillator ever go to infinity? Or negative infinity for that matter?

newtonian-mechanics spring oscillators

feb 7 '12 at 2:20 Qmechanic♦ 17.4k

2

1

vote

2

answers

467

views

Is there really no meaning in potential energy and potential?

electrostatics electric-field potential-energy

jan 3 '12 at 22:57 David Zaslavsky♦ 27.4k

1

vote

1

answer

269

views

What's the difference between arc length and signed distance?

kinematics

jan 1 '12 at 2:21 jak 366

0

votes

3

answers

654

views

Who is right? Force exerted on a body. Me or my friend?

homework newtonian-mechanics forces acceleration

apr 16 at 22:28 Brandon Enright 2,494

0

votes

1

answer

71

views

Thermal Expansion. Is there a way to fix my bottle?

thermodynamics

sep 28 at 6:19 John Rennie 44.4k

0

votes

2

answers

329

views

Capacitors in series

electrostatics capacitance

sep 16 at 14:56 Aaron 1

0

votes

0

answers

87

views

Coordinates in Equilibrium [closed]

thermodynamics statistical-mechanics

sep 11 at 22:06 jak 366

0

votes

0

answers

58

views

Resistor branding color. [closed]

power resistors

sep 8 at 22:59 jak 366

0

votes

1

answer

142

views

Gauss's Law in action

homework electrostatics gauss-law

aug 18 at 19:07 jak 366

0

votes

2

answers

345

views

Positive emf? What does positive emf mean?

electromagnetism maxwell-equations

aug 14 at 21:47 Magpie 298

jak

51 Questions