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17 Questions

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Kinematic equation as infinite sum

May 14 '20 at 20:54 Alex Ortiz 535

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Why are electrical units (specifically, electrical current) considered a base unit?

electric-current charge units si-units metrology

Aug 3 '17 at 9:20 Emilio Pisanty 116k

votes

answers

176

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Consistent nomenclature for $\mathbf{E}$-, $\mathbf{D}$-, $\mathbf{B}$-, $\mathbf{H}$-, $\mathbf{P}$-, and $\mathbf{M}$-fields [closed]

electromagnetism magnetic-fields electric-fields terminology conventions

Jun 26 '17 at 8:53 gen-ℤ ready to perish 548

votes

answer

118

views

Why do we need to define both luminous intensity and illuminance?

visible-light electromagnetic-radiation radiometry photometry

Apr 9 '18 at 4:24 Farcher 66.6k

votes

answer

129

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What assumptions would I have to make to rigorously prove power equals force dotted with velocity, $P=\mathbf{F}\cdot\mathbf{v}$?

newtonian-mechanics forces work velocity power

Mar 3 '18 at 18:52 Qmechanic♦ 145k

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answer

371

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How does one describe how a basis vector changes through space using the Christoffel symbols?

general-relativity special-relativity vectors relativity tensor-calculus

Dec 24 '17 at 23:55 Dr. Ikjyot Singh Kohli 1,322

votes

answer

views

Two different meanings of $\nabla$ with subscript?

notation differentiation vector-fields calculus

Jul 7 '17 at 22:14 CR Drost 31.3k

vote

answer

212

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How is the subjective loudness of sound computed?

acoustics perception

Jun 14 '18 at 20:33 gen-ℤ ready to perish 548

vote

answer

views

How does one categorize antiparticles in flavor, family and generation?

terminology standard-model antimatter leptons

Mar 3 '18 at 7:50 Qmechanic♦ 145k

vote

answer

151

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Is the matrix Lorentz transform equivalent to statements of time dilation, length contraction and effective mass?

special-relativity time-dilation

Dec 17 '17 at 10:08 JM1 807

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145

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Would Faraday’s law still hold?

electromagnetism

May 7 '17 at 9:42 Farcher 66.6k

vote

answers

120

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Why is the formula written this way?

electromagnetism notation

Apr 16 '17 at 23:29 Steeven 38.6k

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answer

views

Can this textbook question on angular magnification be answered without a ruler?

optics imaging

Mar 13 '20 at 7:10 Farcher 66.6k

votes

answers

241

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Base unit definition and realization under relativistic conditions

relativity si-units metrology

May 31 '17 at 12:44 gen-ℤ ready to perish 548

votes

answer

views

Electric field per permittivity

electromagnetism magnetic-fields electric-fields

May 6 '17 at 9:34 M. Hawk 161

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answers

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Mathematical relationship between escape speed and orbital speed

homework-and-exercises newtonian-mechanics newtonian-gravity orbital-motion escape-velocity

Jan 24 '17 at 22:13 gen-ℤ ready to perish 548

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answers

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Deriving $-dU/dr$

forces work potential-energy calculus

Oct 12 '16 at 5:37 Qmechanic♦ 145k

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17 Questions

Kinematic equation as infinite sum

Why are electrical units (specifically, electrical current) considered a base unit?

Consistent nomenclature for $\mathbf{E}$-, $\mathbf{D}$-, $\mathbf{B}$-, $\mathbf{H}$-, $\mathbf{P}$-, and $\mathbf{M}$-fields [closed]

Why do we need to define both luminous intensity and illuminance?

What assumptions would I have to make to rigorously prove power equals force dotted with velocity, $P=\mathbf{F}\cdot\mathbf{v}$?

How does one describe how a basis vector changes through space using the Christoffel symbols?

Two different meanings of $\nabla$ with subscript?

How is the subjective loudness of sound computed?

How does one categorize antiparticles in flavor, family and generation?

Is the matrix Lorentz transform equivalent to statements of time dilation, length contraction and effective mass?

Would Faraday’s law still hold?

Why is the formula written this way?

Can this textbook question on angular magnification be answered without a ruler?

Base unit definition and realization under relativistic conditions

Electric field per permittivity

Mathematical relationship between escape speed and orbital speed

Deriving $-dU/dr$