User zh1

23 votes

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Why is the potential energy equal to the negative integral of a force?

answered Aug 1, 2016 at 14:59

22 votes

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Why do people say that Hamilton's principle is all of classical mechanics? How to get Newton's third law?

answered Jan 1, 2018 at 4:35

15 votes

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What is meant by multiplication in physics such as $s = v·t$?

answered May 22, 2020 at 12:38

14 votes

Microscopically, are all collisions really elastic collisions?

answered Sep 6, 2021 at 4:19

6 votes

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What is the formula for the intensity of light, and how are amplitude, frequency and number of photons considered?

answered May 17, 2018 at 3:07

5 votes

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Is Newton's third law due to inertia?

answered Apr 27, 2018 at 22:33

5 votes

Moment of Inertia

answered Aug 20, 2016 at 13:37

5 votes

How dose the factor $1/2$ in $E=\frac{1}{2} mv^2$ disappear in QM?

answered Aug 10, 2018 at 2:39

4 votes

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Why is the helmholtz free energy minimized?

answered Jun 14, 2018 at 0:17

4 votes

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What happens to the electric field and the potential difference in a capacitor when the distance between the plates is doubled?

answered Jun 20, 2018 at 20:23

4 votes

Derivation of the capacitance of a cylindrical capacitor

answered May 14, 2017 at 14:27

4 votes

Does applying $5\mathrm{N}$ force on a object for $2$ seconds mean applying $10\mathrm{N}$ force on that object?

answered May 15, 2020 at 18:27

4 votes

Which observer measures proper time in the twins paradox?

answered Nov 12, 2018 at 2:36

4 votes

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What is Magnetic Intensity?

answered Dec 22, 2018 at 15:59

3 votes

I was learning SHM and I came across equation $k = mw^2$

answered Jan 9, 2021 at 15:19

3 votes

How to derive a pendulum's motion without torque and angular momentum?

answered Dec 23, 2016 at 17:12

3 votes

Accepted

How to calculate the Sun’s energy output?

answered May 22, 2018 at 0:19

3 votes

Moment of inertia of a non uniform rod

answered Jun 4, 2018 at 2:37

3 votes

Sign of work done by friction

answered Jun 24, 2018 at 2:07

3 votes

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Why is sound produced when we hit a metal?

answered Jul 20, 2018 at 3:10

2 votes

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Determine velocity of balloon from known Buoyancy, mass and surface

answered Jul 24, 2018 at 1:13

2 votes

Potential inside a uniformly charged spherical shell

answered Jul 25, 2018 at 14:30

2 votes

Deriving torque from Euler-Lagrange equation

answered Jul 25, 2018 at 17:16

2 votes

How does energy flow in a circuit?

answered Aug 4, 2018 at 11:08

2 votes

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What is kinetic mass of photon?

answered Aug 5, 2018 at 14:11

2 votes

What does electrical potential at a point mean?

answered Aug 8, 2018 at 2:22

2 votes

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Vector units with different unit in each component

answered Jun 8, 2018 at 15:40

2 votes

Are zero heat exchange and zero work done synonymous to reversibility?

answered Jun 1, 2018 at 3:18

2 votes

Zero curl of magnetic field and Ampére's law

answered Jun 20, 2018 at 3:28

2 votes

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Conservation of Linear Momentum and absence of driving force

answered Jan 1, 2018 at 5:38

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95 Answers

Why is the potential energy equal to the negative integral of a force?

Why do people say that Hamilton's principle is all of classical mechanics? How to get Newton's third law?

What is meant by multiplication in physics such as $s = v·t$?

Microscopically, are all collisions really elastic collisions?

What is the formula for the intensity of light, and how are amplitude, frequency and number of photons considered?

Is Newton's third law due to inertia?

Moment of Inertia

How dose the factor $1/2$ in $E=\frac{1}{2} mv^2$ disappear in QM?

Why is the helmholtz free energy minimized?

What happens to the electric field and the potential difference in a capacitor when the distance between the plates is doubled?

Derivation of the capacitance of a cylindrical capacitor

Does applying $5\mathrm{N}$ force on a object for $2$ seconds mean applying $10\mathrm{N}$ force on that object?

Which observer measures proper time in the twins paradox?

What is Magnetic Intensity?

I was learning SHM and I came across equation $k = mw^2$

How to derive a pendulum's motion without torque and angular momentum?

How to calculate the Sun’s energy output?

Moment of inertia of a non uniform rod

Sign of work done by friction

Why is sound produced when we hit a metal?

Determine velocity of balloon from known Buoyancy, mass and surface

Potential inside a uniformly charged spherical shell

Deriving torque from Euler-Lagrange equation

How does energy flow in a circuit?

What is kinetic mass of photon?

What does electrical potential at a point mean?

Vector units with different unit in each component

Are zero heat exchange and zero work done synonymous to reversibility?

Zero curl of magnetic field and Ampére's law

Conservation of Linear Momentum and absence of driving force