Monday, February 3, 2020

classical mechanics - Moment of a force about a given axis (Torque) - Scalar or vectorial?

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I am studying Statics and saw that: The moment of a force about a given axis (or Torque) is defined by the equation: $M_X = (\vec r \times \...

quantum mechanics - Do the canonical commutation relations have any connection to geometry?

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I was wondering if the canonical commutation relations have any connection to geometry? If so, could you explain the connection in fairly s...

projectile - Could one fire a bullet with sufficient speed to leave the Earth?

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Consider a gun or rifle fired directly upwards. My original question was what speed would be required to escape the Earth. The escape veloci...
Sunday, February 2, 2020

velocity - Light traveling through a medium

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Does the frequency of light change when it travels across an interface between two media? What happens to the light wavelength and the light...

visible light - What is the trajectory of a photon moving through a vacuum?

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Since electromagnetic energy is carried by photons and moves in forms of waves, does it mean that a single photon when propagating through s...

electric circuits - On this infinite grid of resistors, what's the equivalent resistance?

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I searched and couldn't find it on the site, so here it is (quoted to the letter): On this infinite grid of ideal one-ohm resistors, wha...
Saturday, February 1, 2020

thermodynamics - Slow thermal equilibrium

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I have a question which is inspired by considering the light field coming off an incandescent lightbulb. As a blackbody radiation field, the...