6:23 AM
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I am trying to learn special relativity. If we consider two inertial reference frames with spacetime co-ordinates $(t,x,y,z)$ and $(t',x',y',z')$ and let there be 2 observers who measure the speed of light in their respective frames. Observer 1 would measure the speed of light as \$ \frac{|\Delta ...

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Suppose I have a disc that is in translational as well as rotational motion. Question 1: If we talk about the angular velocity of the disc, about which point is this angular velocity measured? (I mean to ask that is there any convention that if not mentioned angular velocity of a rigid body is th...

14 hours later…
8:42 PM
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Consider a rocket undergoing constant acceleration in a rectilinear path. Assuming the rocket is ideal (ignoring fuel mass and energy loss such as sound, radiation, vibration, etc.) a portion of the expended energy increases the rocket's kinetic energy, while the remainder becomes the kinetic ene...

9:25 PM
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Edit: I have realised my mistake. The part of text I read assumed the light to be monochromatic and so on that case there will be no difference between intensity and number of photons because the frequency remains same. Thanks to @planetmaker Anyway here's the original question: Any textbook I ha...