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To explain it, we have to come up with a model for how more work is being conserved than we might guess. Consider a rod hinged to a...

Ok, so what velocity does that imply, assuming mechanical work is conserved?

##\frac {v}{2}## is not a length. Do you mean it falls with velocity ##v##? When the top has fallen by ##y##, say, how much GPE has...

In the r=0 limit, there are only two velocities and one of them is zero.

I believe this problem belongs to class that includes the chain fountain effect. In practice, it seems that when the link at the bottom...

Based purely on the text description, I think you are supposed to treat O and A as the same point. Or was the diagram provided? The...

This solution was already posted in posts #2 and #3.

Suppose we look at the situation after both have tossed n coins and say that they have equal probabilities for every number of heads...

Yes, very neat, but might not be clear to all. A bit of elaboration might help… After n tosses each, - A has more heads than B with...

Mostly, yes. An awkward exception is kinetic friction. When writing, say, ##\mu mg\sin(\theta)## in an equation, the sign matters and...

I phrased it as I did to avoid to avoid getting tangled up with the question of which way the heat flows. Otherwise it might smell like...

Well, this is interesting. At e.g. https://en.wikipedia.org/wiki/Relative_velocity I read "The relative velocity of an object B with...

I don’t get the analogy. If East is defined as the side the Sun has always risen in recorded history, where a 'side' is defined by...

The question is the speed of the fly as perceived by an observer in the carriage. We can simplify it by first making the fly stationary...

Clearly that is not the case. If you were to place two inert bodies in contact and observe the result that the warmer body grows warmer...