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Rate of change in size:Moving Objects

Is there a way of calculating the rate at which an object decreases/increases in size relative to the observer.For example,if a bus(4m wide) is moving away from a stationary observer at the rate of ...
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Locus of a moving mass point

Two very small mass particles $m_1$, $m_2$ are connected by a $2l$ long, infinitely soft and inelastic thread without mass. The initial condition of the system before being freely released is as in ...
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Verification of Lenz's law in a magnetic induction

So the device is a Galvanometer. According to the Lenz's Law, when we take the magnet towards the coil, the pole at the right end, should be north pole and when we take it away, the pole should be ...
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Dynamic coefficient of friction

Is there any way or equation or table to find dynamice coefficient of friction between Aluminum and asbestos or steel with asbestos in wear test at various temperature,pressure and velocity ?...
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Laws of physics for a point in cyclical 2D motion

A follow up question to the question in What does the statement "the laws of physics are invariant" mean? and Formal definition of an observer? Which laws of physics are they talking about ...