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 Oct 4 awarded Yearling Apr 27 answered Why does ice melts, waits for 100 degrees and THEN vaporises? Why is not the process of expansion of things continuous? Oct 30 answered Why does the specific thrust of an ideal turbojet drop with increasing compressor pressure ratio? Oct 29 comment A satellite in orbit fires it's engines for a short interval. Is the new orbit closer or further away? @sheheryar-zaidi: Satellite has gravitational acceleration $g$ at each point of its trajectory. Orbit can be a circle when $\frac{v^2}{r}$ (inward acceleration of circular motion) equals $g$. Oct 28 answered A satellite in orbit fires it's engines for a short interval. Is the new orbit closer or further away? Oct 27 answered Interpretation of Free Damped Vibrations Oct 26 answered The Mysterious Reverb in a Jar of Hair Gel Oct 26 comment Cylinder rolling down slope problem @ja72: yes it is GeoGebra, nice tool Oct 26 answered Cylinder rolling down slope problem Oct 25 revised Intuitively, how can the work done on an object be equal to zero? proper term was used Oct 25 awarded Supporter Oct 25 answered Intuitively, how can the work done on an object be equal to zero? Oct 23 revised Understanding heat pump efficiency added computation of COP as requested by author of question Oct 21 answered Understanding heat pump efficiency Oct 13 answered Physical meaning of Impedance Oct 13 answered Why is charge $q$ symmetrically distributed? Oct 7 comment rotational oblateness If $\omega^2r$ is small but not insignificant - can $\omega^2r\cos^2(\phi)$ be omitted from the integral? Oct 7 revised rotational oblateness simplified, kept the essence Oct 7 comment rotational oblateness I meant centrifugal force at the equator (added to the answer). Centrifugal force at the equator is proportional to $\omega^{2}r$ and gravitational is proportional to $g$. Oct 7 revised rotational oblateness more precise wording