I'm quite curious to know about this question. I don't really fully understand how inertia works so I couldn't quite put this one together in my head. As far as I know, if you are moving in empty space, you need a reference point if you want to determine how fast you are going. If you set the ref...

I'm thinking about the conditions needed for magnetostatics, in other words magnetic fields that do not change with time. My textbook says that this requires a steady, continuous current without any charge piling up anywhere, and that by the continuity equation the requirement for magnetostatics ...

When I fill a water bottle from a tap (aiming the flow from the tap so that it goes entirely into the bottle), if I time it correctly I can turn off the tap so that the bottle is filled right up to the brim. If I mistime it so that the water overflows, and then turn off the tap, the resulting lev...

Suppose I am sliding a block very slowly on a rough surface. If the block has travelled $d$ distance then work done by me is $W_1=\mu mg d$ and that by friction is $W_2=-\mu mg d$. Now the energy transferred from me to block is $\mu mgd$ and that taken by friction from block is $\mu mgd $, The ne...