How long would it take to pump water out of a cellar 2m and floor space 25m2?
Consider a loop, what height should the roller coaster start from if it is to make it around the loop?
Derive the electrostatic potential of a particle from Coulomb's Law
A bath tub can be filled in 10 minutes and emptied in 15. How long would it take to fill if the tap was on but there was no plug?
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