Does the amount of mass entering a control volume have to be equal to the amount of mass leaving during an unsteady-flow process?

Explain how the energy of rubber ball is tranforned as it roll down a ramp. give evidence that the energy of the og the ball remains the same at all points on the ramp

A10nc charge sits at a point in space where the magnitude of the electric field is 1500 n/c. what will the magnitude of the field be if the 10 nc charge is replaced by a 20 nc charge? assume the system is big enough to consider the charges as small test charges.

Why are nonmetals more likely to react with eachother by sharing electrons