Peter teacher tells him that he should not place his electric stereo near the edge of the pool because the water in the pool is a conductor what does she mean when she says that the water is an conductor

Velocity is a description of both speed and direction, therefore it - a vector - a force arrow - the same as acceleration - a magnitude

The difference between a red shift and a blue shift has to do with wavelength frequency. t or f

Global warming will produce rising sea levels partly due to melting ice caps but also due to the expansion of water as average ocean temperatures rise. to get some idea of the size of this effect, calculate the change in length of a column of water 1.00 km high for a temperature increase of 1.00ºc. note that this calculation is only approximate because ocean warming is not uniform with depth. (answer in ×10^{-3} −3 m)