The diagram shows the field lines near the poles, x and y, of two magnets. answer x: north y: north

Alfred pushes on a heavy box, but cannot move it. the box has a lot of inertia motion friction gravity

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)

The energy released by a nuclear fusion reaction is produced when