A block of metal of mass 40kg requires a horizontal force of 100N to drag it with a uniform velocity along a horizontal surface. Calculate the coefficient of friction between the surfaces​

Which statement best describes how private industry decides where to spend the money on research and development

The heliocentric and the geocentric models of the solar system included these central principles

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)