An object is being swung with a centripetal force of 40 N on a length of rope. If the object weighs 4 kilograms and is moving with a tangential velocity of 18 m/s, how long is the rope?

Which statement correctly describes the relationship between frequency and wavelength?

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)

What is a subatomic particle with a negative charge and very little mass?