A house cleaning service claims that it can clean a four-bedroom house in less than 2 hours. A sample of n = 36 houses is taken and the sample mean is found to be 1. 97 hours and the sample standard deviation is found to be 0. 1 hours. Using a 0. 05 level of significance the correct conclusion is.

The diagram shows a series of volcanic island and a hot spot determine the direction of movement of the tectonic plate that for the island

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 the difference between mass density and weight density?