Bucket of water of mass 15 kg is pulled at constant velocity up to a platform 45 meters above the ground. This takes 18 minutes, during which time 3 kg of water drips out at a steady rate through a hole in the bottom. Find the work needed to raise the bucket to the platform. (Use g=9.8m/s2.)

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 (in m) of a column of water 1.45 km high for a temperature increase of 1.12°c. assume the column is not free to expand sideways. as a model of the ocean, that is a reasonable approximation, as only parts of the ocean very close to

The ability to make things happen is also called a. heat b. force c. matter d. energy

Petroleum contains energy. a. light b. kinetic c. chemical d. mechanical