As shown in the figure below, Felipe walks from the house to his truck on the way to work. He walks 20m to the truck and drives another 60m in his truck for a total time of 20 seconds What is Felipe’s average velocity over the entire 20 seconds period?. (Answer using a coordinate system where rightward is positive.)

Yvette hangs a 2.4kg bird feeder in the middle of a rope tied between two trees. the feeder creates a tension of 480 n in each side of the the rope.

Sound is a disturbance that travels through a medium as a

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)