Timmy sits at the beach and reads a book. He notices the sounds if the waves and looks up to see the waves crashing softly on the warm shores. How can he find the frequency or oeriod of the waves.

What is tan(61)? а. 1.80 b. 0.49 c. 0.61 d. 0.87

Apebble is thrown into a calm lake, ripples are formed from the center and move outward. the water particles in the lake travel in a circular pattern that moves up and down on the surface of a lake, and the energy travels a) diagonally. b) downward. c) horizontally. d) upward.

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)