A kid spins around in a chair 3 times every 1/4 minute. What is the period and frequency of this cycle? *
T = 15s, f = 0.6Hz
T = 5s, f = 0.2Hz
T = 15s, f = 0.2Hz
T = 5s, f = 0.6Hz

Ared apple is illuminated by a blue light the apple will appear

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)

Which compound is held together by the electrostatic force between two ions? a. co2 b. cci4 c. h2s d. mgf2