Asample is in the second half-life. what percent of the sample is stable at this point?

12.5%
25%
50%
75%

If a simple machine reduces the strength of a force, what must be increased?

Where is the potential energy throughout the loading, cocking, and releasing of the trebuchet?

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)