An engine absorbs 1749 j from a hot reservoir and expels 539 j to a cold reservoir in each cycle. a. what is the engine’s efficiency? b. how much work is done in each cycle? c. what is the power output of the engine if each cycle lasts for 0.305 s?

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)

Abar magnet cut in half will form a total ofpoles.a)fourb)eightc)two

Asynthetic fiber used in manufacturing carpet has tensile strength that is normally distributed with mean 75.5 psi and standard deviation 3.5 psi. how is the standard deviation of the sample mean changed when the sample size is increased from n equals 8 to n equals 47