Which of the following situations correctly describes power? bill pushed a car for 5 minutes for 20-km while doing 15 j of work. sue does 27 j of work. maddi exerts a force of 45 n. alex exerted a force over 46 m.

Simple machines can a. increase force only b. decrease force only c. increase or decrease force

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)

Aheat engine that operates on a carnot cycle has an efficiency of 0.420 when its low-temperature reservoir is at 10 ∘c.part aby how many degrees celsius must you increase the temperature of the high-temperature reservoir to increase the efficiency to 0.600 if you continue to use the same low-temperature reservoir?