What are man-made levees made out of?

What are the dimensions of the cross section that passes through the points a, f, g, and d?

Which of the following statements correctly describes a transformer?

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?