How are earthworms connected with soil fertility? a) they eat essential nutrients and reduce the fertility of the soil. b) they increase soil fertility by fixing nitrogen compounds in the soil. c) they increase soil fertility by converting dead leaves into rich humus. d) they convert minerals in the soil to compounds that are harmful to plants.

The material that keeps its new shape after it is stretched is called?

An insulated 40 ft^3 rigid tank contains air at 50 psia and 120°f. a valve connected to the tank is now opened, and air is allowed to escape until the pressure inside drops to 25 psia. the air temperature during this process is kept constant by an electric resistance heater placed in the tank. determine the electrical work done during this process.

(a) if the pressure in gas is doubled while its volume is held constant, by what factor do (i) vrms and (ii) change? (b) is it possible to boil water at room temperature (20oc) without heating it? explain.