A vacuum pump has a cylinder of volume 'v' and it is connected to a volume 'v' which pumped out air from the vessel P, calculate a. The reduced pressure after end stroke of the pump.
b. What number of strokes is needed to reduce the pressure from 2×10^5pa to 1×10^5pa, if the closed vessel has a volume of 2×10^-4m^3 and the pump cylinder is 2×10^-5m^3

Which governments provide garbage collection services to homes and businesses

Iron is a transition metal with multiple oxidation numbers. (answer the following) a. what is the iron (ii) ion? how does it differ from the iron (iii) ion? b. if iron were to bond with oxygen, predict the formula for each oxidation number of iron. c. how would each formula be named?

The great sandini is a 60.0-kg circus performer who is shot from a cannon (actually a spring gun). you don’t find many men of his caliber, so you him design a new gun. this new gun has a very large spring with a very small mass and a force constant of 1100 n/m that he will compress with a force of 4400 n. the inside of the gun barrel is coated with teflon, so the average friction force will be only 40.0 n during the 4.00 m he moves in the barrel. at what speed will he emerge from the end of the barrel, 2.50 m above his initial rest position?