Cell membranes contain channels that allow Na + ions to rush in. Consider a channel that has a diameter of 2.56 nm and a length of 13.0 nm. If the channel has a resistance of 18.5 G Ω , what is the resistivity rho of the solution in the channel?

What color would an object that reflects green and blue light appear to be in white light? a. blue b. cyan c. magenta d. black

Gasoline comes from petroleum, which is made from ancient living things. petroleum, therefore, contains a type of energy. a. heat b. nuclear c. biological d. chemical potential

(a) calculate the number of electrons in a small, electrically neutral silver pin that has a mass of 10.0 g. silver has 47 electrons per atom, and its molar mass is 107.87 g/mol. (b) imagine adding electrons to the pin until the negative charge has the very large value 1.00 mc. how many electrons are added for every 109 electrons already present