How much force will it take to lift 5kg in a pulley system

Maria wants to determine which type of disinfectant kills the most bacteria. which of the following is the best way for maria to determine this? a. ask ten different companies that make disinfectants which type is best. b. put the same amount and species of bacteria on ten identical plates, and add ten different kinds of disinfectant to each plate. c. interview ten different people to determine which type of disinfectant they prefer. d. put the same amount and species of bacteria on ten identical plates, and add a different disinfectant to each plate.

What are the first three quantum numbers for the electrons located in subshell 2s?

As changes in energy levels of electrons increase, the frequencies of atomic line spectra they emit