If you have to apply 40 n of force on a crowbar to lift a rock that weights 400 n, what is the actual mechanical advantage of the crowbar

The formation of a solid, also known as a is an indication of a chemical change. precipitate particulate particle powder

The content of manganese (mn) in steel was determined spectrophotometrically and with the use of the standard addition method. an unknown sample of mn from a digested steel sample gave an absorbance of 0.185 when analyzed spectrophotometrically. when 5.00 ml of solution containing 95.5 ppm mn was added to 50.0 ml of the unknown steel solution (digested sample), the absorbance was 0.248. calculate the concentration, in parts-per-million (ppm), of mn in the digested steel sample solution.

Which of the following are correct values for the ideal gas laws constant r