Mr. finnigan has a particular proclivity for pyrotechnics. he will use right circular cylinders with a height of 12.0 cm and a radius of 11.6 cm. if the density of his powder is 8.41 g/cm3 , how many grams of powder does he need to stop the snatchers from getting to hogwarts if he needs 14 of these cylinders? express your answer in kg.

Molten iron fills a mould, which has a volume of 200 cm cubed. calculate the volume when the iron cools and solidifies. molten iron has a density of 7.0g/cm cubed. in its solid state, iron has a density of 8.0g/cm cubed.

Starting with only the balmer series light (visible light), how could we ensure that the solar panels generate a current that mark can use for his power station? a)by gradually increasing the brightness (amount) of light that we shine on it. b)by gradually increasing the frequency of the light we shine on it. c)by gradually increasing the wavelength of the light that we shine on it.

An object weighs 40n in air, weighs 20n when submerged in water and 30n when submerged in a liquid of unknown density. what is the density of the liquid?