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.

Total mass in kg will be 596.96 kg        

Explanation:

We have given height of the cylinders h = 12 cm

Radius r = 11.6 cm

Volume of the cylinders

Density

We know that mass = density × volume

So mass m

There are 14 such cylinders so total mass

c. newton's third law of motion

answer;

d. are made mostly of liquid

explanation;

-the general   composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.