One cubic meter (1.00 m) of aluminum has a mass of 2.70 10 kg, and the same volume of iron has a mass of 7.8610'kg. find the radus of a solid aluminum sphere that will balance a sod irn sphere o radu 14 squal-a balano rm

Radius of aluminium sphere which has same mass as of sphere of iron with radius 14 m is 40.745 meters.

Explanation:

Let the radius of aluminium sphere be

From the relation between density, mass and volume we know that

Applying equation 'i' separately to iron and aluminium sphere we get

Equating the masses of iron and aluminium spheres we get

the old price per ounce is c/4.

the new price per ounce is c/3.6.

the ratio of the old price to the new one is

(c/4)/(c/3.6) = (c/c)×(3.6/4) = 0.9 . . = 9/10 . . "nine tenths" in either form