A block of density 2400 km/m3 has a volume of 0.20 m3 what is it's mass

Data:

D = 2400 kg/m³

V = 0.20 m³

M = ?

∴ Density =

2400 kg/ =

Mass = 2400 kg/m³ × 0.20 m³

Mass = 480 kg (answer)

Therefore, the mass of the block is 480 kg.

what experimental evidence led scientists to change from the previous model to this one?

a few of the positive particles aimed at a gold foil seemed to bounce back.

the colors of light emitted from heated atoms had very specific energies.

experiments with water vapor showed that elements combine in specific proportions.

cathode rays were bent in the same way whenever a magnet was brought near them.

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