B. Lex Luthor has a piece of kryptonite that measures W=3.0 cm by L=6.0 cm by H=4.0 cm has a mass of 80.0 grams. What is the density of the kryptonite?
Would the piece of that float in water? Why?
(volume = L x W x H) (water density = 1g/cm3)

1.11g/cm³

It will sink

Explanation:

Given parameters:

Dimension of the kryptonite:

    W = 3cm

     L  = 6.0cm

     H = 4.0cm

Mass  = 80g

Unknown:

Density of the kryptonite = ?

Solution:

The density of a substance is its mass per unit volume;

 Density  =  

 Now let us find the volume;

 Volume  = L x W x H  = 3 x 6 x 4 = 72cm³

So;

    Density  =  = 1.11g/cm³

The substance will not float in water because its density is greater than that of water. It will sink in water.

10 years is the answer