Question

A Rectangular metal block measuring
10cm x 5.0cm x2.0cm.
Its mass is 250g. what is density
of the metal?
​

Answer 1

Answer:

he density is

1.1

g

c

m

3

. See explanation.

Explanation:

The density of a substance can be calculated using:

d

=

m

V

where

m

is the mass, and

V

is the volume.

Here we do not have the volume given, however we can calculate volume by multiplying given dimensions:

V

=

3

⋅

4

⋅

6

=

72

c

m

3

So the density is:

d

=

80

72

=

1

1

9

g

c

m

3

To answer the question stated in the last sentence we have to compare the calculated density of the piece of wood with the density of water.

Water has density of

d

W

=

1

g

c

m

3

Since the density of the wood is greater than the density of water, it will NOT float in the water.

Answer 2

density = mass/volume

= 250/1000/10*5*2

= 250/1000*100

= 250*10^-5

= 2.5*10^-7 kg/cm^3