Question

The volume of a piece of metal is 70cm3. If the density of metal is 7.8 g/cm3, find the
mass of metal.
121​

Answer 1

Answer:

Since the shot-put is a solid sphere made of metal and its mass is equal to the product of its volume and density, we need to find the volume of the sphere.

Now, volume of the sphere =

3

4

πr

3

=

3

4

×

7

22

×4.9×4.9×4.9cm

3

=493cm

3

(nearly)

Further, mass of 1 cm

3

of metal is 7.8g

Therefore, mass of the shot-put =7.8×493g

=3845.44g=3.85kg (nearly)

Answer 2

Answer:

2.88 g is the correct answer