Question

a copper piece whose mass is 88gm and its volume is 10cm³. find its density in kg/m³.

don't give wrong answer​

Answer 1

➠ANSWER:

• Density = 8800 kg/m³

➠GIVEN:

◉Mass = 88 g

◉Volume = 10 cm³

➠TO FIND:

◉Density in kg/m³

➠CONVERSIONS:

1 g = 0.001 kg => 88 g = 0.088 kg

1 cm³ = 10^{-6}10 -⁶

m³ => 10 cm³ = 10^{-5}10 -⁶m³

➠FORMULA:

• DENSITY = MASS / VOLUME

➠EXPLANATION:

Density = 0.088/ {10}^{-5}10 -⁵

Density = 0.088 × {10}^{5}10 ⁵

Density = 8800 kg/m³

➠points to be noted....

• Density can also be expressed in g/cm³.
• g/cm³ is the CGS unit.
• Expressing density in g/m³ and kg/cm³ is often rare. As they are not standard form of expressing density.

Answer 2

Answer:

Given that,

Volume of body V=10

−4 m 3

Density of iron, ρ i

=7800kgm −3

Density of water ρw

=1000kgm

−3

Weight in air,W

a

=ρ

i

Vg=7800×10

−4

×10=7.8N

We know that,

Weight in water = weight in air – buoyancy force

W

w

=W

a −ρ

wVgWw

=7.8−1000×10 −4 ×10W w

=6.8N

Hence, the weight of body in water is 6.8 N