Question

1.A bunch of flower has a volume of 8cm-3 and a mass of 78g. What is its density in a) g/cm-3 b) kg/m-3
2.What is the mass of 7m-3 of rock of density 1986kg/m-3 ​

Answer 1

1.)

Given:

1. Volume of a bunch of flower = 8 cm³
2. Mass of a bunch of flower = 78 g

To find:

• Density of a bunch of flower.

Solution:

Density is nothing but the mass per unit volume of a substance.

It's S.I unit is kg.

♦ Density = Mass/Volume

Here,

Mass = 78 g

Volume = 8 cm³

Putting the values,

• Density = 78/8 g/cm³
• Density = 9.75 g/cm³

∴ Density of a bunch of flower = 9.75 g/cm³

2.)

Given:

• Volume of rock = 7 m³
• Density of rock = 1986 kg/m³

To find:

• Mass of rock.

Solution:

♦ Mass of rock = Density × Volume

Here,

Density = 1986 kg/m³

Volume = 7 m³

Putting the values,

• Mass of rock = 1986 × 7 m³ × kg/m³
• Mass of rock = 13,902 kg

Therefore, mass of rock = 13,902 kg

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