A liquid of density 4.8 × 103 kg/m3 is contained in a cylinder of negligible mass,

base area 0.14 m2 and height of 0.28 m. The liquid completely fills the container.
a) What is the volume of the liquid?

b) What is the mass of the liquid?

c) What is the weight of the liquid?

d) What pressure does the liquid exert on the bottom of its container?

1 answer

Let's go through each part of the question step by step.

a) What is the volume of the liquid?

The volume \( V \) of a cylinder can be calculated using the formula:

\[ V = \text{Base Area} \times \text{Height} \]

Given:

  • Base Area \( A = 0.14 , \text{m}^2 \)
  • Height \( h = 0.28 , \text{m} \)

Substituting the values:

\[ V = 0.14 , \text{m}^2 \times 0.28 , \text{m} = 0.0392 , \text{m}^3 \]

b) What is the mass of the liquid?

The mass \( m \) of the liquid can be calculated using the formula:

\[ m = \text{Density} \times \text{Volume} \]

Given:

  • Density \( \rho = 4.8 \times 10^3 , \text{kg/m}^3 \)

Substituting the values:

\[ m = 4.8 \times 10^3 , \text{kg/m}^3 \times 0.0392 , \text{m}^3 \approx 188.736 , \text{kg} \]

c) What is the weight of the liquid?

The weight \( W \) of the liquid can be calculated using the formula:

\[ W = m \times g \]

where \( g \) is the acceleration due to gravity (approximated as \( 9.81 , \text{m/s}^2 \)).

Substituting the values:

\[ W = 188.736 , \text{kg} \times 9.81 , \text{m/s}^2 \approx 1,848.36 , \text{N} \]

d) What pressure does the liquid exert on the bottom of its container?

The pressure \( P \) exerted by the liquid at the bottom of the container can be calculated using the formula:

\[ P = \frac{W}{A} \]

where \( A \) is the area of the base.

Since we already have the weight \( W \) (approximately 1848.36 N) and the area \( A = 0.14 , \text{m}^2 \):

\[ P = \frac{1848.36 , \text{N}}{0.14 , \text{m}^2} \approx 13,202.57 , \text{Pa} , \text{(Pascals)} \]

In summary:

  • a) Volume of the liquid: \( 0.0392 , \text{m}^3 \)
  • b) Mass of the liquid: \( \approx 188.736 , \text{kg} \)
  • c) Weight of the liquid: \( \approx 1,848.36 , \text{N} \)
  • d) Pressure exerted on the bottom: \( \approx 13,202.57 , \text{Pa} \)