Test Index

Volumes Practice Test 1

Question : 10 of 40

Marks: +1, -0

\text{kg/m}^3

Solution: 👈: Video Solution

Concept:

Use the volume of the beam and the given weight per unit volume to find its weight.

Explanation:

First, convert thickness and height into metres.

22.5 \text{ cm} = 0.225 \text{ m}

20 \text{ cm} = 0.20 \text{ m}

Volume of the beam is:

V = 9 \times 0.225 \times 0.20

V = 0.405 \text{ m}^3

Weight of the beam is:

W = 0.405 \times 50

W = 20.25 \text{ kg}

Answer:

The weight of the beam is

\boxed{20.25 \text{ kg}}

, so the correct option is A.

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