Question

an iron Cylindrical pole is 21 m high and its base radius is 14m . Find its weight if the iron weighs 350kg per cubic metre
please write correct ans wer
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Answer 1

Answer:

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Step-by-step explanation:

Given r===10 cm=0.1 m and h=7 m

But we know that volume of the cylinder =πr

2

h

V=22/7×0.1×0.1×7

V=0.22 m

3

Given the weight of the wood 225 kg per cubic meter

So, the weight of the pole =0.22×225=49.5 kg

Answer 2

Answer:

Given

• base radius of cylindrical pole= r = 14m
• height = h = 21m
• 1 cubic metre pole weight is 350kg

Volume of cylinder

$= \pi \: r {}^{2} h$

substituting the value of r and h

$\pi \: r {}^{2} h \\ = \frac{22}{7} \times 14 \times 14 \times 21 \\ = 22 \times 2 \times 14 \times 21 \\ = 12936m {}^{3}$

• 1 cubic metre pole weight is 350 kg

So,

the weight of 12,936kg is

= 12,936 X 250

= 45,27,600 kg