Question

An iron pillar consists of a cylindrical portion of 2.8 m. height and 20 cm. in diameter and a cone of 42 cm. height surmounting it. Find the weight of the pillar if 1cm3 of iron weighs 7.5 g.​

Answer 1

Answer:

693 kg

Step-by-step explanation:

Find the weight of the cylindrical portion:

Volume = πr²h

Volume = π(20 ÷ 2)²(280)

Volume = 28000π cm³

Find the volume of the cone:

Volume = 1/3 πr²h

Volume = 1/3 π(20 ÷ 2)²(42)

Volume = 1400π cm³

Find the total volume:

Volume = 28000π + 1400π

Volume = 29400π cm³

Volume = 92400 cm³

Find the weight:

1 cm³ = 7.5g

92400 cm³ = 92400 x 7.5

92400 cm³ = 693000g

92400 cm³ = 693 kg

Answer: The weight of the pillar is 693 kg

Answer 2

Answer:

Note: See Attachment for Answer!

Step-by-step explanation:

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