Answer:
693 kg
Step-by-step explanation:
Volume of cylinder:
Height = 2.8 m = 280 cm³.
Diameter d = 20 cm.
Radius = d/2 = 10 cm.
Volume of cylinder = πr²h
= (22/7) * (10)² * 2.8
= 88000 cm³.
Volume of cone:
Height h = 42 cm.
Radius r = 10 cm.
Volume of cone = (1/3) πr²h
= (1/3) * (22/7) * (10)² * 42
= 4400 cm³.
Volume of pillar:
Volume of cylinder + Volume of Cone
= 88000 + 4400
= 92400 cm³
Given that Weight of 1 cm³ of iron = 7.5 g.
Weight of pillar = 7.5 * 92400
= 693000 g
= 693 kg
Hope it helps!
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Answers & Comments
Verified answer
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Here , the value of is taken 3.14.
If the value of = is taken, then the answer will be 930 kg.
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Verified answer
Answer:
693 kg
Step-by-step explanation:
Volume of cylinder:
Height = 2.8 m = 280 cm³.
Diameter d = 20 cm.
Radius = d/2 = 10 cm.
Volume of cylinder = πr²h
= (22/7) * (10)² * 2.8
= 88000 cm³.
Volume of cone:
Height h = 42 cm.
Radius r = 10 cm.
Volume of cone = (1/3) πr²h
= (1/3) * (22/7) * (10)² * 42
= 4400 cm³.
Volume of pillar:
Volume of cylinder + Volume of Cone
= 88000 + 4400
= 92400 cm³
Given that Weight of 1 cm³ of iron = 7.5 g.
Weight of pillar = 7.5 * 92400
= 693000 g
= 693 kg
Hope it helps!