Find the surface area of a copper sheet required to cover a semi spherical tomb of radius 7m
while the mass of 1m' of the sheet is 2kg. Also calculate the cost of the sheet at Rs. 300 per kg.
Answers
Answered by
0
answer 109
step by step explanation
Sol: (i) Here, l = 1.5 m, b = 1.25 m
∵ It is open from the top.
∵ Its surface area = [Lateral surface area] + [Base area]
= [2(l + b)h] + [l × b]
= [2(1.50 + 1.25)0.65 m2] + [1.50 × 1.25 m2]
= [2 × 2.75 × 0.65 m2] + [1.875 m2]
= 3.575 m2 + 1.875 m2 = 5.45 m2
∵ The total surface area of the box = 5.45 m2
∴ Area of the sheet required for making the box = 5.45 m2
(ii) Rate of sheet = Rs. 20 per m2
Cost of 5.45 m2 = Rs. 20 × 5.45
⇒ Cost of the required sheet = Rs.109
Similar questions
Math,
2 months ago
Math,
2 months ago
Science,
2 months ago
Computer Science,
5 months ago
Math,
9 months ago