10. A cylindrical metal rod of radius 6.3 m and length 90 cm is melted and
recast into a cylindrical rod of radius 5.6 cm. How long is the new rod?
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10. A cylindrical metal rod of radius 6.3 m and length 90 cm is melted and
recast into a cylindrical rod of radius 5.6 cm. How long is the new rod?
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Answer:
Volume of R1 = 6.3 * 6.3 * 22/7 * 90 = 11226.6cm³
New R2 or Rod has 5.6cm radius. hence Height will be V/r²π =
11226.6/5.6 * 5.6 * 22/7 = 113.90625cm³
Simple and Easy, Hope this helps !
Answer:
(I) l=1.5m, b=1.25m
Surface area=Lateral Surface area + Base area
=[2(l+b)h] +[l*b]
=5.45m2
(II) Total cost of required sheet = 20*5.45= ₹109
Hope this answer will help you