NCERT Solutions 10th Maths Chapter 13 Surface Areas and Volumes Exercise 13.5

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Exercise 13.5
1.A copper wire, 3 mm in diameter, is wound about a cylinder whose length is 12 cm, and diameter 10 cm, so as to cover the curved surface of the Cylinder. Find the length and mass of the wire, assuming the density of copper to be 8.88 g per cm.
Solution:


2.An oil funnel made of tin sheer consists of a 10 cm long cylindrical portion attached to a frustum of a cone. If the total height is 22 cm, diameter of the cylindrical portion is 8 cm and the diameter of the top of the funnel is 18 cm, find the area of the tin sheet required to make the funnel.

Solution: