Question

15. A piece of ductile metal is in the form of a cylinder of diameter 1 cm and length 11 cm. It is
drawn out into a wire of diameter 1 mm. What will be the length of the wire so obtained?
16. A solid cube of metal each of whose sides measures 2.2 cm is melted to form a cylindrical
wire of radius 1 mm. Find the length of the wire so obtained.
17. How many cubic metres of earth must be dug out to sink a well which is 20 m deep and has
a diameter of 7 metres? If the earth so dug out is spread over a rectangular plot 28 m by
11 m, what is the height of the platform so formed?
18. A well of inner diameter 14 m is dug to a depth of 12 m. Earth taken out of it has been evenly
spread all around it to a width of 7 m to form an embankment. Find the height of the
embankment so formed.
volume of earth taken out
Hint. Required height
Tex|(14)2 – (7)91
19. A road roller takes 750 complete revolutions to move once over to level a road. Find the
area of the road if the diameter of the road roller is 84 cm and its length is 1 m. solve all 15 to 19​

Answer 1

Answer:

Hey! These are sooo many questions

Step-by-step explanation:

But, here is the 19 one

All the other questions are from R S AGGRAWAL so u can google the solutions

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