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CBSE Class 9 Answered

A copper wire of diameter 6mm evenly wrapped around on a cylinder of length 15cm and diamter 49cm to cover its whole surface. find the length and volume of the wire. if the specific gravity of copper is 9g per cu.cm, find the weight of the wire
Asked by bis0584 | 03 Feb, 2015, 01:56: PM
answered-by-expert Expert Answer
Diameter comma space straight d equals space 6 space mm equals 0.6 cm Radius space of space the space wire equals 0.3 space cm Length space of space cylinder comma space straight h equals 15 space cm Diameter space of space cylinder comma space straight d equals space 49 space cm Radius space of space cylinder comma space straight r equals space 49 over 2 cm Number space of space rotations space on space the space cylinder equals fraction numerator 15 over denominator 0.6 end fraction equals 25 Base space circumference space of space the space cylinder space equals 2 πr equals 2 cross times 22 over 7 cross times 49 over 2 equals space 154 space space cm Therefore comma space length space of space the space wire equals 154 cross times 25 equals 3850 space cm Volume space of space the space wire equals πr squared straight h equals 22 over 7 cross times 0.3 cross times 0.3 cross times 3850 equals 108.9 space cm cubed Weight space of space the space wire equals Volume cross times density space space equals 108.9 cross times 9 equals 980.1 space gm
Answered by Prasenjit Paul | 03 Feb, 2015, 04:19: PM

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CBSE 9 - Maths
25 The "Caring old people organisation"  needs money to build the old age home which requires 164000 bricks.  Bricks measure 10 cm8 cm 4 cm and cost of brick depends on its volume at the rate of ` 1 per 100 cm3.  It requires 4 cylindrical cans of paint of radius 14 cm and height 30 cm.  The cost of paint is ` 1 per 20 cm3.  How much money is required by organisation ?  If “A company gives the money to organization” then, what common value is depicted by A company and organisation.
Asked by harshsejal.83 | 16 Feb, 2023, 03:36: PM
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CBSE 9 - Maths
the perimeter of the base of a right circular cylinder is 88 cm and it's height is 10cm then its volume is
Asked by remsindi | 18 Jul, 2021, 06:11: PM
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CBSE 9 - Maths
From a cylindrical wooden log of length 30 cm and base radius 7 root 2 cm, biggest cuboid of square base is made. Find the volume of wood wasted.
Asked by ayushsuukla987 | 31 Dec, 2020, 10:45: AM
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CBSE 9 - Maths
A cube of copper edge 11cm is melted and formed into a cylindrical wire of diameter 0.5cm. what length of wire will be obtained from the cube
Asked by agentdevil1818 | 03 Mar, 2020, 05:27: PM
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CBSE 9 - Maths
A patient in a hospital is given soup daily in a cylindrical bowl of diameter 7 cm .If the bowl is filled with soup to a height of 4 cm ,how much soup the hospital has to prepare daily to serve 250 patients ?
Asked by Sourabh2002yadav | 13 Nov, 2018, 04:07: PM
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CBSE 9 - Maths
The circumference of the base of a cylindrical vessel of height 28 cm is 352 cm. Find the amount of water it can hold.
Asked by Topperlearning User | 13 Oct, 2017, 01:47: PM
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CBSE 9 - Maths
A rectangular piece of paper 33 cm long and 16 cm wide is rolled along its breadth to get a cylinder of height 16 cm. Find the volume of the cylinder.
Asked by Topperlearning User | 13 Oct, 2017, 01:52: PM
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CBSE 9 - Maths
A cylindrical vessel of diameter 84 cm and height 18 cm contains milk. This milk is to be filled in cylindrical tumblers of radius 7 cm and height 6 cm. Find the number of tumblers that can be filled with milk.
Asked by Topperlearning User | 13 Oct, 2017, 02:14: PM
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CBSE 9 - Maths
A solid rectangular block of iron of dimensions 7 cm x 4 cm x 2.75 cm is recast into a cylinder of radius 7 cm. Find the height of the recast cylinder.
Asked by Topperlearning User | 26 Oct, 2017, 11:52: AM
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CBSE 9 - Maths
A cylindrical bucket of diameter 28 cm and height 12 cm is full of water. The water is emptied into a rectangular tub of length 66 cm and breadth 28 cm. Find the height to which water rises in the tub.  
Asked by Topperlearning User | 13 Oct, 2017, 01:56: PM
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