Ask a Doubt
Request a call back

Join NOW to get access to exclusive study material for best results

CBSE Class 8 Answered

A hollow cylindrical pipe is made of copper.the volume of the metal used in the pipe is 2640 cubic cm.its external radius is 7 cm and length is 21 cm .find the thickness of the pipe
Asked by ajayrath7 | 26 Dec, 2017, 08:24: PM
answered-by-expert Expert Answer
begin mathsize 16px style Let space straight R space be space the space external space radius space of space straight a space pipe space and space straight r space be space the space inetrnal space radius space of space straight a space pipe. straight R equals 7 space cm straight h equals 21 space cm Volume space of space hollow space cylinder equals πh open parentheses straight R squared minus straight r squared close parentheses 2640 equals 22 over 7 cross times 21 open parentheses 49 minus straight r squared close parentheses 2640 equals 66 open parentheses 49 minus straight r squared close parentheses On space simplifying space we space get space straight r equals 3 space cm Thickness space of space the space pipe equals straight R minus straight r equals 7 minus 3 equals space 4 space cm end style
Answered by Sneha shidid | 27 Dec, 2017, 10:40: AM

Application Videos

Concept Videos

Multiple Choice Questions Practice Test
Answered Unanswered My Questions My Answers
CBSE 8 - Maths
what is Euler's formula
Asked by praveenpk5903 | 31 Dec, 2019, 05:14: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 8 - Maths
Write the number of faces, vertices and edges in the following cuboids.
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 8 - Maths
Write the number of faces, vertices and edges of the below figure:
Asked by Topperlearning User | 13 Dec, 2013, 10:57: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 8 - Maths
Define prism and draw a rough diagram of triangular prism. Also verify the Euler's formula for the same.
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 8 - Maths
Define cylinder. Draw its rough diagram and write the number of faces and edges of it.
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 8 - Maths
The following shape is a hexagonal prism. Write the number of faces, vertices and edges. Also verify the Euler's formula.
Asked by Topperlearning User | 29 Nov, 2013, 12:53: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 8 - Maths
Write the name of 6 faces and 12 edges of the following cube.
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 8 - Maths
Using Euler's formula, find the unknown. (i) (ii) Faces x 5 Vertices 6 y Edges 12 9  
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 8 - Maths
Can a polyhedron have 10 faces, 20 edges and 15 vertices?
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 8 - Maths
What is Euler's formula? Verify the Euler's formula for a pentagonal prism.
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
My Class Videos Tests ₹ Plans Ask a Doubt
Get Latest Study Material for Academic year 24-25 Click here
×