the volume of a metallic cylindrical pipe is 748 cm cube its length is 14 cm and its external radius is 9 cm find its thickness
Answers
Answered by
3
let internal radius be r
then
π*(9)²*14-π*r²*14=748
or 9²-r²=748/π*14
or r²=81-(748/44)
or r²=81-17
or r²=64
or r=8
then thickness of pipe is =9-8=1cm....(ans)
then
π*(9)²*14-π*r²*14=748
or 9²-r²=748/π*14
or r²=81-(748/44)
or r²=81-17
or r²=64
or r=8
then thickness of pipe is =9-8=1cm....(ans)
princelumar:
outstanding bro
Answered by
4
given length (h)= 14 cm
according to question ,
volume of cylindrical pipe = 748 cm^3
πr^2 h = 748
r^2= 748 × 7 /22× 14
r^2 = 748 /44
r^2 = 17
r = 4.1 cm
since, external radius = 9 cm
then, thickness of pipe
= 9 - 4.1 = 4.8 cm = 5cm( approximate )
_______________________________
Your answer : thickness = 4.8 cm
_______________________________
according to question ,
volume of cylindrical pipe = 748 cm^3
πr^2 h = 748
r^2= 748 × 7 /22× 14
r^2 = 748 /44
r^2 = 17
r = 4.1 cm
since, external radius = 9 cm
then, thickness of pipe
= 9 - 4.1 = 4.8 cm = 5cm( approximate )
_______________________________
Your answer : thickness = 4.8 cm
_______________________________
it is calculated as internal radius of pipe so we have to .
if have given volume of whole cylinder then no need to subtract volume of cylinder from external to internal. you just have to find internal radius because external radius already have given there.
radius is 4.1 cm
just take internal radius as r and put the formula of volume of cylinder - volume of cylinder
at google some website showing answer = 1 or some website showing answer = 4.8 but 4.8 is correct because already we have given external radius of pipe so we have just to find internal radius and have to subtracf it from external radius
radius is 8 cn
no by , no need to subtract two volumes , because external radius already given there which is = 9cm
answer is mentioned in my book as 1cm
and i also found it as 1cm
that is wrong answer in your book , plz use your brain
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