Answer
Verified
380.1k+ views
Hint: We will draw the diagram first from the given data to understand the problem. Then we are given the difference between the surfaces of the cylinder and the volume of the cylinder. We will consider the radius of the inner and outer cylinder as r and R respectively. The two data given will give two equations with the help of which we will find the value of radius and then the value of diameter.
Complete step-by-step answer:
Given that the solid shape is of a cylindrical pipe
This is the diagrammatic explanation. The orange part is the volume of the cylindrical pipe.
Now we know that the lateral surface area of the cylinder is given by the formula \[2\pi rh\].
We are given the difference in surface area is 88sq.cm. We can write it as
\[2\pi Rh - 2\pi rh = 88\]
Taking \[2\pi h\] common,
\[2\pi h\left[ {R - r} \right] = 88\]
Substituting the value of \[\pi \]and h we get,
\[2 \times \dfrac{{22}}{7} \times 14\left[ {R - r} \right] = 88\]
On calculating we get,
\[2 \times 22 \times 2\left[ {R - r} \right] = 88\]
\[\left[ {R - r} \right] = 1\]……equation (I)
Now we are given that the volume of the tube is 176 cubic cm.
So we know that the volume of the tube is the difference between the volume of the outer tube and the volume of the inner tube.
So volume of tube is given by \[\pi {r^2}h\]
\[\pi h\left[ {{R^2} - {r^2}} \right] = 176\]
Substituting the values of \[\pi \] and h,
\[\dfrac{{22}}{7} \times 14\left[ {{R^2} - {r^2}} \right] = 176\]
On solving we get,
\[\left[ {{R^2} - {r^2}} \right] = 4\]
We can expand the LHS as,
\[\left( {R + r} \right)\left( {R - r} \right) = 4\]
But from equationI we can substitute one of the brackets as,
\[\left( {R + r} \right) = 4\]……equation (II)
Now on solving (adding) equation (I) and (II) we get,
\[2R = 5\]
Thus value of $R$ is
\[R = 2.5\]
To find the value of r we will use the equation above,
\[r = R - 1\]
Putting the values we get,
\[r = 2.5 - 1\]
\[r = 1.5\]
This is the radius of the inner cylinder pipe. Then the diameter of the same will be double the radius.
\[d = 2r = 2 \times 1.5 = 3\;cm\]
This is our required answer.
The inner diameter of the tube is 3 cm.
Note: Here note the key point in solving the problem is the equation we design. That is the difference in the surface areas and the volume of the cylinder. But we should know that the volume of the ring cylinder is formed. So we have removed the volume of the inner cylinder from the volume of the outer cylinder.
Also note that the dimension is specifically asked in cm. Here they have given all the dimensions already in cm but if not given be careful in that matter.
Complete step-by-step answer:
Given that the solid shape is of a cylindrical pipe
This is the diagrammatic explanation. The orange part is the volume of the cylindrical pipe.
Now we know that the lateral surface area of the cylinder is given by the formula \[2\pi rh\].
We are given the difference in surface area is 88sq.cm. We can write it as
\[2\pi Rh - 2\pi rh = 88\]
Taking \[2\pi h\] common,
\[2\pi h\left[ {R - r} \right] = 88\]
Substituting the value of \[\pi \]and h we get,
\[2 \times \dfrac{{22}}{7} \times 14\left[ {R - r} \right] = 88\]
On calculating we get,
\[2 \times 22 \times 2\left[ {R - r} \right] = 88\]
\[\left[ {R - r} \right] = 1\]……equation (I)
Now we are given that the volume of the tube is 176 cubic cm.
So we know that the volume of the tube is the difference between the volume of the outer tube and the volume of the inner tube.
So volume of tube is given by \[\pi {r^2}h\]
\[\pi h\left[ {{R^2} - {r^2}} \right] = 176\]
Substituting the values of \[\pi \] and h,
\[\dfrac{{22}}{7} \times 14\left[ {{R^2} - {r^2}} \right] = 176\]
On solving we get,
\[\left[ {{R^2} - {r^2}} \right] = 4\]
We can expand the LHS as,
\[\left( {R + r} \right)\left( {R - r} \right) = 4\]
But from equationI we can substitute one of the brackets as,
\[\left( {R + r} \right) = 4\]……equation (II)
Now on solving (adding) equation (I) and (II) we get,
\[2R = 5\]
Thus value of $R$ is
\[R = 2.5\]
To find the value of r we will use the equation above,
\[r = R - 1\]
Putting the values we get,
\[r = 2.5 - 1\]
\[r = 1.5\]
This is the radius of the inner cylinder pipe. Then the diameter of the same will be double the radius.
\[d = 2r = 2 \times 1.5 = 3\;cm\]
This is our required answer.
The inner diameter of the tube is 3 cm.
Note: Here note the key point in solving the problem is the equation we design. That is the difference in the surface areas and the volume of the cylinder. But we should know that the volume of the ring cylinder is formed. So we have removed the volume of the inner cylinder from the volume of the outer cylinder.
Also note that the dimension is specifically asked in cm. Here they have given all the dimensions already in cm but if not given be careful in that matter.
Recently Updated Pages
what is the correct chronological order of the following class 10 social science CBSE
Which of the following was not the actual cause for class 10 social science CBSE
Which of the following statements is not correct A class 10 social science CBSE
Which of the following leaders was not present in the class 10 social science CBSE
Garampani Sanctuary is located at A Diphu Assam B Gangtok class 10 social science CBSE
Which one of the following places is not covered by class 10 social science CBSE
Trending doubts
Which are the Top 10 Largest Countries of the World?
How do you graph the function fx 4x class 9 maths CBSE
The Equation xxx + 2 is Satisfied when x is Equal to Class 10 Maths
Fill the blanks with the suitable prepositions 1 The class 9 english CBSE
In Indian rupees 1 trillion is equal to how many c class 8 maths CBSE
Difference between Prokaryotic cell and Eukaryotic class 11 biology CBSE
One Metric ton is equal to kg A 10000 B 1000 C 100 class 11 physics CBSE
Why is there a time difference of about 5 hours between class 10 social science CBSE
Give 10 examples for herbs , shrubs , climbers , creepers