Aptitude - Volume and Surface Area - Discussion
Discussion Forum : Volume and Surface Area - General Questions (Q.No. 5)
5.
A hollow iron pipe is 21 cm long and its external diameter is 8 cm. If the thickness of the pipe is 1 cm and iron weighs 8 g/cm3, then the weight of the pipe is:
Answer: Option
Explanation:
External radius = 4 cm,
Internal radius = 3 cm.
| Volume of iron |
|
||||||
|
|||||||
| = 462 cm3. |
cm3
Weight of iron = (462 x 8) gm = 3696 gm = 3.696 kg.
Discussion:
61 comments Page 2 of 7.
Manasa said:
10 years ago
Diameter d = 2r.
Gautam said:
9 years ago
Isn't weight=mass*gravity?
Ajay said:
9 years ago
Could you explain me about pi?
Utham said:
9 years ago
The Internal radius and external radius. given is 8g/cm^3 not for hollow space.So, the first find out the full volume that is with the use of external radius. Now subtract hollow space that volume with internal radius. R^2h*r^2h.
Suba sanjeev .m said:
9 years ago
I am not getting this, can you explain clearly?
Junaid said:
9 years ago
Why is the internal radius 3cm?
Ravi said:
10 years ago
Surface area of iron cube of side 10cm is?
Tomsy said:
10 years ago
Please, someone explain me by step by step.
Deepak M said:
9 years ago
Thank you all.
Nagi said:
10 years ago
Why diameter is converted into radius?
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