Mechanical Engineering - Engineering Mechanics - Discussion
Discussion Forum : Engineering Mechanics - Section 1 (Q.No. 43)
43.
Moment of inertia of a hollow circular section, as shown in the below figure about X-axis, is
Discussion:
10 comments Page 1 of 1.
Scientist atanu said:
4 years ago
Ixx and Iyy = (π/64 )*(D^4 - d^4) for hollow circular shaft.
Ixx and Iyy = πD^4/64. and Izz=πD^4/32.
Ixx and Iyy = πD^4/64. and Izz=πD^4/32.
Anup Singh Biswakarma said:
7 years ago
Moment about z-axis = (moment about x-axis + moment about y-axis).
Since moment about x-axis = moment about y-axis.
moment about z-axis = 2(moment about x-axis).
Therefore, moment about x-axis = (moment about z-axis)/2.
And as we know moment about z-axis = πD^4/32
Therefore for a circular section moment about x-axis = πD^4/64.
Since moment about x-axis = moment about y-axis.
moment about z-axis = 2(moment about x-axis).
Therefore, moment about x-axis = (moment about z-axis)/2.
And as we know moment about z-axis = πD^4/32
Therefore for a circular section moment about x-axis = πD^4/64.
(1)
VIJAY PRAJAPATI said:
8 years ago
The answer is right D. I agree.
Bhoopathi said:
8 years ago
MOI of solid shaft is πD^4/32, Then it should be π(D^4-d^4)/32.
Valak said:
8 years ago
Option D is correct.
Samir said:
9 years ago
Please explain it by numerically.
Dhaval said:
9 years ago
Answer is correct because it is not indicated that the perpendicular of an axis if it telling that a perpendicular to axis then answer C.
Prathamesh K said:
9 years ago
The answer is D, the moment of inertia about an axis in the plane is D.
While the moment of inertia about an axis perpendicular to the plane and passing through the centre would be C.
While the moment of inertia about an axis perpendicular to the plane and passing through the centre would be C.
Kiran said:
9 years ago
Yes, the answer should be c.
D rahul said:
9 years ago
I think the correct answer is c.
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