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 one year ago
Four rods of equal mass m each , Ab , BC , CA , DB are placed as shown. The moment of inertia of the system about B perpendicular to the plane ABC is (AB=a)
 one year ago
Four rods of equal mass m each , Ab , BC , CA , DB are placed as shown. The moment of inertia of the system about B perpendicular to the plane ABC is (AB=a)

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JamesJ
 one year ago
Best ResponseYou've already chosen the best response.0Obviously break down the problem rod by rod.

JamesJ
 one year ago
Best ResponseYou've already chosen the best response.0And if you're really stuck, you're just going to integrate rod by rod.

shubhamsrg
 one year ago
Best ResponseYou've already chosen the best response.1Its basically a maths ques, you just need to find rod lengths, after doing that you just have to calculate moment of inertia of each rod about B and add all

Yahoo!
 one year ago
Best ResponseYou've already chosen the best response.0Yup . i Have Calculated the length of rods BC = a/sqrt(2) , AC = a/sqrt(2) , DB = (sqrt2) * a / sqrt3

shubhamsrg
 one year ago
Best ResponseYou've already chosen the best response.1won' that be (2/9)ma^2

shubhamsrg
 one year ago
Best ResponseYou've already chosen the best response.1dw:1360246728479:dw

Yahoo!
 one year ago
Best ResponseYou've already chosen the best response.0I (DB) = M L^2 / 3 * sin^2 30 ryt ?

shubhamsrg
 one year ago
Best ResponseYou've already chosen the best response.1I don;t think angle matters

shubhamsrg
 one year ago
Best ResponseYou've already chosen the best response.1For calculation of I,

shubhamsrg
 one year ago
Best ResponseYou've already chosen the best response.1Because the axis is perpendicular to plane, the rod will make 90 degrees with the axis, doesn't matter how it is placed.

shubhamsrg
 one year ago
Best ResponseYou've already chosen the best response.1Do you have the final ans ?

shubhamsrg
 one year ago
Best ResponseYou've already chosen the best response.1<Lets see if we get that by my method>

shubhamsrg
 one year ago
Best ResponseYou've already chosen the best response.1And AC = ma^2/6 + 3ma^2/6 = 2ma^2 /3

shubhamsrg
 one year ago
Best ResponseYou've already chosen the best response.1So sum = ma^2 (2/3 + 2/9 + 1/6) = 19/18ma^2

shubhamsrg
 one year ago
Best ResponseYou've already chosen the best response.1hmm, okay doesn't match

Yahoo!
 one year ago
Best ResponseYou've already chosen the best response.0i think that angle matters

shubhamsrg
 one year ago
Best ResponseYou've already chosen the best response.1AB = ma^2 /3 Sum = 25/18

Yahoo!
 one year ago
Best ResponseYou've already chosen the best response.0But Hw Did u Claculate I (AC) ??

shubhamsrg
 one year ago
Best ResponseYou've already chosen the best response.1calculate about C, then B

shubhamsrg
 one year ago
Best ResponseYou've already chosen the best response.1"Angle will not matter here" ;)
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