2018-10-01_Physics_For_You

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2.


Uniform circular disc of
mass M and radius R

(i) about an axis passing through centre
and perpendicular to its plane

1
2

MR^2 R
2

(ii) about a diameter

1
4

MR^2
R/ 2

(iii) about a tangent in its own plane

5
4

MR^25
2

R

(iv) about a tangent perpendicular to its
own plane

3


2


MR^23


2

R

3.


Solid sphere of radius R
and mass M

(i) about its diameter

2


5


MR^22


5


R


(ii) about a tangential axis

7


5


MR^27


5


R


4.


Hollow sphere of radius R
and mass M

(i) about its diameter

2


3


MR^22


3


R


(ii) about a tangential axis

5


3


MR^25


3


R


5.


Solid cylinder of length l,
radius R and mass M

(i) about its own axis

1


2


MR^2 R


2

(ii) about an axis passing through centre
of mass and perpendicular to its own axis M

lR^22
12 4

+










lR^22
12 4

+


(iii) about the diameter of one of the faces
of cylinder M

lR^22
34

+










lR^22
34

+



  1. Hollow cylinder of mass
    M and radius R


(i) about its own axis MR^2 R
(ii) about an axis passing through its
centre of mass and perpendicular to its
own axis

M


Rl^22
212

+








Rl^22
212

+



  1. in rod of length L


(i) about an axis through centre of mass
and perpendicular to the rod

ML^2


12


L


12


(ii) about an axis through one end and
perpendicular to rod

ML^2


3


L


3



  1. Rectangular lamina of
    length l and breadth b


about an axis passing through its centre of
mass and perpendicular to plane M

lb^22
12

 +









lb^22
12

+


9.


Uniform cone of radius R
and height h

about an axis through its centre of mass
and joining its vertex to centre of base

3


10


MR^2


R


3


10


10.


Parallelopiped of length
l, breadth b and height h,
mass M

about its central axis M lb

22
12

 +





lb^22
12

+
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