1
JEE Main 2019 (Online) 9th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
An L-shaped object, made of thin rods of uniform mass density, is suspended with a string as shown in figure. If AB = BC, and the angle made by AB with downward vertical is $$\theta$$, thrown :

A
tan$$\theta$$ = $${1 \over {2\sqrt 3 }}$$
B
tan$$\theta$$ = $${1 \over 2}$$
C
tan$$\theta$$ = $${2 \over {\sqrt 3 }}$$
D
tan$$\theta$$ = $${1 \over 3}$$
2
JEE Main 2019 (Online) 9th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
If the angular momentum of a planet of mass m, moving around the Sun in a circular orbit is L, about the center of the Sun, its areal velocity is :
A
$${L \over m}$$
B
$${4L \over m}$$
C
$${L \over 2m}$$
D
$${2L \over m}$$
3
JEE Main 2018 (Online) 16th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
A thin circular disk is in the xy plane as shown in the figure. The ratio of its moment of inertia about z and z' axes will be :

A
1 : 3
B
1 : 4
C
1 : 5
D
1 : 2
4
JEE Main 2018 (Offline)
MCQ (Single Correct Answer)
+4
-1
Seven identical circular planar disks, each of mass M and radius R are welded symmetrically as shown. The moment of inertia of the arrangement about the axis normal to the plane and passing through the point P is :
A
$${{181} \over 2}M{R^2}$$
B
$${{55} \over 2}M{R^2}$$
C
$${{19} \over 2}M{R^2}$$
D
$${{73} \over 2}M{R^2}$$
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