1
JEE Main 2019 (Online) 8th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
A thin circular plate of mass M and radius R has its density varying as $$\rho $$(r) = $$\rho $$0r with $$\rho $$0 as constant and r is the distance from its centre. The moment of Inertia of the circular plate about an axis perpendicular to the plate and passing through its edge is I = aMR2. The value of the coefficient a is :
A
$${1 \over 2}$$
B
$${3 \over 2}$$
C
$${8 \over 5}$$
D
$${3 \over 5}$$
2
JEE Main 2019 (Online) 12th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
A particle of mass 20 g is released with an initial velocity 5 m/s along the curve from the point A, as shown in the figure. The point A is at height h from point B. The particle slides along the frictionless surface. when the particle reaches point b, its angular momentum about O will be :
(Take g = 10 m/s2)

JEE Main 2019 (Online) 12th January Evening Slot Physics - Rotational Motion Question 144 English
A
6 kg-m2/s
B
8 kg-m2/s
C
2 kg-m2/s
D
3 kg-m2/s
3
JEE Main 2019 (Online) 12th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
The moment of inertia of a solid sphere, about an axis parallel to its diameter and at a distance of x from it, is 'I(x)'. Which one of the graphs represents the variation of I(x) with x correctly ?
A
JEE Main 2019 (Online) 12th January Evening Slot Physics - Rotational Motion Question 143 English Option 1
B
JEE Main 2019 (Online) 12th January Evening Slot Physics - Rotational Motion Question 143 English Option 2
C
JEE Main 2019 (Online) 12th January Evening Slot Physics - Rotational Motion Question 143 English Option 3
D
JEE Main 2019 (Online) 12th January Evening Slot Physics - Rotational Motion Question 143 English Option 4
4
JEE Main 2019 (Online) 12th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
Two particles A, B are moving on two concentric circles of radii R1 and R2 with equal angular speed $$\omega $$. At t = 0, their positions and direction of motion are shown in the figure. :

JEE Main 2019 (Online) 12th January Evening Slot Physics - Rotational Motion Question 142 English

The relative velocity $${\overrightarrow V _A} - {\overrightarrow V _B}$$ at t = $${\pi \over {2\omega }}$$ is given by :
A
$$ - \omega \left( {{R_1} + {R_2}} \right)\,\widehat i$$
B
$$\omega \left( {{R_2} - {R_1}} \right)\,\widehat i$$
C
$$\omega \left( {{R_1} + {R_2}} \right)\,\widehat i$$
D
$$\omega \left( {{R_1} - {R_1}} \right)\,\widehat i$$
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