1
WB JEE 2022
MCQ (Single Correct Answer)
+1
-0.25
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WB JEE 2022 Physics - Center of Mass Question 4 English

A particle is moving in an elliptical orbit as shown in figure. If $$\overrightarrow p $$, $$\overrightarrow L $$ and $$\overrightarrow r $$ denote the linear momentum, angular momentum and position vector of the particle (from focus O) respectively at a point A, then the direction of $$\overrightarrow \alpha $$ = $$\overrightarrow p $$ $$\times$$ $$\overrightarrow L $$ is along.

A
+ve x axis
B
$$-$$ve x axis
C
+ve y axis
D
$$-$$ve y axis
2
WB JEE 2022
MCQ (Single Correct Answer)
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A body of mass m is thrown with velocity u from the origin of a co-ordinate axes at an angle $$\theta$$ with the horizon. The magnitude of the angular momentum of the particle about the origin at time t when it is at the maximum height of the trajectory is proportional to

A
u
B
u2
C
u3
D
independent of u
3
WB JEE 2022
MCQ (Single Correct Answer)
+1
-0.25
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Three particles, each of mass 'm' grams situated at the vertices of an equilateral $$\Delta$$ABC of side 'a' cm (as shown in the figure). The moment of inertia of the system about a line AX perpendicular to AB and in the plane of ABC in g-cm2 units will be

WB JEE 2022 Physics - Center of Mass Question 5 English

A
2 ma2
B
$${3 \over 2}$$ ma2
C
$${3 \over 4}$$ ma2
D
$${5 \over 4}$$ ma2
4
WB JEE 2021
MCQ (Single Correct Answer)
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A uniform thin rod of length L, mass m is lying on a smooth horizontal table. A horizontal impulse P is suddenly applied perpendicular to the rod at one end. The total energy of the rod after the impulse is
A
$${{{P^2}} \over m}$$
B
$${{7{P^2}} \over {8m}}$$
C
$${{13{P^2}} \over {2m}}$$
D
$${{2{P^2}} \over m}$$
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