1
WB JEE 2022
+1
-0.25  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
+1
-0.25 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
+1
-0.25 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 A
2 ma2
B
$${3 \over 2}$$ ma2
C
$${3 \over 4}$$ ma2
D
$${5 \over 4}$$ ma2
4
WB JEE 2021
+1
-0.25 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
$${{2{P^2}} \over m}$$
WB JEE Subjects
Physics
Mechanics
Electricity
Optics
Modern Physics
Chemistry
Physical Chemistry
Inorganic Chemistry
Organic Chemistry
Mathematics
Algebra
Trigonometry
Coordinate Geometry
Calculus
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