A fan of moment of inertia $0.6\,kg \times m^2$ is turned upto a working speed of $0.5$ revolutions per second. The angular momentum of the fan is
$0.6\pi \,kg \times m^2/sec$
$6\,kg \times m^2/sec$
$3\,kg \times m^2/sec$
$\frac{\pi }{6}\,kg \times \,{m^2}/\sec $
The direction of the angular velocity vector along
Two rigid bodies $A$ and $B$ rotate with rotational kinetic energies $E_A$ and $E_B$ respectively. The moments of inertia of $A$ and $B$ about the axis of rotation are $I_A$ and $I_B$ respectively. If $I_A = I_B/4 \,$and$ \, E_A = 100\ E_B$ the ratio of angular momentum $(L_A)$ of $A$ to the angular momentum $(L_B)$ of $B$ is
A particle is moving along a straight line with increasing speed. Its angular momentum about a fixed point on this line
A particle is moving along a straight line with increasing speed. Its angular momentum about a fixed point on this line ............
A ball of mass $1 \,kg$ is projected with a velocity of $20 \sqrt{2}\,m / s$ from the origin of an $x y$ co-ordinate axis system at an angle $45^{\circ}$ with $x$-axis (horizontal). The angular momentum [In $SI$ units] of the ball about the point of projection after $2 \,s$ of projection is [take $g=10 \,m / s ^2$ ] ( $y$-axis is taken as vertical)