A block of mass $m$ is released on a smooth inclined plarie of inclination $\theta$ with the horizontal. The force exerted by the plane on the block has a magnitude
$m g$
$\frac{m g}{\cos \theta}$
$m g \tan \theta$
$m g \cos \theta$
A ping-pong ball of mass $m$ is floating in air by a jet of water emerging out of a nozzle. If the water strikes the ping-pong ball with a speed $v$ and just after collision water falls dead, the mass flow rate of water in the nozzle is equal to
A constant force $F$ is applied in horizontal direction as shown. Contact force between $M$ and $m$ is $N$ and between $m$ and $M ^{\prime}$ is $N ^{\prime}$ then
In the above question the speed of the mass when travelled half the maximum distance is
What should be the minimum force $P$ to be applied to the string so that block of mass $m$ just begins to move up the frictionless plane.