A bob of mass $0.1\; kg$ hung from the celling of a room by a string $2 \;m$ long is set into oscillation. The speed of the bob at its mean position is $1\; m s ^{-1}$. What is the trajectory of the bob if the string is cut when the bob is
$(a) $ at one of its extreme positions,
$(b)$ at its mean position.
$(a)$ Vertically downward with Parabolic path
At the extreme position, the velocity of the bob becomes zero. If the string is cut at this moment, then the bob will fall vertically on the ground.
$(b)$ At the mean position, the velocity of the bob is $1\; m/s$. The direction of this velocity is tangential to the arc formed by the oscillating bob. If the bob is cut at the mean position, then it will trace a projectile path having the horizontal component of velocity only. Hence, it will follow a parabolic path.
A mass of $1 \;kg$ is thrown up with a velocity of $100 \;m / s$. After $5 \;seconds$, it explodes into two parts. One part of mass $400\; g$ comes down with a velocity $25 \;m / s$ Calculate the velocity of other part
A cannon ball is fired with a velocity $200\, m/sec$ at an angle of $60^o$ with the horizontal. At the highest point of its flight it explodes into $3$ equal fragments, one going vertically upwards with a velocity $100\, m/sec$, the second one falling vertically downwards with a velocity $100\, m/sec$. The third fragment will be moving with a velocity
If final momentum is equal to initial momentum of the system then
An initially stationary device lying on a frictionless floor explodes into two pieces and slides across the floor one piece is moving in positive $x$ direction then other peice is moving in
A nucleus is at rest in the laboratory frame of reference. Show that if it disintegrates into two smaller nuclei the products must move in opposite directions.