Consider a rotating platform such as you used in lab. Imagine that it is initial
ID: 1558044 • Letter: C
Question
Consider a rotating platform such as you used in lab. Imagine that it is initially rotating at some angular velocity. You drop a disk, that is not rotating, onto the top of the rotating platform so that it sticks to the rotating platform and begins rotating along with the rotating platform. The center of the disk coincides with the rotation axis. Assume that the disk has a significant moment of inertia around the rotation axis of the platform, i.e. the z-axis. For this rotational collision, which of the following should you observe for the total rotating system (platform + object)? The angular velocity, after the collision, is the same. The total angular momentum of the system is constant. The angular velocity, after the collision, is larger. The angular velocity, after the collision, is smaller. The total energy of the system is constant. The kinetic energy of the system is constant.Explanation / Answer
In this collision since there is no external torque so angular momentum of the system will be conserved.
therefor following options will be valid
- the total angular momentum of the system is constant.
-the angular velocity after the collision is smaller.
-the kinetic energy of the system is constant .