If the disk is free to move, then pouring sand on it slows it down. Angular momentum is conserved
AngMomDisk+angmomeumfallingSand=angular momentum disk/sand
Since final angular momentum is constant, and consists of the mass of sand on the disk, and the angular velocity, increasing the mass has to decrease anglar velocity.
Whn sand is poured on a rotatory disc what happens to its angular velocity. Explain
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