Questions
A number of forces are acting on a system. If net external force on the system is zero, Then
detailed solution
Correct option is D
If net external force is zero, then linear momentum of the system must be conserved.If external forces are not concurrent then , net external torque will not be zero and in that case angular momentum of the system will not be conserved If external forces are concurrent then net external torque must be zero and in this case angular momentum remain conserved.Talk to our academic expert!
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A disc rotates freely with rotational kinetic energy E about a normal axis through centre. A ring having the same radius but double the mass of disc is now, gently placed on the disc. The new rotational kinetic energy of the system would be
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