Coursework help? Moment of inertia/radius of gyration/velocity question

In summary, the problem involves an engine with a moment of inertia equivalent to a mass of 40Kg and a radius of gyration of 112mm being coupled to a rotating drum with a mass of 12Kg and a radius of gyration of 129mm. The initial velocity of the engine is 11 rev/s and the drum is at rest. Using conservation of angular momentum, the velocity of the engine and drum can be found immediately after connection.
  • #1
bobmarly12345
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Coursework help!? Moment of inertia/radius of gyration/velocity question

Homework Statement




An engine is suddenly coupled to a rotating drum by a friction clutch. The moment of inertia of the engine is equivalent to a mass of 40Kg acting with a radius gyration of 112mm. The drum has a mass of 12Kg and a radius of gyration of 129mm. The initial velocity of the engine before engagement is 11 rev/s and the drum is initially at rest. Find the velocity of engine and drum immediately after connection.



Have no idea where to start, any help would be great thanks?
 
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welcome to pf!

hi bobmarly12345! welcome to pf! :smile:
bobmarly12345 said:
An engine is suddenly coupled to a rotating drum by a friction clutch. The moment of inertia of the engine is equivalent to a mass of 40Kg acting with a radius gyration of 112mm. The drum has a mass of 12Kg and a radius of gyration of 129mm. The initial velocity of the engine before engagement is 11 rev/s and the drum is initially at rest. Find the velocity of engine and drum immediately after connection.

this is a collision, so energy isn't conserved, but angular momentum is conserved

so use conservation of angular momentum …

what do you get? :smile:​
 

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