. So the volume of the steel rod is V, then the total energy in the steel rod is given by 
. If the mass of the steel rod is m then we can rewrite it as
.
Thursday, April 23, 2009
Irodov Problem 1.309
The volume density of energy due to elastic deformation is given by 
. So the volume of the steel rod is V, then the total energy in the steel rod is given by 
. If the mass of the steel rod is m then we can rewrite it as
.
. So the volume of the steel rod is V, then the total energy in the steel rod is given by . If the mass of the steel rod is m then we can rewrite it as.
Irodov Problem 1.308
Consider an infinitesimally thin ring section of radius r and thickness dr. The mass
of this thin ring section is given by where p is the density of the ring. Each point in this thin ring section experiences a tangential linear acceleration of 
. When viewed from the reference frame fixed to the ring, this translates to a pseudo force 
. This pseudo force translates to a pseudo torque 
. The net torque is then given by,
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