Re: CONSERVATION OF ENERGY

[al clark <al@sci.nccu.edu>]

On Tue, 15 Jul 1997, brian whatcott wrote:

> Assume both pieces stabilize at same temp., and radiative heat loss is
> sensibly constant.
>
> > 3) How much heat is generated? How much work is done? Explain what happens
> >   to the initial kinetic energy of the iron cube.
>
> Heat - 50 joules
> Work 0 joules
> The initial KE is modeled as all converted to heat.
>
> > *********************************************************************

I disagree.
No heat is generated; heating is a process. The internal energy increases 
by 50 J.
Work done on block = -50 J.
No work done on plate in this idealization.
KE is converted into internal energy.

However, I hope the writers would be more careful in stating the problem.

Al Clark