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to 
. Calculate:
. The iron piece is then ground for ten minutes with a 200 W grinder. How much does the internal energy of iron increase? The specific heat capacity of iron is 
.
. In doing so, it lengthens by 1.3 mm and pushes away the object lying right next to it with a force of 2000 N. How much has the internal energy of the rod changed? The specific heat capacity of iron is 465 J/kg K.
