A 02-Kg Aluminum Plate,initially at 20°C,slides Down a 10-M Long Surface,inclined

A 0.2-kg aluminum plate,initially at 20°C,slides down a 10-m long surface,inclined at a 30° angle to the horizontal.The force of kinetic friction exactly balances the component of gravity down the plane so that the plate,once started,glides down at constant velocity.If 90% of the mechanical energy of the system is absorbed by the aluminum,what is its temperature increase at the bottom of the incline? (Specific heat for aluminum is 900 J/kg · °C. )

A) 0.16°C
B) 0.07°C
C) 0.05°C
D) 0.03°C

Correct Answer:

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