A Machine Gear Consists of 0 $\degree$ C? (Specific Heats of Iron and Copper Are 450 and 0.16

Multiple Choice

A machine gear consists of 0.40 kg of iron and 0.16 kg of copper. How much total heat is generated in the part if its temperature increases by 35 $\degree$ C? (Specific heats of iron and copper are 450 and 390 J/kg · $\degree$ C, respectively.)

A) 910 J
B) 8500 J
C) 4000 J
D) 5300 J