A metal block of mass 0.35 kg has an initial temperature of 85 ∘C85\text{ }^\circ\text{C}85 ∘C. It is dropped into cold water. The temperature of the block after 2.0 minutes2.0\text{ minutes}2.0 minutes is 25 ∘C25\text{ }^\circ\text{C}25 ∘C.
The specific heat capacity of the metal is 390 J kg-1 K-1.
What is the average thermal power transferred away from the metal block?
28 W28\text{ W}28 W
68 W68\text{ W}68 W
97 W97\text{ W}97 W
4100 W4100\text{ W}4100 W
56 exam-style questions on OCR A A Level Physics Thermal physics, covering Temperature, Solid, liquid and gas, Thermal properties of materials, and Ideal gases. Each one has a worked solution and a mark scheme showing where the marks go.