試題詳解

45. A cube of metal has an edge length of 10 cm. It has a density 3.0 g/cm³ and a specific heat 0.2cal/g°C. When the internal energy of the cube increases by 9000 cal, its temperature increases by _____.
(A) 9°C
(B) 10°C
(C) 12°C
(D) 15°C
(E) 20°C