Two solid blocks, P and Q, are placed in thermal contact. During the first 5 minutes, Block P cools from 80 °C to 60 °C, while Block Q warms from 20 °C to 40 °C. After 10 minutes, both blocks remain steady at 50 °C.
Which statement best explains the direction of energy transfer during the first 5 minutes?
(a) Energy flows from Block Q to Block P because Block Q’s temperature rises more rapidly.
(b) Energy flows from Block P to Block Q because Block P’s particles initially have a higher average kinetic energy.
(c) The direction of energy transfer cannot be determined without knowing the masses or specific heat capacities of the blocks.
(d) Energy flows equally in both directions because the temperature difference changes over time.