A thermos keeps 500 g of black coffee at 85°C . After added 60g of milk at 25°C, the equilibrium temperature stops at 79°C. Assume that there is no heat loss during the mixing of coffee and milk, the specific heat of coffee is 4.2 Jg¬1°C¯1, (a) calculate the specific heat of milk in unit Jg¬1°C=1 (b) calculate the heat capacity of milk. (c) State and Explain 2 possible ways that could cause the heat loss.

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Special Relativity

The theory of special relativity discusses how space and time are related to objects traveling along a straight line at a constant speed. Simply stated, as an object reaches the speed of light, its mass becomes infinite and it is unable to move faster than light. This interstellar speed limit has been the topic of much debate in astronomy, and also in science fiction when people consider how to fly over large distances.