PROBLEMS 14.5 Refer to Table 15 of Appendix C. A 2.50-lb piece of steel is dropped into 11.0 lb of water at 75.0°F. The final tem. perature is 84.0°F. What was the initial temperature of the steel? Mary mixes 5.00 lb of water at 200°F with 7.00 lb of water at 65.0°F. Find the final temperature of the mixture. A 250-g piece of tin at 99°C is dropped in 100 g of water at 10°C. If the final temperature of the mixture is 20°C, what is the specific heat of the tin? How many grams of water at 20°C are necessary to change 800 g of water at 90°C to 50°C? 1. 2. 3. 4. A 159-lb piece of aluminum at 500°F is dropped into 400 lb of water at 60 F. 5. in the final temnerature? I71

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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.