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Chapter 14: Q20Q (page 390)
A 22掳C day is warm, while a swimming pool at 22掳C feels cool. Why?
The rate of heat flow is more when you are in the pool. So, it feels cooler inside the pool than the land at the same temperature.
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(II) An iron boiler of mass 180 kg contains 730 kg of water at 18掳C. A heater supplies energy at the rate of 58,000 kJ/h. How long does it take for the water (a) to reach the boiling point and (b) to all have changed to steam?
Why is wet sand at a beach cooler to walk on than dry sand?
(II)Estimate the Calorie content of 65 g of candy from the following measurements. A 15-g sample of the candy is placed in a small aluminum container of mass 0.325 kg filled with oxygen. This container is placed in 1.75 kg of water in an aluminum calorimeter cup of mass 0.624 kg at an initial temperature of 15.0掳C. The oxygen鈥揷andy mixture in the small container (a 鈥渂omb calorimeter鈥�) is ignited, and the final temperature of the whole system is 53.5掳C
(II) At a crime scene, the forensic investigator notes that the 6.2-g lead bullet that was stopped in a doorframe apparently melted completely on impact. Assuming the bullet was shot at room temperature (20掳C), what does the investigator calculate as the minimum muzzle velocity of the gun?
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