Applying+Math-

**__Applying Math__**
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Section 1
72kg ( 5C ) 1,010 J/(kg C) Q = 363,600 J
 * 1) **The air in a living room has a mass of 72kg and a specific heat of 1,010 J/(kg Degree C). What is the change in thermal energy of the air when it warms from 20 degree C to 25 degree C.**
 * Q = 72kg ( 25 - 20C ) 1,010 J/(kg C)

Section 2
6. **Averaged over a year in cernteral united states, radiation from the sun transfers about 200 W to each square meter of Earth's surface. If a house is 10 m long and 10m wide, how much solar energy falls on the house each second**.


 * 200X10X10=20000 W

Section 3

 * 6. You push down on the handle of a bycicle pump with a force of 20 N. The handle moves 0.3m, and the pump does not absorb or release any heat. What is the change in thermal energy of the bycicle pump?**

7. **The thermal energy released when a gallon of gasoline is burned in a car's engine is 140 million J. If the engine is 25 percent efficient, how much work does it do when one gallon of gasoline is burned?**
 * 20 N X
 * 140,000,000J / 4 = 35,000,000