1. A power station with an efficiency of 0.3 generates 10 8 W of electric power

Question

1. A power station with an efficiency of 0.3 generates 108 W of electric power and dissipates 2.33 108 W of thermal energy to the cooling water that flows through it. Knowing the specific heat of water in SI units is 4184 J/kg°C, calculate how many kilograms of water flow through the plant each second if the water is heated through 3 degrees Celsius.
kg

2. The temperature of the sun's interior is about 107 degrees. Does it matter whether this is degrees Celsius or kelvins?

yes or no    

3. Helium has the special property that its internal energy is directly proportional to its absolute temperature. Consider a flask of helium with a temperature of 20°C. If it is heated until it has nine times the internal energy, what will its temperature be?
°C

4. If you vigorously shake a can of liquid back and forth for more than a minute, will the temperature of the liquid increase? (Try it and see.)

temperature remains ,constant temperature increases   or temperature decreases

5. What is the ultimate source of the energy in coal, oil, and wood?

geo thermal energy, solar energy     ,thermal energy

Explanation / Answer

(1) electric power dissipiated as heat=2.33x108 W

specific heat of water=c= 4184 J/kg°C

deltaT=3oC

now heat= m c deltaT

2.33x108 = m (4184)(3)

m=2.33x108 /(4184*3)

m=18562.7kg/s

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