6. The percentage from heat that is transformed into work (W/Qx100) is: A) 1% B)

Question

6. The percentage from heat that is transformed into work (W/Qx100) is: A) 1% B) 4 % C) 40 % D) 96 % E) 100% 7. If the heat required to raise the temperature of an object from 5 Degree C to 10 Degree C is ft the heat required to increase the temperature from 10 Degree C to 15 Degree C is: A) Q/3 B) Q/2 C)Q D) 3Q/2 E) 2Q 8. How much water at 10 Degree C (cw=4.2 kJ/kg Degree C) is needed to melt 100g ice at 0 Degree C. (L = 334 Id/kg) A) 0.79 Kg B) 3.34 Kg C) 2.8 Kg D) 7,95 Kg. E) 1.12 Kg 9. Heat transfer is A) impossible from high temperature to low temperature B) spontaneously from high heat to low heat C) spontaneously from high temperature to low temperature D) impossible in an isothermal process

Explanation / Answer

6) data insuficient

7 ) as heat tranfer is proportional to change in temperature so it will be same as Q

8 ) mc(change in tem ) = m(ice) * L

m(water) = -795kg

9) C

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