Physics
Thermodynamic
Page 9 of 19
#65 Joule showed that mechanical work can
A) create matter
B) be converted into heat quantitatively
C) not produce heat
D) violate energy conservation
#66 Joule's paddle-wheel experiment measured
A) R
B) J (Joule per calorie)
C) Cp
D) Cv
#67 Mechanical equivalent of heat J connects
A) Q (cal) to W (J)
B) mass to energy
C) entropy to temperature
D) pressure to volume
#68 1 cal of heat is equivalent to about
A) 4.2 J of work
B) 1 J of work
C) 42 J of work
D) 0.24 J of work
#69 If 6000 J of mechanical work is fully converted to heat, the heat in calories is about
A) 1430 cal
B) 6000 cal
C) 250 cal
D) 24,000 cal
#70 Numerical: Stirring 0.5 kg water (c=4200) raises its temperature by 2 K only by work. Required work˜
A) 4.2 kJ
B) 8.4 kJ
C) 2.1 kJ
D) 0.42 kJ
#71 Numerical: 200 cal corresponds approximately to
A) 84 J
B) 838 J
C) 4.2 kJ
D) 0.2 J
Page 9 of 19
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