First Law of Thermodynamics: A monatomic ideal gas undergoes an isothermal expansion at 300 K, as the volume increased from 0.010 m3 to 0.040 m3. The final pressure is 130 kPa. What is the change in the internal (thermal) energy of the gas during this process? (R = 8.31 J/mol ? K)
A. 0.0 kJ
B. 3.6 kJ
C. 7.2 kJ
D. -3.6 kJ
E. -7.2 kJ
Answer: A
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General Questions: The figure shows two boxes, with m1 > m2, that are on a level frictionless surface. We can apply a horizontal force 
either toward the right on m1 or toward the left on m2. The magnitude of the force that the boxes exert on each other is
A. zero newtons in either case.
B. larger if 
is applied toward the right.
C. larger if 
is applied toward the left.
D. the same in either case.