First Law of Thermodynamics: An athlete doing push-ups performs 650 kJ of work and loses 425 kJ of heat. What is the change in the internal (thermal) energy of the athlete?
A. -225 kJ
B. -1075 kJ
C. 1075 kJ
D. 225 kJ
E. 276 kJ
Answer: B
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Answer the following statement true (T) or false (F)
A 3.0-kg object moving 8.0 m/s in the positive x direction has a one-dimensional elastic collision with an object (mass = M) initially at rest. After the collision the object of unknown mass has a velocity of 6.0 m/s in the positive x direction. What is M?
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