For all irreversible processes involving a system and its environment:
A. the entropy of the system does not change
B. the entropy of the system increases
C. the total entropy of the system and its environment does not change
D. the total entropy of the system and its environment increases
E. none of the above
Ans: D. the total entropy of the system and its environment increases
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The elements hydrogen and helium were made during the first few minutes after the big bang
a. True b. False Indicate whether the statement is true or false
Coulomb's Law: Three point charges are located on the x-axis at the following positions: Q1 = +2.00 ?C is at x = 1.00 m, Q2 = +3.00 ?C is at x = 0.00, and Q3 = -5.00 ?C is at x = -1.00 m. What is the magnitude of the electric force on Q2? (k = 1/4??0 = 8.99 × 109 N ? m2/C2)
A. 0.0540 N B. 0.135 N C. 0.158 N D. 0.0810 N E. 0.189 N
Two very small plastic balls of equal mass are released from rest. One of them carries +10 µC of excess charge and the other one carries +1µC of charge
No other charges or fields are present. Which of the following statements are true about them as they move away from each other? (There may be more than one correct choice.) A) The acceleration of the 10-µC ball is 10 times that of the 1-µC ball. B) The balls always have accelerations of equal magnitude. C) The speed of the balls keeps increasing. D) The acceleration of the balls keeps increasing. E) The acceleration of the 1-µC ball is 10 times that of the 10-µC ball.
Semiconductors: In a good conductor, the highest energy band containing electrons is
A. only partially filled. B. completely filled. C. completely empty.