Two particles, each of charge 2.5 × 10^–19 C, are 4.8 × 10^–5 m apart. What is the change in potential energy if they are brought 2.4 × 10^–5 m closer together? (ke = 8.99 × 10^9 N·m2/C2)
a. 1.2E–23 J
b. 4.7E–24 J
c. 2.3E–16 J
d. 1.4E–15 J
e. 2.9E–20 J
a
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How many electrons does it take to make one coulomb of negative charge?
a. 
b. 
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e. 
A dome-shaped house is more heat efficient than a rectangular house because a dome has
A) no corners to radiate. B) less interior space. C) less area compared to its volume. D) all of the above E) none of the above
A rocket explodes into two fragments, one 25 times heavier than the other. The magnitude of the momentum change of the lighter fragment is
A) 25 times as great as the momentum change of the heavier fragment. B) The same as the momentum change of the heavier fragment. C) 1/25 as great as the momentum change of the heavier fragment. D) 5 times as great as the momentum change of the heavier fragment. E) 1/4 as great as the momentum change of the heavier fragment.
Suppose the velocity of waves on a particular rope under a tension of 100 N is 12 m/s. If the tension is decreased to 25 N what will be the new velocity of waves on the rope?
A. 18 m/s. B. 12 m/s. C. 6 m/s. D. 24 m/s. E. 48 m/s.