A + 5.0-?C charge is moved from a negative to a positive plate of a parallel plate capacitor. In moving this charge 0.30 mJ of energy is used. What is the potential difference between the plates of this capacitor?
A) 60 V
B) 81 V
C) 55 V
D) 23 V
E) 0 V
A
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A uranium atom is 238 times as massive as a hydrogen atom. Compared with the diameter of a hydrogen atom, uranium's size is
A) slightly smaller. B) only slightly larger. C) is much larger, but less than 238 times as large.
Part of astrophysics is understanding the history of celestial objects
a. True b. False Indicate whether the statement is true or false
Two capacitors with capacitances of 1.0 mC and 0.50 mF, respectively, are connected in series. The system is connected to a 150 V battery. What charge accumulates on the 1.0-mF capacitor?
a. 50 mC c. 100 mC b. 150 mC d. 33 mC
Equilibrium: Two blocks, A and B, are being pulled to the right along a horizontal surface by a horizontal 100-N pull, as shown in the figure. Both of them are moving together at a constant velocity of 2.0 m/s to the right, and both weigh the same. 
Which of the figures below shows a correct free-body diagram of the horizontal forces acting on the upper block, A?
A. 
B. 
C. 
D. 
E. 