Energy Conservation With Conservative Forces: In a museum exhibit of a simple pendulum, a very small but dense 6.0-kg ball swings from a very light 2.5-m wire. The ball is released from rest when the pendulum wire makes a 65° angle with the vertical, and it swings in a circular arc with no appreciable friction or air resistance. What is the tension in the wire just as the ball swings through its lowest position?
A. 11 N
B. 59 N
C. 68 N
D. 130 N
E. 0 N
Answer: D
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A. 0.204 B. 0.263 C. 0.301 D. 0.325 E. 0.375
The "rare Earth hypothesis" holds that Earth-like planets will prove to be quite rare. Which of the following statements best sums up the current status of the debate over this hypothesis?
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What is the energy of a photon that has the same wavelength as an electron with energy 
J?
A. 10.0 keV B. 101 keV C. 55.3 keV D. 5.53 keV E. 6.77 keV
An ideal parallel-plate capacitor consists of two parallel plates of area A separated by a distance d. This capacitor is connected to a battery that maintains a constant potential difference across the plates
If the separation between the plates is now doubled, the amount of electrical energy stored on the capacitor will A) double. B) quadruple. C) be cut in half. D) be cut in fourth. E) not change.