If you want to store 2.0 mJ of energy in a 10-?F capacitor, how much potential do you need to put across it?
A) 5.0 V
B) 10 V
C) 15 V
D) 20 V
D
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Sonic Booms: As a supersonic airplane increases its speed more and more, the half-angle of the conical shock wave
A. increases. B. decreases. C. is not affected.
Carnot Engine: If the efficiency of a Carnot engine were to be 100%, the heat sink would have to be
A. at absolute zero. B. at 0°C. C. at 100°C. D. infinitely hot.
Parallel Wires: Two long parallel wires are placed side-by-side on a horizontal table. If the wires carry current in opposite directions,
A. one wire is lifted slightly while the other wire is forced downward against the table's surface. B. both wires are lifted slightly. C. the wires pull toward each other. D. the wires push away from each other.
Material 1 has Young's modulus Y1 and density ?1, material 2 has Young's modulus Y2 and density ?2, and material 3 has Young's modulus Y3 and density ?3 . If Y1 > Y2 > Y3 and if ?1 < ?2 < ?3, which material has the highest speed of sound?
a. material 1 b. material 2 c. material 3 d. They could all have equal speeds of sound.