A pair of parallel plates, forming a capacitor, are connected to a battery. While the capacitor is still connected to the battery maintaining a constant voltage, the plates are pulled apart to triple their original distance. What is the ratio of the final energy stored to the original energy stored?
a. 1/9
c. 3
b. 1/3
d. 1
B
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Power: If the voltage across a circuit of constant resistance is doubled, the power dissipated by that circuit will
A. be four times as large. B. be two times as large. C. decrease to one-half the original power. D. decrease to one-fourth the original power.
A 20-ton truck collides with a 1500-lb car and causes a lot of damage to the car. Since a lot of damage is done on the car
A) the force on the truck is greater then the force on the car. B) the force on the truck is equal to the force on the car. C) the force on the truck is smaller than the force on the car. D) the truck did not slow down during the collision. E) the car did not slow down during the collision.
An eroded surface of metamorphic rocks on which a horizontal bed rests is called a
A) strata. B) dike. C) nonuniform surface. D) nonconformity.
Why was Herschel's strategy for mapping our Galaxy flawed?
A) His infrared telescopes couldn't penetrate the dust clouds. B) He used globular clusters, lying above the dust in the disc. C) He relied on visual wavelengths, which are obscured by dust. D) He used radio telescopes that didn't give enough resolution. E) He assumed Earth was at the extreme edge of the Galaxy.