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. 3
b. 1
c. 1/3
d. 1/9
e. 9


c

Physics & Space Science

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Intensity of Sound: A certain glass window reduces the intensity level of the sound from 72 dB to 47 dB. By what factor is the acoustic power reduced by this glass window?

A. 3.2 × 10-3 B. 2.2 × 10-2 C. 5.6 × 10-2 D. 1.0 × 10-1 E. 1.5 × 10-1

Physics & Space Science

Time Dilation: A spaceship with a constant speed of 0.800c relative to Earth travels to a star that is 4.30 light-years from Earth. How much time for this trip would elapse on a clock on board the spaceship?

A. 3.23 y B. 4.40 y C. 5.15 y D. 5.38 y

Physics & Space Science

Consider a situation where a constant force of 25 N acts on an object having a mass of 2 kg for 3 seconds.What is the magnitude of the change in the object's momentum?

a. 150 kg m/s b. 50 kg m/s c. 75 kg m/s d. undetermined—not enough information given e. none of the above

Physics & Space Science

How many significant figures are in 0.00054?

A) 2 B) 3 C) 4 D) 5 E) 6

Physics & Space Science