Why do you hear thunder a substantial time after seeing a lightning flash?
a. The sound is produced later than the light is.
b. Your eyes respond more quickly than your ears.
c. The flash and thunder really are simultaneous, but the thunder lasts longer than the flash.
d. Sound travels much more slowly than light.
D
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A string, 0.28 m long and vibrating in its third harmonic, excites an open pipe that is 0.82 m long into its second overtone resonance. The speed of sound in air is 345 m/s. The speed of transverse waves on the string is closest to
A) 120 m/s. B) 110 m/s. C) 100 m/s. D) 98 m/s. E) 91 m/s.
Which one of the following quantities is equivalent to 1 ??
A) 1 V ? A B) 1 J/s C) 1 W/A D) 1 A ? s E) 1 V/A
Based on the H-R diagram shown above, what is the spectral type of a main-sequence star with a luminosity 100 times greater than that of the Sun?
A) O B) A C) G D) M
Potential of Point-Charges: A sphere with radius 2.0 mm carries a +2.0 ?C charge. What is the potential difference, VB - VA, between point B, which is 4.0 m from the center of the sphere, and point A, which is 6.0 m from the center of the sphere? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A. 1500 V B. -1500 V C. 170 V D. -0.63 V