RMS and Peak Quantities: A 100-W light bulb is powered by 120 V ac 60.0-Hz household connection. Determine the rms current and the current amplitude.
What will be an ideal response?
0.833 A rms, 1.18 A amplitude
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The nebular theory predicts that
A) most stars should have planetary systems B) only solar-type stars should have planetary systems C) planetary systems are relatively rare D) the Sun is unique in having a planetary system
As comets approach and move around the Sun, the coma and the tail ______________ in size
a. decrease b. increase c. remain the same d. none of the above
Two-Source Interference of Sound: Two stereo speakers mounted 4.52 m apart on a wall emit identical sound waves. You are standing at the opposite wall of the room at a point directly between the two speakers. You walk 2.11 m parallel to the wall, to a location where you first notice that the sound intensity is essentially zero. If the wall along which you are walking is 10.7 m from the wall with the speakers, what is the wavelength of the sound waves? The walls are cushioned to absorb sound reflections.
A. 1.71 m B. 2.05 m C. 2.57 m D. 2.91 m
James and John dive from an overhang into the lake below. James simply drops straight down from the edge. John takes a running start and jumps with an initial horizontal velocity of 25 m/s. When they reach the lake below,
A) the splashdown speed of James is larger than that of John. B) the splashdown speed of John is larger than that of James. C) they will both have the same splashdown speed. D) the splashdown speed of James will always be 9.8 m/s larger than that of John. E) the splashdown speed of John will always be 25 m/s larger than that of John.