Two-Source Interference of Sound: Two in-phase loudspeakers are placed along a wall and are separated by a distance of 4.00 m. They emit sound with a frequency of 514 Hz. A person is standing away from the wall, in front of one of the loudspeakers. What is the closest distance from the wall the person can stand and hear destructive interference? The speed of sound in air is 343 m/s.
A. 0.34 m
B. 0.37 m
C. 0.73 m
D. 1.2 m
E. 1.6 m
Answer: A
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Which of the following correctly describes the concept of galactic recycling?
A) New stars are continuously being formed in the Milky Way out of gas that has been ejected from a previous generation of stars. B) In the formation of a star, no matter is wasted as all excess material ends up recycled into planets. C) Stars near the center of the Milky Way are continually recycled to the outskirts of the disk by their orbital motion. D) Life is continuously being spread from star to star in the Milky Way. E) New galaxies are continuously being formed out of gas ejected from a previous generation of galaxies.
A proton (m = 1.7 × 10?27 kg, q = +1.6 × 10?19 C) starts from rest at point A and has a speed of 40 km/s at point B. Only electric forces act on it during this motion. Determine the electric potential difference VB?VA.
A. +8.5 V B. ?8.5 V C. ?4.8 V D. +4.8 V E. ?17 V
Astronomers who discovered quasars found that they show ___________ of their spectral lines and are thus probably much ___________ than nearby galaxies
a. large redshifts; farther away b. large blueshifts; farther away c. no wavelength difference; nearer d. large redshifts; nearer e. large blueshift; nearer
Estimate the torque needed to rotate the inner cylinder at 1000 rpm if SAE-30 oil at 40°C fills the gap. Assume a linear velocity distribution in the gap. Neglect end effects.
(A) 16.0 N·m
(B) 16.9 N·m
(C) 18.8 N·m
(D) 20.2 N·m