Standing Sound Waves: One of the harmonics of a column of air in a tube that is open at one end and closed at the other has a frequency of 448 Hz, and the next higher harmonic has a frequency of 576 Hz. How long is the tube? The speed of sound in air is 343 m/s.
A. 1.34 m
B. 0.670 m
C. 0.335 m
D. 1.00 m
E. 2.68 m
Answer: A
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Velocity: Which of the following quantities has units of a velocity? (There could be more than one correct choice.)
A. 40 km southwest B. -120 m/s C. 9.8 m/s2 downward D. 186,000 mi E. 9.8 m/s downward
Copernicus' Heliocentric theory explains that
A) the Sun lies at one focus of an ellipse. B) all planets lie between the Sun and Earth. C) Mars will retrograde when it reaches a certain position on its epicycle. D) Venus retrogrades when she overtakes us at inferior conjunction. E) planetary orbits are elliptical in shape.
A physicist claims that she has found a new particle with a mass 200 000 times the mass of the proton (1.67 × 10?27 kg) and a charge of 3.20 × 10?19 C. If she is correct, such a particle traveling in a circle in a uniform 5.00 T magnetic field at a velocity of 2 500 m/s will have a radius of
A. 0.261 m. B. 0.522 m. C. 1.04 m. D. 3.27 m. E. 3.13 × 1026 m.
If the electric field and magnetic field of an EM wave are given by E = Eo sin(kx - ?t) and B = Bo sin(kx - ?t), and if the value of Eo is 5.1 x 10-5 V/m, what is the value of Bo?
A) 1.7 × 1014 T B) 1.7 × 103 T C) 1.7 × 10-14 T D) 1.7 × 104 T E) 1.7 × 10-13 T