An organ pipe open at both ends has a radius of 4.0 cm and a length of 6.0 m. What is the frequency (in Hz) of the third harmonic? (Assume the velocity of sound is 344 m/s.)
a. 76
b. 86
c. 54
d. 28
e. 129
b
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A cyclist does work at the rate of 500. W while riding. With how much average horizontal force does the wheel push when she is traveling at 10. m/s?
What will be an ideal response?
When two sound waves are out of phase by ____, destructive interference will occur
a. 20° b. 120° c. 900° d. 720° e. 950°
Which of the following hypothetical observations would contradict current understanding of the nature of white dwarfs?
A) discovery of a white dwarf with a mass of 1.5 MSun B) discovery of a white dwarf with a surface temperature of 6000 K C) discovery of a white dwarf at the center of a planetary nebula D) discovery of a white dwarf with a 1.5 MSun mass main-sequence companion
A ray of light is incident on the mid-point of a glass prism surface at an angle of 25.0° with the normal. For the glass, n = 1.55, and the prism apex angle is 40.0°. What is the angle of refraction as the ray enters the air on the far side of the prism? The surfaces involved are those of the apex angle
a. 39.4° c. 22.3° b. 46.0° d. 14.1°