What frequency of sound traveling in air at 40 oC has a wavelength of 0.50 m?
a. 20 Hz b. 344.7 Hz
c. 502.9 Hz d. 711.2 Hz
d
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A glowing blackbody that appears bluish in color is __________ than one that appears reddish
Fill in the blank(s) with correct word
A 120-V rms voltage at 60.0 Hz is applied across an inductor, a capacitor, and a resistor in series. If the rms value of the current in this circuit is 0.600 A, what is the impedance of this circuit?
A) 200 ? B) 141 ? C) 20 4 ? D) 120 ? E) 100 ?
Velma, who is moving past you at a high rate of speed, holds a meter stick and a standard kilogram
Is it possible that your measurements could show the standard kilogram to have a mass of 2 kg while the meter stick still has its normal length of 1 m? A) Yes, if Velma holds the meter stick parallel to its direction of motion. B) Yes, if Velma holds the meter stick perpendicular to its direction of motion. C) No, because mass actually decreases with velocity, rather than increasing. D) No; if the kilogram's mass has increased to 2 kg, then it must be longer than 1 m. E) No; if the kilogram's mass has increased to 2 kg, then it must be shorter than 1 m.
A gravitational "sling-shot":
A) causes comets to crash into planets, such as Jupiter in 1994. B) allowed the Apollo astronauts to reach the Moon in 1969. C) is the accepted theory for the formation of the asteroid belt. D) changes the speed and direction of a spacecraft nearing a massive planet. E) explains how the solar system was formed after a near collision with another star.