Annual meteor showers such as the Perseids in August are caused by ________.
A. Earth passing through the debris left behind by a comet as we cross its orbit
B. the breakup of asteroids that hit our atmosphere at predictable times
C. passing asteroids triggering auroral displays
D. nuclear reactions in the upper atmosphere triggered by meteoritic particle storms
Answer: A
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A 6.0-m wire with a mass of 50 g, is under tension. A transverse wave, for which the frequency is 810 Hz, the wavelength is 0.40 m, and the amplitude is 4.0 mm, is propagating on the wire
The time for a crest of this wave to travel the length of the wire is closest to A) 19 ms. B) 16 ms. C) 21 ms. D) 23 ms. E) 25 ms.
The variation in the pressure of helium gas, measured from its equilibrium value, is given by DP = 2.9 × 10^-5 cos (6.20x - 3 000t) where x and t have units m and s, and DP is measured in N/m2 . Determine the frequency (in Hz) of the wave
a. 1 500 b. 477 c. 1.01 d. 0.32 e. 239
We can find the masses and diameters of stars that are in eclipsing binary systems
Indicate whether the statement is true or false
You are observing the wobble of a star caused by the orbit of a planet around that star. Which property of this system listed below most signi?cantly affects the period of that wobble?
A) the planet's orbital radius B) the planet's mass C) both the planet's orbital radius and its mass D) neither the planet's orbital radius nor its mass