A planet is detected via the Doppler technique. The repeating pattern of the stellar motion tells us
A) the planet's size.
B) the planet's mass.
C) the planet's density.
D) the orbital period of the planet.
E) the orbital eccentricity of the planet.
D
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A guitar string has a tension of 95 N on it and is 75 cm long. If its mass is 0.27 g, what is the frequency of the first harmonic above the fundamental?
A. 685 Hz B. 69 Hz C. 217 Hz D. 470 kHz
The resistive force of friction occurs for
A) solids. B) liquids. C) gases. D) all of the above
Which of these is NOT an argument for Cygnus X-1 being a black hole?
A) The mass of the X-ray source is about 10 solar masses. B) It is the third strongest source of X-rays in the sky. C) The X-rays from the compact source vary in as little as a millisecond. D) Spectroscopic data suggests hot gas is flowing toward the X-ray source. E) The mass of the visible star is greater than that of the X-ray source.
Quarks are held together by the color force.Electrons are made of quarks
Indicate whether the statement is true or false