T2 = kR3 is known as ______________
Fill in the blank(s) with correct word
Kepler's third law, or harmonic law
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Astronomers think the Milky Way has spiral arms because
A. globular clusters outline spiral arms. B. X-ray maps show that dust clouds are distributed in the disk with a spiral pattern. C. they can see them unwinding along the celestial equator. D. young star clusters, HII regions, and associations outline spiral arms. E. All of these choices are correct.
The thickness of the Galaxy near the Sun is about 1000 light-years
Indicate whether the statement is true or false
Slanting Surfaces With Friction: A block of mass m sits at rest on a rough inclined ramp that makes an angle ? with the horizontal. What must be true about normal force F on the block due to the ramp?
A. F > mg B. F > mg cos ? C. F > mg sin ? D. F = mg cos ? E. F = mg sin ?
A mass is bouncing on the end of a spring with a period T when measured by a ground observer. What would the period of oscillation be (as measured by the same observer) if the mass and spring were moving past the ground observer at a speed of 0.600c?
a. 0.440 T b. 1.25 T c. 0.600 T d. 1.67 T