Consider an asteroid in an elliptical orbit whose closest point to the sun is rc = 1 AU and farthest point is 7 AU from the sun. Its orbital period is
A. 1 yr
B. (3.5)2/3 y = 2.31 y
C. 4 yr
D. 83/2 y = 22.6 y
E. Some other period (specify)
E. Some other period (specify)
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Answer the following statement(s) true (T) or false (F)
1. A particle’s mass is the same in all inertial reference frames (even though its speed is not) 2. The components of a particle’s four-momentum are the same in all inertial reference frames. 3. As a particle’s speed approaches that of light, the difference between its relativistic momentum magnitude and its relativistic energy E becomes small (compared to E).
Which of these is true of planetary nebulae?
A) They are the material which causes the eclipses in eclipsing binary systems. B) They are rings of material around protostars that will accrete into planets in time. C) They are the envelopes that form when blue stragglers merge. D) They are expelled by the most massive stars in their final stages before supernova. E) They are ejected envelopes surrounding a highly evolved low-mass star.
Light from distant stars that must pass through dust arrives bluer than when it left its star
Indicate whether the statement is true or false
Of the following photons, which has the lowest energy?
a. visible b. ultraviolet c. infrared d. microwave