Comets that we can see originate in the ________ and ________
Fill in the blank(s) with correct word
Kuiper Belt and Oort Cloud
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The Doppler shift is used to find
A) astrometric binaries. B) spectroscopic binaries. C) photometric binaries. D) visual binaries. E) eclipsing binaries.
A boy on a skate board skates off a horizontal bench at a velocity of 10 m/s. One tenth of a second after he leaves the bench, to two significant figures, the magnitudes of his velocity and acceleration are:
a. 10 m/s; 9.8 m/s2. b. 9.0 m/s; 9.8 m/s2. c. 9.0 m/s; 9.0 m/s2. d. 1.0 m/s; 9.0 m/s2. e. 1.0 m/s; 9.8 m/s2.
As Earth rotates, circumpolar stars appear to move counterclockwise around the north celestial pole
Indicate whether the statement is true or false
Suppose that in a parallel universe, the proton and electron were identical to their counterparts in our own universe EXCEPT that the electron had twice as much charge as our electron. In our present universe,
the radius of the first Bohr orbit for hydrogen is a0 and the speed of an electron in that orbit is v0. In the parallel universe (a) what would be the radius (in terms of a0 ) of the first Bohr orbit for hydrogen? (b) what would be the speed (in terms of v0 ) of an electron in the first Bohr orbit for hydrogen?