That Polaris will not always be the pole star is due to
A) the sidereal day being shorter than the solar day.
B) precession shifting the celestial pole.
C) the Moon following the ecliptic, instead of the equator.
D) the Earth's revolution being slightly less than exactly 365.25 days.
E) the Solar winds blowing the Earth farther away from the Sun.
B
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Why is the innermost Galilean moon Io made mostly of rock while the outermost Galilean moon, Callisto made of a mixture of ice and rock?
A) Io formed close to Jupiter where the temperatures were too high for ices to form B) Callisto was captured as it wandered in from the Kuiper Belt C) Io once had ice on its surface which was vaporized away by volcanism D) Callisto experience many impact by icy comets which built up a layer of ice on its surface
An object moving along the x axis is acted upon by a force Fx that varies with position as shown. How much work is done by this force as the object moves from x = 2 m to x = 8 m?
?
?
a.
?10 J
b.
+10 J
c.
+30 J
d.
?30 J
e.
+40 J
Velma passes Mort at a speed of 0.75c. At this speed, the "time dilation factor" is 1.5. In other words, Mort observes a 1-second tick of Velma's clock to take 1.5 seconds
Suppose that they are born at the same time, and that Velma observes herself to live 30 years. According to Mort's observations, how old is he when Velma dies? A) 10 years B) 30 years C) 20 years D) 40 years E) 45 years
A(n) ______________ quantity has only magnitude
Fill in the blank(s) with correct word