A hypothetical planet has a mass of one-half that of the earth and a radius of twice that of the earth. What is the free-fall acceleration on the planet in terms of g, the free-fall acceleration at the surface of the earth?
A) g
B) g/2
C) g/4
D) g/8
E) g/16
D
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Which photo shows what we call a first-quarter moon? (Note: Assume these photos were taken in the Northern Hemisphere.)
A) 1 B) 2 C) 3 D) 4
When Mercury or Venus passes in front of the disk of the Sun, we call this
A) an eclipse B) a shadow event C) a transit D) an occultation
As the radius of the orbit of an artificial satellite increases, its orbital period __________
Fill in the blank(s) with correct word
A conducting bar of length L rotates in a counterclockwise direction with a constant angular speed of +2.0 rad/s about a pivot P at one end, as shown. A uniform magnetic field (magnitude = 0.20 T) is directed into the paper. If L = 0.40 m, what is the potential difference, VA ? VB?
a.
+24 mV
b.
?24 mV
c.
+16 mV
d.
?16 mV
e.
+32 mV