Pluto's bulk density is
A) 3,400 kg/m3, comparable to our Moon's.
B) 2,100 kg/m3, similar to Callisto's mix of rock and ice.
C) 1,200 kg/m3, like Mimas, made of almost pure ice.
D) 700 kg/m3, like Saturn a mix of hydrogen and helium slush.
E) 400 kg/m3, like Comet Halley's nucleus, a ice ball with many gas pockets.
B
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During the month of June the north celestial pole points towards Polaris but during the month of December it points
a. just north of Polaris. b. just south of Polaris. c. towards the star Vega. d. towards the star Thuban. e. still towards Polaris.
All the following statements are true. Which one follows directly from Kepler's third law (p2 = a3)?
A) Venus orbits the Sun at a slower average speed than Mercury. B) Venus is more massive than Mercury. C) Venus takes longer to rotate than it does to orbit the Sun. D) Venus has a thicker atmosphere than Mercury.
Which of the following experiments demonstrate the particle properties of light?
A. diffraction B. interference C. photoelectric effect D. refraction
A 1.5-kg object moving along the x axis has a velocity of +4.0 m/s at x = 0. If the only force acting on this object is shown in the figure, what is the kinetic energy of the object at x = +3.0 m?
a.
18 J
b.
21 J
c.
23 J
d.
26 J
e.
8 J