Suppose a planet is discovered by the Doppler technique and is then discovered to have transits. In that case, we can determine all the following about the planet except
A) its precise mass.
B) its density.
C) its physical size (radius).
D) its rotation period.
E) its orbital period.
D
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The force that causes Earth to orbit the Sun is due to gravity, while the force needed to keep Earth moving as it circles the Sun is
A) inertia. B) due to gravity. C) due to both inertia and gravity. D) no force at all.
A mass m = 4.0 kg is connected, as shown, by a light cord to a mass M = 6.0 kg, which slides on a smooth horizontal surface. The pulley rotates about a frictionless axle and has a radius R = 0.12 m and a rotatinal inertia I = 0.090 kg?m2. The cord does not slip on the pulley. What is the magnitude of the acceleration of m?
?
?
a.
2.4 m/s2
b.
2.8 m/s2
c.
3.2 m/s2
d.
4.2 m/s2
e.
1.7 m/s2
The lunar maria are
a. the lava plains of the lunar lowlands. b. the smooth plateaus of the lunar highlands. c. less than one billion years old. d. moving plates of lunar crust. e. older than the lunar highlands.
Many Earth-based telescopes are larger than the Hubble Space Telescope, so what justifies the great expense of a "space-based" instrument?
What will be an ideal response?