A spacecraft in space keeps going at the same velocity, even without firing its rockets, in accordance with the _______________ law of motion
a. fourth
b. first
c. second
d. third
b
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Which of the following stars will end its life in a supernova?
A) a 10 solar-mass star B) the Sun C) a 1 solar-mass red giant star D) a neutron star
The Solar and Heliospheric Observatory (SOHO) is positioned:
A) in a geosynchronous orbit around the Earth. B) in near-Earth orbit. C) about 1.5 million kilometers from Earth at the L1 Lagrangian Point. D) on the far side of the Sun at the L3 Langrangian Point. E) on the far side of the Moon.
A 500-eV electron and a 300-eV electron trapped in a uniform magnetic field move in circular paths in a plane perpendicular to the magnetic field. What is the ratio of the radii of their orbits?
A. 2.8 B. 1.7 C. 1.3 D. 4.0 E. 1.0
If the Moon is setting at noon, then it rose at
A) midnight. B) 9 A.M. C) 6 P.M. D) 6 A.M. E) noon.