What is a magnetosphere?
A) the uppermost layer of any planetary atmosphere
B) the layer of a planet in which its magnetic field is generated
C) the region in a planet's atmosphere in which auroras occur
D) a region of space around a planet in which the planet's magnetic field can trap charged particles
D
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What is the total mass of a binary star system with P = 20 yr and a = 10 AU?
a. 2 solar masses b. 2.5 solar masses c. 0.5 solar mass d. 80 solar masses e. 0.4 solar mass
A spaceship, moving toward the Earth at a speed of 0.9c, shines a green laser at Earth. An observer on Earth would see the light arriving at a speed of
A. 1.9c and with a shorter wavelength. B. c but at a shorter wavelength. C. 0.1c and with an inverted frequency. D. c but at a smaller frequency. E. more than c but less than 1.9c.
Radiation pressure: The total electromagnetic power emitted by the sun is 3.8 × 1026 W. What is the radiation pressure it exerts on the perfectly absorbing surface of a satellite near the orbit of Mercury, which is 5.8 × 1010 m from the sun? The radiation strikes the surface of the satellite perpendicular to the surface. (c = 3.0 × 108 m/s)
Fill in the blank(s) with the appropriate word(s).
From film taken in SkyLab and the Space Shuttle, we learned that objects in SkyLab
A. have mass but no weight. B. have mass but no force due to gravity. C. have neither mass nor weight. D. fall to the floor with an acceleration of 9.5 m/s2.