Which of the following terms is given to a pair of stars that we can determine are orbiting each other only by measuring their periodic Doppler shifts?
A) visual binary
B) eclipsing binary
C) spectroscopic binary
D) double star
E) none of the above
C) spectroscopic binary
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In the Northern Hemisphere, cyclones rotate ________; whereas an anticyclone rotates ________
A) counterclockwise around a low pressure center; clockwise around a high pressure center B) clockwise around a low pressure center; counterclockwise around a high pressure center C) counterclockwise around a high pressure center; clockwise around a low pressure center
Velocity Addition: Two spaceships are approaching one another, each at a speed of 0.31c relative to a stationary observer on Earth. What speed, in terms of the speed of light, does an observer on one spaceship record for the other approaching spaceship?
Fill in the blank(s) with the appropriate word(s).
Which of the following is not evidence for dark matter?
A) the flat rotation curves of spiral galaxies B) x-ray observations of hot gas in galaxy clusters C) gravitational lensing around galaxy clusters D) the expansion of the universe
What is the radius of curvature of the path of a 3.0-keV proton in a perpendicular magnetic field of magnitude 0.80 T?
a. 9.9 mm b. 1.1 cm c. 1.3 cm d. 1.4 cm e. 7.6 mm