Thin Lenses: An object is placed 60 cm from a convex lens with a focal length of magnitude 10 cm. What is the magnification?
A. -0.10
B. 0.10
C. 0.15
D. 0.20
E. -0.20
Answer: E
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How does the axial tilt of Mars compare with our own?
A) Like Jupiter, Mars always keeps its equator pointing at the Sun. B) It is about half our own, 12 degrees. C) It is almost identical to the Earth. D) Like Saturn, it's about 27 degrees. E) Like Uranus, it is 98 degrees and flopped over on its side.
Light travels at a speed of 300,000 km/s. About how far is a light-year?
A) 10 million meters B) 10 billion km C) 300,000 km D) 10 million km E) 10 trillion km
Consider a set of hypothetical planets that are identical in their orbits and properties except they have different axis tilts. Which of the following axis tilts would give its planet the most extreme differences between their seasons? (Axis tilt is measured relative to a line drawn perpendicular to the planet's orbit.)
A) 23.5 degrees B) 90 degrees C) 0 degrees D) 45 degrees
Astronomers use ________ to determine the magnetic field of white dwarfs.
A. the Zeeman splitting of spectral lines B. the doppler effect C. conservation of angular momentum D. Wien's law