A ball rolls along a horizontal track in a certain time. If the track has a small upward dent in it, the time to roll the length of the track will be
A) less.
B) the same.
C) more.
Answer: C
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Red dwarf stars ____
a. never develop a hydrogen-fusion shell b. create large amounts of carbon and oxygen c. have much shorter lifetimes than Sun-like stars d. never begin hydrogen fusion e. become brown dwarfs after they exhaust their hydrogen core
An epicycle was used in geocentric models to explain ________.
A. Earth's circular shadow B. parallax C. retrograde motion D. eclipses E. aurora
In 2014, when scientists used a laser to simulate the conditions generated when a large impact hits a mixture of prebiotic molecules, they were able to produce
A) all 20 amino acids used in life B) all four DNA bases used in life C) complex carbohydrates D) simple proteins
A light beam from a 2.1-mW He-Ne laser has a wavelength of 633 nm. How many photons does the laser emit in one second?
(h = 6.626 × 10-34 J ? s, c = 3.00 × 108 m/s) A) 1.3 × 1016 B) 6.7 × 1015 C) 8.8 × 1015 D) 1.1 × 1016