If you could count stars at a rate of about one per second, how long would it take to count all the stars in the Milky Way Galaxy?
A) several days
B) several weeks
C) several years
D) several thousand years
D) several thousand years
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Nucleosynthesis
a. is the process by which energy is produced at the center of the galaxy. b. is the process by which hydrogen and helium are converted into heavier elements. c. describes the structure of a globular cluster. d. describes how the magnetic field of the galaxy traps cosmic rays. e. describes the method by which neutral hydrogen produces 21-cm radiation.
A 10,000-kg rocket blasts off from earth with a uniform upward acceleration of 2.00 m/s2 and feels no air resistance. The upward thrust force its engines must provide during this acceleration is closest to
A) 20,000 N. B) 980,000 N. C) 118,000 N. D) 78,000 N.
Special relativity predicts that the length of a moving object will be elongated in the direction of motion
a. True b. False Indicate whether the statement is true or false
What is the power of the lens that has a focal length of 40 cm and a diameter if 5.0 cm?
A) +0.20 diopters B) +2.5 diopters C) +2.7 diopters D) +20 diopters E) -2.5 diopters