Which of the following best describes the predominant scientific view of the origin of life on Earth?
A) We may never know precisely how life arose, but current evidence suggests that life probably can arise naturally under the conditions that prevailed on the early Earth.
B) Life probably migrated to Earth from some other world.
C) Life arose through a series of extremely unlikely chemical coincidences, making it seem almost miraculous that life ever came to exist at all.
D) We can describe with great certainty the precise steps by which life arose on Earth.
A) We may never know precisely how life arose, but current evidence suggests that life probably can arise naturally under the conditions that prevailed on the early Earth.
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A charged particle (mass = 4.0 ?g, charge = 5.0 ?C) moves in a region where the only force on it is magnetic. What is the magnitude of the acceleration of the particle at a point where the speed of the particle is 5.0 km/s, the magnitude of the magnetic field is 8.0 mT, and the angle between the direction of the magnetic field and the velocity of the particle is 60°?
A. 39 km/s2 B. 43 km/s2 C. 48 km/s2 D. 52 km/s2 E. 25 km/s2
Which is correct?
A.) 24 different kinds of quarks. B.) 12 kinds of quarks and the corresponding 12 kinds of antiquarks. C.) 24 kinds of antileptons. D.) 6 kinds of quarks and the corresponding 6 antiquarks, and 6 kinds of leptons and their 6 corresponding antileptons. E.) 3 quarks and the corresponding 3 antiquarks, 3 leptons and the corresponding 3 antileptons, and 12 other antileptons.
A container is filled with a mixture of helium (light molecules) and oxygen (heavy molecules) gases. A thermometer in the container reads 22°C. Which gas molecules have the greater average kinetic energy?
A) It is the same for both of the gases because the temperatures are the same. B) The oxygen molecules do because they are diatomic. C) The oxygen molecules do because they are more massive. D) The helium molecules do because they are less massive. E) The helium molecules do because they are monatomic.
Which of the following is true of the central bulge in the Milky Way?
A) It is a slightly flattened spheroid. B) It is a part of the disk component of the galaxy. C) It consists of spiral arms. D) It is a highly active region for star formation.