Based on the results from Planck, the overall composition of the universe is
A) 100% ordinary (baryonic) matter.
B) 15% ordinary (baryonic) matter, 85% nonbaryonic dark matter.
C) 1% ordinary (baryonic) matter, 99% nonbaryonic dark matter.
D) 4% ordinary (baryonic) matter, 23% nonbaryonic dark matter, 73% dark energy.
D
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The single most important determinant of the temperature, density, radius, luminosity, and pace of evolution of a protostar is its:
A) chemical composition. B) magnetic field. C) spin. D) mass. E) molecular composition.
A 3.0-kg mass is dropped from the edge of a 50-m tall building with an initial speed of zero. The mass strikes the ground with a downward velocity of 25 m/s. Find the change in mechanical energy of the mass caused by air resistance between the point where it is dropped and the point where it strikes the ground.
A. ?0.46 kJ B. ?0.53 kJ C. ?0.61 kJ D. ?0.38 kJ E. ?0.81 kJ
Which of the following is true of Venus?
A) It is the smallest planet in the Solar System. B) It is the brightest natural object in the sky. C) It is about the same size as Earth. D) It is a self-luminous body that generates its own energy.
A nuclear reactor could explode like an atomic bomb
a. True b. False Indicate whether the statement is true or false