The spring tides occur during the new and full lunar phases
a. True
b. False
Indicate whether the statement is true or false
True
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Molecular Speeds: The rms speed of a certain sample of carbon dioxide molecules, with a molecular weight of 44.0 g/mole, is 396 m/s. What is the rms speed of water vapor molecules, with a molecular weight of 18.0 g/mol, at the same temperature as the carbon dioxide?
A. 253 m/s B. 387 m/s C. 421 m/s D. 506 m/s E. 619 m/s
Which of the following statements about open clusters is true?
A) All stars in the cluster will evolve similarly. B) All stars in the cluster have approximately the same mass. C) All stars in the cluster are approximately the same color. D) There is an approximately equal number of all types of stars in the cluster. E) All stars in the cluster are approximately the same age.
The magnetic field at a distance of 2 cm from a long straight current-carrying wire is 4 ?T. What is the magnetic field at a distance of 1 cm from this wire?
A) 2 ?T B) 4 ?T C) 6 ?T D) 8 ?T E) 10 ?T
Which of the following objects is considered to possibly contain a black hole?
a. the central star of the Crab nebula b. the Orion nebula. c. LMC X-3 d. Algol e. PSR 1257+12