The Hubble Space Telescope can detect Cepheids up to the distance of 100 Mpc
Indicate whether the statement is true or false
False
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In Figure 6-1, the block of mass m is at rest on an inclined plane that makes an angle ? with the horizontal. The normal force F acting on the block must be such that
A. F > mg cos?. B. F > mg sin?. C. F = mg cos?. D. F > mg. E. F = mg sin?.
What celestial line is a product of the Earth's orbit around the Sun?
A) Ecliptic B) Prime Meridian C) Equator D) Galactic Plane E) Analemma
A hot piece of iron is thrown into the ocean and its temperature eventually stabilizes. Which of the following statements concerning this process is correct? (There may be more than one correct choice.)
A) The change in the entropy of the iron-ocean system is zero. B) The entropy gained by the iron is equal to the entropy lost by the ocean. C) The entropy lost by the iron is equal to the entropy gained by the ocean. D) The ocean gains more entropy than the iron loses. E) The ocean gains less entropy than the iron loses.
Which two elements are most likely to combine with one another to form an ionic compound?
a. B and Cl b. Ra and Br c. Mg and Ca d. S and O