At least 70% of stars have planets. How many planets can astronomers reasonably claim exist in the Milky Way galaxy?
A) at least 70 billion B) at least 1 trillion C) at least 8 D) at least 3000
A
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A beam of light of two different wavelengths enters a pane of glass 3.00 mm thick at an angle of incidence of 56°. The indices of refraction for the two different colors are 1.514 and 1.528
Because of dispersion, the colored beams, although parallel, are separated by a small distance. How far apart are they? A) 0.057 mm B) 0.0083 mm C) 0.025 mm D) 0.014 mm E) 0.0062 mm
If the sum of the external forces exerted on an object is zero, then the sum of the external torques exerted on it must also be zero
A) True B) False
Three different-mass projectiles are launched at different angles of elevation from the top of a building. Each particle has the same initial kinetic energy. Which particle has the greatest kinetic energy just as it impacts with the ground?
a. The one launched at the highest angle of elevation. b. The one with the highest mass. c. The one with the lowest mass. d. They all will have the same kinetic energy on impact.
The longest living stars are those of
A) low mass. B) high mass. C) intermediate mass.