A toy rocket, weighing 10. N, blasts off from ground level. At the exact top of its trajectory, its energy is 140. J. To what vertical height does it rise?
A) 1.4 m
B) 14. m
C) 12. m
D) 0.12 km
E) 1.4 km
B
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The Hubble Law does not work for nearby galaxies because
A. nearby galaxies are contracting rather than expanding. B. it is difficult to take the spectrum of nearby galaxies as compared to distant galaxies. C. the Hubble law works for all galaxies; distance doesn't matter. D. the speed of nearby galaxies is affected by their gravitational interaction with one another.
The ability of a telescope to show two very close objects separately is called its ________.
A. focal length B. light-gathering power C. resolving power D. magnification
For which of the following objects, each with the same kinetic energy, is the de Broglie wavelength the largest?
a. car b. planet c. electron d. house fly
Which of the following best describes a set of conditions under which archaeoastronomers would conclude that an ancient structure was used for astronomical purposes?
A) The structure has holes in the ceiling that allow viewing the passage of constellations that figure prominently in the culture's folklore, and many other structures built by the same culture have ceiling holes placed in the same way. B) They find that, looking out from the center of the building, there are two windows that align with the rise and set points of two bright stars. C) The structure has 29 straight lines pointing out from a center, just like there are 29 days in the lunar cycle. D) The structure has the same dome shape as modern astronomical observatories.