Neglecting friction, a small ball and a similar large ball, at rest, are allowed to roll down an incline. for only one second. At this instant, the large ball will have a greater
A) potential energy.
B) kinetic energy.
C) speed.
D) all of the above
E) impossible to predict with the information given
Answer: A) potential energy.
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The modified form of Kepler's Third law allows astronomers to determine the Milky Way's ________.
A. shape B. composition C. number of spiral arms D. mass E. age
The sulfur hexafluoride molecule consists of one sulfur atom and six fluorine atoms. The atomic masses of sulfur and fluorine are 32.0 u and 19.0 u, respectively. One-half mole of this very heavy gas has what mass?
a. 32 g c. 146 g b. 73 g d. 608 g
A major factor limiting the use of single crystal gas turbine blades is ______________.
Fill in the blank(s) with the appropriate word(s).
Meteorites are valuable to astronomers because:
A) they may provide evidence about the process in which the solar system was born. B) they originated in other solar systems. C) they contain diamonds and gold. D) they reveal the contents of interstellar space. E) they prove that life can only exist on the Earth.