Studies of multiplanet exoplanet systems have shown us that other planetary systems can sometimes differ from ours by
A) having their planets packed much closer to each other than our solar system's planets
B) exist in binary star systems
C) containing planets with much lower masses
D) two of these
D
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Suppose that several projectiles are fired upward. Which one will be in the air longest? (R is range, h is highest elevation, and t is time of flight.)
A) The one with the farthest range, R B) The one with the highest maximum elevation, h C) The one for which the product of (R)(t)(h) is maximum D) The one with the greatest initial velocity E) The one with the minimum elevation, h
As Kepler's first attempt to invent a theory that agreed with Tycho's data, he tried to "fit" the data for Mars to an orbit that was
A) an ellipse with the sun at one focus. B) a loop-the-loop, i.e., a circle within a circle. C) a circle with the sun at the center. D) an ellipse with Earth at one focus. E) a circle with Earth at the center.
A 1-kg ball is released from a height of 6 m, and a 2-kg ball is released from a height of 3 m. Air resistance is negligible as they fall. Which of the following statements about these balls are correct? (There could be more than one correct choice
) A) As they reach the ground, the 1-kg ball will have more kinetic energy than the 2-kg ball because it was dropped from a greater height. B) As they reach the ground, the 1-kg ball will be moving faster than the 2-kg ball. C) Both balls will reach the ground with the same speed. D) Both balls will reach the ground with the same kinetic energy. E) Both balls will take the same time to reach the ground.
At what frequency does a 10-?F capacitor have a reactance of 0.12 k??
What will be an ideal response?