Acceleration: If the velocity of an object is zero at one instant, what is true about the acceleration of that object? (There could be more than one correct choice.)

A. The acceleration could be positive.
B. The acceleration could be negative.
C. The acceleration could be zero.
D. The acceleration must be zero.


Answer: C

Physics & Space Science

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Our modern theory of solar system formation—the nebular theory—successfully accounts for all the major features of our own solar system. However, when the first hot Jupiters were discovered, their existence seemed inconsistent with the nebular theory because this theory predicts that __________.

Fill in the blank(s) with the appropriate word(s).

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Which of the following is true of quasars?

A) They manifest very small redshifts. B) Their spectra are similar to stellar spectra. C) They represent the structure of galaxies as they are in the present time. D) Their luminosity is 10 to 1000 times the luminosity of a large galaxy.

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Uniform Circular Motion: A 20-g bead is attached to a light 120-cm-long string as shown in the figure. This bead moves in a horizontal circle with a constant speed of 1.5 m/s. What is the tension in the string if the angle ? is measured to be 25°?

A. 0.089 N B. 0.041 N C. 0.20 N D. 0.22 N E. 0.46 N

Physics & Space Science