Compared to yesterday, you did 3 times the work in one-third the time. To do so, your power output must have been
A) the same as yesterday's power output.
B) one-third of yesterday's power output.
C) 3 times yesterday's power output.
D) 9 times yesterday's power output.
E) 34 times yesterday's power output.
D
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A CD has a diameter of 12.0 cm. If the CD is rotating at a constant angular velocity of 20.0 radians per seconds, then the period of the rotational motion is
A. 0.314 s. B. 0.441 s. C. 0.582 s. D. 0.698 s. E. 0.750 s.
The smallest major planet in the solar system lacks
a. a surface. b. a solid surface. c. a moon. d. a gravitational field.
Why do we think that the solar system formed from a rotating, collapsing gas cloud that ended up as a disk orbiting the Sun?
a. Most of the planets revolve and rotate in the same direction and in the same plane. b. We see clouds of gas and dust in space with apparently young stars in them. c. We see disks around young stars. d. All of the above.
How is the "Fermi Paradox" normally stated?
A) Why are we here? B) Who are we? C) Where are we? D) Where is everybody?