Approximately how long between the evolution of single versus multicellular organisms?
A) 4.5 billion years
B) two billion years
C) one billion years
D) 600 million years
E) 63 million years
B
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Power: A child pulls on a wagon with a force of 75 N. If the wagon moves a total of 42 m in 3.1 min, what is the average power delivered by the child?
A. 17 W B. 21 W C. 22 W D. 26 W
An achromatic lens
a. is used to correct spherical aberration in reflecting telescopes. b. is used to correct chromatic aberration in refracting telescopes. c. is used to correct spherical aberration in refracting telescopes. d. is used to correct chromatic aberration in reflecting telescopes. e. contains two mirrors and focuses the light back through the primary mirror.
Metric system: A certain CD-ROM disk can store 600 megabytes of information. If an average word requires 9.0 bytes of storage, how many words can be stored on one disk?
A. 6.7 × 107 words B. 5.4 × 109 words C. 2.1 × 107 words D. 2.0 × 109 words
Energy and Momentum: A railroad car collides with and sticks to an identical railroad car that is initially at rest. After the collision, the kinetic energy of the system
A. is the same as before. B. is half as much as before. C. is one third as much as before. D. is one fourth as much as before. E. is one quarter as much as before.