Which task requires more work?
A) lifting the 50-kg sack 2 meters
B) lifting the 25-kg sack 4 meters
C) both require the same
D) need more information
Answer: C
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A Diesel engine uses adiabatic heating to ignite the fuel
Indicate whether the statement is true or false
All magnetic forces are produced by
A) charges in motion. B) stationary charges. C) electromagnetic generators. D) permanent magnets. E) protons.
If a wave has a frequency of 12 Hz, it has a period of
a. 1/12 s. b. 3.5 s. c. 144 s. d. 12 s.
Go to the screen "Mars Mission Landing Sites," and and select Opportunity landing site (2004). Explore all five zoom levels offered, making sure to read the captions at the tops of the screens. Based on the information provided, why was the landing site,called Meridiani Planum, chosen for the Opportunity mission?
A. The region was in the only part of Mars that had not yet been explored. B. The region has very low elevation, and therefore might once have been in an ancient ocean. C. The region was already known to have very small rocks called "blueberries" that likely formed in liquid water. D. The region was already known to have minerals likely to have formed in liquid water. E. The region is near the Martian equator, which makes landing easier.