What is the name for the universe model that has earth at the center?
Answer: Geo-centric
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The mass in the figure slides on a frictionless surface. If m = 2 kg, k1 = 800 N/m and k2 = 500 N/m, the frequency of oscillation (in Hz) is approximately
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A. 6. B. 2. C. 4. D. 8. E. 10.
The central core inside an atom is the neutron
Indicate whether the statement is true or false
Research has shown that Arctic plants are more injured by increased ultraviolet radiation than by global warming (see Ch. 17)
(77) The authors of the study say "there is a growing belief that ozone depletion is of only minor environmental concern because the impacts of UV-B radiation on plant communities are often very subtle. Here we show that 5 years of exposure of a subarctic heath to enhanced UV-B radiation both alone and in combination with elevated CO2 resulted in significant changes in the C:N ratio and in the bacterial community structure of the soil microbial biomass." What might this mean about the future Arctic ecology? Explain.
A vibrating guitar string emits a tone simultaneously with one from a 495-Hz tuning fork. If a beat frequency of 5.00 Hz results, what is the frequency of vibration of the string?
a. 2 480 Hz b. 500 Hz c. 490 Hz d. 250 Hz e. Either choice b or c is valid.