The image below shows a beam of radiation passing between two electrically charged plates. 
Which of the beams is due to a positively charged helium nucleus?
A. a
B. b
C. c
D. all of the above
E. none of the above
Answer: C
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Which of the following statements best describes a projected side benefit to human health from increased use of wind power?
a. Predatory birds usually leave an area where wind farms are established b. The reduction in use of coal to generate electricity will lower the amount of air pollutants from coal that kill up to 24,000 Americans per year and add climate-changing chemicals to the air c. Building of the turbine systems will help put Americans back to work. d. Less use of hydroelectric dams will allow us to consider more dam removals. e. More than one of the above answers is correct.
The ratio of river distance to straight-line distance is the sinuosity of the river. For straight streams it is less than 1.05, for winding and twisty streams is is between 1.05 and 1.5, for meandering streams, it is greater than 1.5. What value would you expect to find, based on the type of river this is? What value did you find?
What will be an ideal response?
Where are rotation centers of gyres located?
A. tropics B. equator C. arctic
The law of gravity states that two bodies attract each other with a force directly proportional to the product of their masses and inversely proportional to the ________ of the distance between them.
A. log B. first power C. cube D. square root E. square