A rifle of mass 2 kg is suspended by strings. The rifle fires a bullet of mass 1/100 kg at a speed of 200 m/s. The recoil velocity of the rifle is about
A) 0.001 m/s.
B) 0.01 m/s.
C) 0.1 m/s.
D) 1 m/s.
E) none of the above
D
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What is the standard error of the estimate (i.e. the standard deviation of the residuals)?
Use the following data to answer the question.
Correlation between y and x: r = .584
Sample size: 20
Cobalt-60 is a radioactive isotope sometimes used in the treatment of cancer. Which of the following statements is true about an atom of cobalt-60?
A) It contains 27 neutrons. B) It contains 27 protons. C) It contains 60 neutrons. D) It contains 60 protons.
Adding more carbon dioxide to the atmosphere causes the concentration of carbonates in the ocean to
A. stay the same because of a positive feedback mechanism. B. increase. C. stay the same because of a negative feedback mechanism. D. decrease.
The only "Mediterranean" country that has no Mediterranean coast is
A. Spain B. Italy C. Portugal D. Greece