If electrons are stripped from an atom it becomes a
A) positive ion.
B) negative ion.
C) different element.
D) molecule.
Answer: A
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Consider a velocity with components 36. m/s Westward and 22. m/s Northward. What is its magnitude and direction?
What will be an ideal response?
The most abundant gas in the Earth's atmosphere is
A) helium. B) nitrogen. C) hydrogen. D) oxygen. E) water vapor.
Which of the following experiments demonstrates the fact that the mere act of observation, or detection, causes changes in the microscopic world?
A) The detection of radioactive decay using a Geiger counter. B) The electron double-slit experiment with a detector placed behind one of the slits. C) The interference pattern that is detected on the screen in the electron double-slit experiment. D) The photoelectric effect that results from the detection of light. E) None of the above.
A 2.3-kg object traveling at 6.1 m/s collides head-on with a 3.5-kg object traveling in the opposite direction at 4.8 m/s. If the collision is perfectly elastic, what is the final speed of the 2.3-kg object?
A) 0.48 m/s B) 7.1 m/s C) 3.8 m/s D) 4.3 m/s E) 6.6 m/s