If electrons are stripped from an atom it becomes a

A) positive ion.
B) negative ion.
C) different element.
D) molecule.


Answer: A

Physics & Space Science

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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?

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The most abundant gas in the Earth's atmosphere is

A) helium. B) nitrogen. C) hydrogen. D) oxygen. E) water vapor.

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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.

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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

Physics & Space Science