If you strip electrons from an atom, the atom becomes a
A) positive ion.
B) negative ion.
C) different element.
Answer: A
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Motion of the plates of Earth's crust is thought to be due to
a. the solar wind. b. convection from the hot interior. c. tides in the oceans. d. friction between wind and the land surface. e. Earth's magnetic field.
A mass of 50. kg is suspended from a steel wire of diameter 1.0 mm and length 11.2 m. How much will the wire stretch? (The Young's modulus for steel is 20 × 1010 N/m2.)
What will be an ideal response?
What is the conversion factor between km/h and m/s?
A) 7.72 × 10-5 m/s B) 2.78 × 10-1 m/s C) 1.30 × 104 m/s D) 3.60 m/s E) 16.7 m/s
The two nuclei used for the fuel in fission bombs are
A) 235Th and 235U. B) 234Th and 238U. C) 235U and 239Pu. D) 238U and 239Pu. E) 234Th and 239Pu.