Why are the temperature fluctuations observed in the cosmic microwave background are important?
What will be an ideal response?
The angular scale of the fluctuations indicates that the density of the universe is very close to the critical density. The variations in temperature are consistent with dark matter models.
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A 5.0-C charge is 10 m from a -2.0-C charge. The electrostatic force is on the positive charge is:
A) 9.0 × 108 N toward the negative charge B) 9.0 × 108 N away from the negative charge C) 9.0 × 109 N toward the negative charge D) 9.0 × 109 N away from the negative charge E) none of these
The property of growth and development appears to be
A) a necessary condition, but not a sufficient condition for life B) a sufficient condition, but not a necessary condition for life C) both a necessary condition and a sufficient condition for life D) neither a necessary condition nor a sufficient condition for life
A block of mass 5.00 kg rests on a horizontal surface where the coefficient of kinetic friction between the two is 0.200 . A string attached to the block is pulled horizontally, resulting in a 3.00 m/s2 acceleration by the block. Find the tension in the string. (g = 9.80 m/s2)
a. 0.200 N c. 19.8 N b. 9.80 N d. 24.8 N
Quantum tunneling occurs in
a. nuclear fusion. b. radioactive decay by emission of alpha particles. c. the scanning tunneling microscope. d. all of the above. e. only (b) and (c) above.