The greenhouse effect occurs because carbon dioxide in the atmosphere absorbs ultraviolet radiation
Indicate whether the statement is true or false
F
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The classical model of the hydrogen atom that explains its spectral line structure is due to
A) Kirchhoff. B) Bohr. C) Fraunhofer. D) Newton. E) Mendeleev.
The idea that everything is made of small particles is
A) a useful idea that is known for certain to be true. B) still only a tentative speculation made by many scientists. C) a useful theory, but not known for certain. D) false and no longer used by scientists. E) not yet widely accepted.
A baseball is hit at ground level. The ball is observed to reach its maximum height above ground level 3.0 s after being hit. And 2.5 s after reaching this maximum height, the ball is observed to barely clear a fence that is 97.5 m from where it was hit. How high is the fence?
a. 8.2 m b. 15.8 m c. 13.5 m d. 11.0 m e. 4.9 m
A force of is exerted tangentially to a wheel of radius 0.340 m and causes an angular acceleration of 1.20 rad/s2. What is the moment of inertia of the wheel?
A) 4.78 kg ? m2 B) 3.59 kg ? m2 C) 5.98 kg ? m2 D) 7.17 kg ? m2