A ball is thrown vertically into the air. Because of air resistance, its time coming down compared with its time going up is
A) less.
B) the same.
C) more.
Answer: C
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When the energy state of an atom changes by ?E, the frequency of the photon emitted or absorbed is calculated by dividing ?E by ______________
Fill in the blank(s) with correct word
Why do we call dark matter "dark"?
A) It emits no radiation that we have been able to detect. B) It is dark brown or dark red in color. C) It blocks out the light of stars in a galaxy. D) It contains large amounts of dark-colored dust.
A(n) ______ is the page that your browser navigates to when you click a link in an ad, email, or other online promotion.
A. subsidiary B. home C. landing D. splash
The density of aluminum is 2700 kg/m3. An aluminum block has a mass of 2.5 kg. The buoyant force exerted on this block when it is completely submerged in water of density 1000 kg/m3 is approximately
A. 0.0091 N. B. 24.5 N. C. 2.5 N. D. 0.93 N. E. 9.1 N.