Spike claims that dimensional analysis shows that the correct expression for change in velocity, 
, is 
, where m is mass, t is time, and F is the magnitude of force. Carla says that can't be true because the dimensions of force are 
data-wiris-created="true" class="Wirisformula" align="middle" />. Which one, if either, is correct?
A.
.B.
.C.
.D.
.E.
.Answer: C
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Star A has an apparent magnitude = 3 and star B has an apparent magnitude = 5. Which star is brighter in our sky?
A) Star A B) Star B C) There is not enough information to answer the question. D) The two stars have the same brightness in our sky, but Star A is closer to us than Star B.
The Earth is closer to the Sun in January than in July, which accounts for the fact that the highest high tides in the Northern Hemisphere occur in
A) winter. B) spring. C) summer. D) none of the above
Suppose that a particle is trapped in a box. How does the spacing in energy between adjacent energy levels change as the quantum number identifying a level increases?
A) The spacing decreases. B) The spacing alternately increases and decreases, depending on whether the wave function is a sine or a cosine function. C) The spacing remains constant. D) The spacing increases.
When you blow some air above the upper face of a paper strip, the paper rises. This occurs because
A) the air above the upper face of the paper moves faster, which makes the pressure lower than at the lower face. B) the air above the upper face of the paper moves faster, which makes the pressure higher than at the lower face. C) the air above the upper face of the paper moves slower, which makes the pressure lower than at the lower face. D) the air above the upper face of the paper moves faster but the pressure remains constant. E) the air above the upper face of the paper moves slower, which makes the pressure higher than at the lower face.