A vector has components Ax > 0, and Ay < 0, the angle that this vector makes with the positive x-axis must be in the range
A) 0° to 90°.
B) 90° to 180°.
C) 180° to 270°.
D) 270° to 360°.
D
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Why do sunspots appear dark in pictures of the Sun?
A) They are too cold to emit any visible light. B) They are holes in the solar surface through which we can see through to deeper, darker layers of the Sun. C) They are extremely hot and emit all their radiation as X-rays rather than visible light. D) They actually are fairly bright, but appear dark against the even brighter background of the surrounding photosphere.
A rock attached to a string swings in a vertical circle. Which free-body diagram could correctly describe the force(s) on the rock when it is at the highest point, where 
is the normal force, 
is weight, and
data-wiris-created="true" src="https://sciemce.com/media/2/ppg__cognero__Chapter_6_Applications_of_Newton_apos_s_Laws_of_Motion.__media__e19b68f8-eb85-45b4-b469-7e72b4fc5ce9.PNG" style="vertical-align:middle;" /> is tension? A.
B.
C.
D.
E.
The condition for total internal reflection can be predicted from Snell's law since
A) the index of refraction of glass is about 1.5. B) the index of refraction of plastic is about 1.5. C) the value of tangent can be 1.0. D) the maximum value of the sine is 1.0. E) the maximum value of the sine is 1.5.
Chromatic aberration in lenses is due to the
A) reflection of light by the lens. B) refraction of light by the lens. C) dispersion of light by the lens. D) polarization of light by the lens. E) None of the other choices is correct.