A convex mirror has a focal length of magnitude f. An object is placed in front of this mirror at a point f from the face of the mirror. The image will appear
A) behind the mirror.
B) upright and reduced.
C) upright and enlarged.
D) inverted and reduced.
E) inverted and enlarged.
B
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The formula mg = kx describes a spring that is stretched by hanging an object on it. The constant k is called the spring constant. What are its units?
A) m s2/kg B) kg/s2 C) kg s2 D) s/m kg E) N m
In a spectroscopic binary system, the star showing the larger blue shift is:
A) cooler and receding the fastest. B) less massive of the pair and receding slower. C) more massive and approaching us. D) less massive and approaching us at this moment. E) hotter and receding faster.
Addition by 1. Components: Vector 
has a magnitude of 6.0 m and points 30° north of east. Vector 
has a magnitude of 4.0 m and points 30° west of north. The resultant vector 
+ 
is given by
A. 9.8 m at an angle of 64° east of north. B. 9.8 m at an angle of 26° north of east. C. 7.2 m at an angle of 26° east of north. D. 3.3 m at an angle of 26° north of east. E. 3.3 m at an angle of 64° east of north.
You throw a baseball horizontally, and Jill catches it. Neglect air resistance. The energy transformation that occurs during the catch is
A) kinetic E ? thermal E. B) thermal E ? kinetic E. C) kinetic E ? chemical E. D) chemical E ? kinetic E. E) chemical E ? gravitational E.