An object 3.4 mm tall is placed 25 cm from the vertex of a convex spherical mirror. The radius of curvature of the mirror has a magnitude of 52 cm. (a) How far is the image from the vertex of the mirror? (b) What is the height of the image?
What will be an ideal response?
Answer: (a) 13 cm (b) 1.7 mm
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On a graph of luminosity versus color for galaxies, shown below, many galaxies form a clump known as the "blue cloud." Why are galaxies in the blue cloud blue?
A) They contain hot, young stars that indicate active star formation. B) They are moving slower than galaxies in the red cloud. C) They contain lots of dust that cause the bluish color. D) They contain cold, dying stars that are fading to black. E) They are all moving toward us, causing them to be blueshifted.
A force of 12 N acts on a 2.0-kg object through a parallel distance of 1.5 m. How much work is done on the object?
At the time of the winter solstice (the start of winter), the Sun is
a. farthest south of the celestial equator. b. farthest north of the celestial equator. c. on the celestial equator moving north. d. on the celestial equator moving south.
A 5.0-kg object is pulled along a horizontal surface at a constant speed by a 15-N force acting 20° above the horizontal. How much work is done by this force as the object moves 6.0 m?
a. 78 J b. 82 J c. 85 J d. 74 J e. 43 J