A 6.0 cm tall object is placed 20 cm in front of a convex mirror with focal -100 cm focal length. Where is the image formed?
A. 80 cm behind the mirror
B. 25 cm behind the mirror
C. 17 cm behind the mirror
D. 17 cm in front of the mirror
E. 25 cm in front of the mirror
C. 17 cm behind the mirror
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A traveler pulls on a suitcase strap at an angle 36° above the horizontal. If of work are done by the strap while moving the suitcase a horizontal distance of 15 m, what is the tension in the strap?
A) 75 N B) 61 N C) 85 N D) 92 N
Which of the following cannot be described by a field?
A) gravitational forces B) electrical forces C) magnetic forces D) radiation pressure
Based on current evidence and models, visible, luminous matter (such as the stars within galaxies) amounts to approximately what percentage of the total mass and energy of the universe?
A) less than 1 percent B) 10 percent C) 25 percent D) 50 percent
What is true of spiral galaxies?
A) They are much less common at larger redshifts. B) They are relatively rare in regions of high galaxy density. C) They are only found in the center of rich galaxy clusters. D) They have never been seen to have large redshifts. E) They evolve from giant ellipticals.