A converging mirror with a focal length f forms an image of the moon. Where is the image?
A. Very close to f behind the mirror
B. At the surface of the mirror
C. At the radius of curvature of the mirror
D. Very close to f in front of the mirror
Ans: D. Very close to f in front of the mirror
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Friction: A 55-kg box rests on a horizontal surface. The coefficient of static friction between the box and the surface is 0.30. A horizontal 140-N force is applied to the box. What is the friction force on the box?
A. 140 N B. 160 N C. 16.5 N D. 0.00 N E. 42 N
How can we explain the presence of extrasolar planetary systems with Jovian-sized planets at distances at which we normally find terrestrial planets?
A) they are brown dwarfs that were captured by their parent stars B) these are massive terrestrial planets that formed close to their parent stars C) they are Jovian planets that were spun out from their rapidly spinning parent stars D) the Jovian planets formed farther out and then migrated inward
Describe the changes in the Sun from beginning to end of a sunspot cycle
What will be an ideal response?
P seismic waves can travel through ______________
a. solid material b. liquid c. gas d. plasma e. solid and liquid material