A 3.0 cm tall statue is 48. cm in front of a biconvex lens (focal length 20. cm). (a) Is the image real or virtual? (b) How far is the image from the lens? (c) Is the image upright or inverted? (d) How high is the image?
What will be an ideal response?
(a) real
(b) 34. cm
(c) inverted
(d) 2.1 cm
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Ice has been discovered at Mercury's poles. How can it survive, given the planet's dayside temperature?
A. Parts of Mercury's poles are in permanent shadow. B. Mercury has an elliptical orbit that carries it far from the Sun. C. Mercury rotates such that one side of the planet always faces the Sun. D. Mercury's small size let the planet cool quickly.
Reorder the spectral sequence to include the L and T dwarfs. What is the new sequence?
What will be an ideal response?
Which of the following is NOT a possible value for the electric charge on an object?
A) 8 x 10-20 C B) 8 x 10-19 C C) 8 x 10-18 C D) 8 x 10-17 C E) 8 x 10-16 C
All of the most likely alternatives to water as a biological solvent are liquids at
A) higher temperatures B) lower temperatures C) lower pressures D) similar temperatures