A person looks horizontally at the edge of a swimming pool. If its length is 5 m, and the pool is filled to the surface, to what depth (in m) could the observer see? (n for water is 1.33.)
a. 3.2
b. 4.4
c. 2.1
d. 1.0
e. 0.3
b
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Two converging lenses, the first with focal length 25 cm and the second with focal length 20 cm, are separated by 30 cm. A 4.0 cm tall object is placed 50 cm in front of the first lens. What is the height of the final image?
A. 4.0 cm B. 2.0 cm C. 8.0 cm D. 9.3 cm E. 1.0 cm
Which of the following statements about spectral types of stars is always true?
A) A star with spectral type G has a lower interior temperature than a star with spectral type B. B) A star with spectral type G has a lower mass than a star with spectral type B. C) A star with spectral type G has a cooler surface temperature than a star with spectral type B. D) A star with spectral type G has a smaller radius than a star with spectral type B. E) All of the above are true.
For an astronaut working outside a spaceship, the greatest loss of heat would occur by means of
a. conduction. b. convection. c. radiation. d. conduction and convection. e. conduction and radiation.
Why have refrigerators been the focus of so much research in lowering energy use?
What will be an ideal response?