The objective lens of an astronomical telescope has a focal length of 60 cm and the eyepiece has a focal length of 2 cm. How far apart should the lenses be placed in order to form a final image at infinity?
A) 44 cm
B) 58 cm
C) 76 cm
D) 60 cm
E) 62 cm
E
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The stratosphere is heated by
a. warm air rising from the troposphere. b. ultraviolet light from the Sun. c. convection. d. x-rays. e. all of the above.
A stock person at the local grocery store has a job consisting of the following five segments:
(1) picking up boxes of tomatoes from the stockroom floor (2) accelerating to a comfortable speed (3) carrying the boxes to the tomato display at constant speed (4) decelerating to a stop (5) lowering the boxes slowly to the floor. During which of the five segments of the job does the stock person do positive work on the boxes? A) (1) and (5) B) (1) only C) (1), (2), (4), and (5) D) (1) and (2) E) (2) and (3)
Why does Titan have such a nitrogen-rich atmosphere?
A) It was formed that way in the solar nebula. B) The nitrogen comes from the breakup of ammonia (NH3 ) by solar radiation and subsequent thermal escape of the hydrogen. C) The nitrogen was formed from the chemical reaction of sulphuric acid with surface rocks. D) Through the impact of nitrogen rich comets during the early solar system. E) The nitrogen was created through a chain of fusion reactions in Titan's core.
How did Copernicus's model of the Universe describe retrograde motion?
What will be an ideal response?