According to today's classification system, how many major planets are there in the solar system?
a. 10
b. 9
c. 8
d. 11
c
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If a freely falling object were equipped with a speedometer on a planet where the acceleration due to gravity is 20 m/s2, then its speed reading would increase each second by
A) 10 m/s. B) 20 m/s. C) 30 m/s. D) 40 m/s. E) depends on its initial speed
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
If you have one molecule of TiO2, how many molecules of O2 does it contain?
A) None, O2 is a different molecule than TiO2. B) One, TiO2 is a mixture of Ti and O2. C) Two, TiO2 is a mixture of Ti and 2 O. D) Three, TiO2 contains three molecules. E) none of the above
Which of the following particles is made of two smaller particles?
a. electron c. photon b. proton d. None of these choices.