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

Physics & Space Science

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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

Physics & Space Science

Which of the following particles is made of two smaller particles?

a. electron c. photon b. proton d. None of these choices.

Physics & Space Science

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

Physics & Space Science

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

Physics & Space Science