1) Based on its shape, which moon formed from a molten object?

      a. Titan

      b. Nereid

       c. Metis

        d. Hyperion

        e. Epimetheus

2) What is the surface gravity of Phobos compared to the Moon?

       a. 2.8x10-6

       b. 2.8x10-5

       c. 2.8x10-4

       d. 2.8x10-3

      e. 2.8x10+2

3) Escape velocity is the speed needed to escape the gravitational field of a planet or moon. Escape velocity, v, is given by the formula v2=2GM/R, where M is the mass of the moon and R is the radius. The escape velocity of the Earth is 11 km/sec. What is escape velocity of Phobos? (click here for an example)

        a. 11 km/sec

        b. 1 km/sec

        c. 100 m/sec

        d. 10 m/sec

        e. 1 m/sec

4) What is the escape velocity of Triton? (calculate this from the above formula)

        a. 10 m/sec

         b.200 m/sec

         c. 0.2 km/sec

         d. 1.4 m/sec

         e.1.4 km/sec

6) Which one of these moons is proably a captured asteroid

        a. Enceladus

        b. Dione

        c. Iapetus

        d. Phoebe

        e. Titan

7) Two moons, A and B, have the same size, but A has a density of 2.0 gm/cc and B has a density of 3.0 gm/cc. What is the ratio of their masses?

        a. 0.2

        b. 0.75

        c. 1

        d. 1.5

        e. 2

8) For the above moons, where are their probable locations in the Solar System (part of question 7)? 

     a. A and B are in the inner Solar System

     b. A and B are in the outer Solar System

     c. B is in inner Solar System and A is in the outer Solar System

     d. A is in inner Solar System and B is in the outer Solar System

     e. cannot determine from information given

9) Would Rhea sink in water?

     a. No

     b. Yes

10) Which of the following is true of shepherd moons

        a. their orbital periods are similar

        b. their orbital radii are similar

        c. they exchange angular momentum

        d. a and b

        e. all of the above

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1D Reason very irregular shape 4answer will be tit... View the full answer