Chris Maloney

Answers to practice final exam

1. c                                 21.  257 lbs                                     

2. b                                22.  c:  go back and download the

3. b                                              final exam again: you need the

4. c                                               bold italicized info to get the

5. a                                                right answer (sorry)!

6. b                                23.   b

7. b                                24.   a

8. 10                              25. d

9. d                                26. T

10. e                              27. c

11. a                              28.  c

12. b                              29.  0.95 kg

13. a*                            30.  b

14. a*                             31.  a

15. c*                             32.  c

16. c                              33.  a

17. a                              34. c

18. c                              35. c

19.  c

20. b                              36. b

                                       37. c

                                       38.  b

                                       39.  a

                                       40.  c

Problems

Warning: if you merely memorize and repeat my responses to this section on your final exam you will receive NO CREDIT.  I must be certain when grading your exam that you ACTUALLY UNDERSTAND the information and are not just parotting my answers.  I can't emphasize this enough.  If you don't understand the information, PLEASE CALL or come see me this week in the office.  I will be happy to help you with any of the material before the exam.

1.  G = (d²F) / (m₁m₂)

2.  velocity, acceleration, force, momentum, electric field, magnetic field...

3.  Newton's first law:  An object in motion keeps its speed and direction the same unless acted upon by an external force.

     Newton's second law:  Force = mass x acceleration

     Newton's third law:  For every action force, there is an equal reaction force with the same magnitude and in the opposite direction.

4.  Isaac Newton discovered that the same force which causes an apple to fall to the ground (namely gravity) also can account for the orbit of the moon around the earth, the orbits of Jupiter's moons; and the orbits of all six planets known in his day.  All of this motion can be accurately described by combining Newton's first three laws with the universal law of gravity (see problem #1 and section 4.1 and following sections).

5.  First law of thermodynamics:  see section 7.4

      Second law of "":  see section7.5

      Conservation of momentum:  see section 3.3

6.

        A.  Go back to your notes and look for the parallax method.  If I give this question to you on the final, you should be prepared to explain it using a diagram.

        B.  The temperature of stars:  Remember that this is determined by the color of the star and its spectral class (this link goes  into considerably more detail than I did in class).For more information, see your notes, or chapter 29 about the HR diagram etc.

         C.    The mass of a star:   By applying  Newton's law of to the motion binary star systems (systems of two suns that orbit each other )  astronomers can

        7.  ...or here is a web resource on the HR diagram be sure to scroll down untill you see the HR diagram.