scribeye: kepler's 3 laws

hi guys . :)

Today we watched a video entitled "Kepler's 3 laws", where we were given a set of questions about and the answers are:

1. Copernican model

2. Mars

3. 8 minutes of arc / 1/4 apparent width of moon

4. Ellipse

5. Yes

6. focus

7. fireplace

8. poverty; illness

9. to see Tycho Brahe @ Denmark and he wanted to use astronomical data.

10. astronomy

11. he stole'em

12. no

13. planets were moving/spinning while orbiting around the sun (i just made that up but i think thats right :D)

14. 900 pages

15. mars is seen in the same position as if you were on the sun or earth.

16. Yes

17. Greeks

18. Yes

19. eccentricity is how flat the ellipse is.

20. Kepler's 3 laws:

• Planets move around the Sun in ellipses, with the Sun at one focus
• The line connecting the Sun to a planet sweeps equal areas in equal times.
• The square of the orbital period of a planet is proportional to the cube (3rd power) of the mean distance from the Sun (or in other words--of the"semi-major axis" of the ellipse, half the sum of smallest and greatest distance from the Sun)

21. Kepler told people's fortunes (astrology)

-- aaaaaand quizzes from last friday were also returned! if you weren't able to check for corrections here are the answers. :)

1. arrowhead facing down for instantaneous velocity and acceleration has an arrow towards the center of the circle.

2. the tension of the second yoyo string is twice the tension of the first one.

3. a. 13 m/s

b. 39 m/s2

4. 0.098 m.

5. up arrow- fair ; down arrow- gravitational force ; left arrow- centripetal force

6. neither.

7. 63.7 J

8. 14 J

9. 13500 J

10. 36 J

11. a. 296 N/m

b. 0.95 J

c. 0.1036 J

12. 3,594 J

13. i didnt get that sorry. :''<

-- and last! tomorrow we're doing a lab activity, so seeyou guys .:)

--next scribe will be, VAMP. goodluck!