1. Lab 02
Astronomy 105 Laboratory

2. Night Lab: Sign up! Bring a calculator next week!

3. Ast 105 - Learning Teams/SI
SI – Ast Dr. Friedfeld

4. Astronomy 105 Laboratory
Lab 02

5. Scientific Measurements
Precision / Significant Figures
Physical quantities can never be measured with absolute precision
Scientific Notation
Useful for writing very big or very small numbers and simplifying math
Units
A measured quantity is meaningless without units ( 10 kilograms, 45 miles, 0.1 seconds)

6. How long is the rectangle in centimeters?
2 decimal places
How long is the rectangle in centimeters?
4.92 cm
estimated
How many significant figures? 3
What is the precision?
1/100 of a centimeter

7. Precision and Accuracy

8. Unit Conversion Convert 25 km hr to m s Conversions 1000 m=1 km
1 hr =3600 s
1000 m 1 km = 1 km 1 km
1 hr 3600 s = 3600 s 3600 s
1000 m 1 km =1
1 hr 3600 s =1
25 𝑘𝑚 ℎ𝑟 ∙ 𝑚 𝑘𝑚 ∙ ∙ ℎ𝑟 𝑠
25 𝑘𝑚 ℎ𝑟 ∙ 𝑚 𝑘𝑚 ∙ ∙ ℎ𝑟 𝑠
=6.9 𝑚 𝑠

9. Today’s Lab Exercise
Read discussion material carefully and work through all examples
Complete each “Exercise” in turn (don’t skip sections or jump ahead)

10. End

11. Empirical and Quantitative Skills Assignment
D2L – download exercise (word doc)
Complete exercise and save on your hard drive
Make a hard copy
Upload completed exercise to LiveText
This assignment will count as as a weekly exercise. No credit can be assigned (a grade of zero) until this assignment is uploaded to LiveText and the hard copy is completed and turned in by due date.
Due in one week – at class time
Video
D2L

12. Lab Quiz 02

13. The distance from the zenith to the celestial equator is equal to ____.
90°
180°
360°
your local latitude
your local longitude 1

14. due east and west points zenith All of the above
You can use the SC1 star chart to locate the stars and constellations visible for any date and time. Before using the chart you first must identify which of the following?
meridian
due east and west points
zenith
All of the above 28

15. The altitude of the north star above the horizon is equal to
it’s declination.
it’s right ascension.
the observers latitude.
the observers longitude. 23

16. all of the stars and constellations are visible
For tonight at 9 pm, approximately how many stars and constellations on the SC1 chart are visible in the night sky?
1/4
1/3
1/2
3/4
all of the stars and constellations are visible 1

17. The ______ is the apparent path of the sun through the sky.
ecliptic
meridian
celestial equator
zenith 30

18. Which of one of the following will not be discussed in today’s lab?
units
scientific notation
the orbit of Mercury
significant figures
precision of numbers 20

19. Which one of the following gives the most precise measurement of mass?
4 kg
4.0 kg
4.00 kg
4.000 kg 29

20. Clicker IDs
Clicker Registration

21. Night Lab: Sign up!

22. Night Labs
Sign up!

23. MasteringAstronomy - Review Material
Log into MA and Click on the “Study Area” tab
On the left side of the page click on “Math Review”
View the following clips. Scientific Notation Part1, Part 2 and Part 3
Working with Units Part 1, Part 2, Part Precision and Significant Digits Part 1, Part 2 and Part 3

24. Channel Setting Instructions for ResponseCard XR
Press and release the “MENU” button.
Scroll down to “Change Channel” using the “Yes” / ”No” buttons and press “Enter”.
Enter channel number “60” and press “Enter”.
This Message Appears if successful…
Channel Changed. √
Receiver Found.

25. Night Lab: Sign up. Bring a calculator next week
Night Lab: Sign up! Bring a calculator next week! Note: Review material for next week’s quiz located in the Study Area under Math Review on the MasteringAstronomy web site.

26. No LiveText assignment this semester – Ignore instructions on bottom of page 23.