Dayton PHY 250 - GROUP Exercise 2d PHY 250

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Exercise 2d Group Number: Estimate of Angular Diameters Page 1 Names of members of lab group (alphabetical please) Coordinator(s): Acknowledged Members: Determine the angular width of the fingers or between the knuckles for each member of your group using techniques described in class. Group Member Name: What is being used for the angular measure? Angular width appropriate for this person: Group Member Name: What is being used for the angular measure? Angular width appropriate for this person: Group Member Name: What is being used for the angular measure? Angular width appropriate for this person: Group Member Name: What is being used for the angular measure? Angular width appropriate for this person: Group Member Name: What is being used for the angular measure? Angular width appropriate for this person:Exercise 2d Group Number: Estimate of Angular Diameters Page 2 1. Estimate the angular diameter of 3 objects on campus. You can use the "knuckle” or “finger” rule that you learned in class. Fill in the following information for each object. Brief Description of Object and it's location (ex: Door at main entrance to science center) Your location when you made the measurement Angular Diameter: Brief Description of Object and it's location (ex: Door at main entrance to science center) Your location when you made the measurement Angular Diameter: Brief Description of Object and it's location (ex: Door at main entrance to science center) Your location when you made the measurement Angular Diameter:Exercise 2d Group Number: Estimate of Angular Diameters Page 3 Check of your abilities. 2. Stand at the door to SC106 and look down the hall toward my office. There is a sign next to the door to my office with the names of the faculty who have offices in the suite which contains my office. Estimate the angular diameter of the sign. Next, measure the distance from the sign to where you are standing, and measure the actual width of the sign. Using the trigonometry you learned in class, determine the actual angular diameter of the sign from your position. Here is some information you might find useful: The small floor tiles are 9 inches square The bigger floor tiles are 12 inches square Distance to sign (show how you arrived at this result) Width of sign (show how you arrived at this result) Your estimate of the angular diameter of the sign (use knuckle rule) Angular diameter of sign (show your calculation in this box): 3. Estimate, to the best of your ability, the smallest angular diameter object that you can "see." EXPLAIN YOUR REASONING FOR YOUR CHOICE CLEARLY AND BRIEFLY.Exercise 2d Group Number: Estimate of Angular Diameters Page 4 4. Rank, in order from smallest angular diameter (ie, angular size) to largest angular diameter (ie, angular size), the following objects. Give a DETAILED explanation of how you arrived at your conclusions. The Science Center. Your friend’s head. The moon. O’Reilly Hall.Exercise 2d Group Number: Estimate of Angular Diameters Page 5 5. Assume each square on the above grid is 0.5 degrees by 0.5 degree. A circular object exists somewhere in space and is viewed from the earth by an observer to be 3 degrees by 3 degrees. Draw a circular object which is 3 degrees by 3 degrees somewhere on the grid. A second circular object has the same angular size, but is twice as far away as the first object. Draw this second object on the grid and identify the two as object #1 and object


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Dayton PHY 250 - GROUP Exercise 2d PHY 250

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