Data Record your data either in your lab notebook or in the tables below.
Table A
Oi
ar
sin e
sin ,
10°
20°
30°
45°
60°
75°

i don't know that i agree with that but what's the question ?

the working equation for the angular size is the product of the physical size and 360 degrees divided by the product of two pi and distance from earth. the minimum size would be 0.559 degrees while the maximum size would be 0.49 degrees. 

there are no contact forces mentioned on the list of choices that you've provided.

where is the