George walks to a friends house. he walks 750 meters north, then realizes he walked too far. he turns around and walks 250 meters south. the entire walk takes him 13 seconds. what is his speed per second?

77 m/s in 2 significant figures

Explanation:

Total distance traveled (d) = 750 + 250 = 1000m

Time taken (t) = 13 s

Speed (s) = ?

Now,

s = d/t

s = 1000/13

s = 77 m/s in 2 significant figures

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.