A machine can be 100% efficient because some work is always lost do to

the answer would be c. motion and direction

i hope this : )

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. 

where is the photo and the answer choices?

e/c, where e is its total energy