if a person walks 1 km North, 5 km Southwest and 7 km east. find at the resultant displacement vector

a longitudinal wave moves energy that is to the direction of the wave’s movement. - true

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. 

r = ρ x length / area  

ρ = r x area / length  

ρ is in ohm-meters  

in basic units, it is m³kg/s³a²  

i think this is it.