7) A) Will a cannonball hit the ground at approximately the same location if it is fired in the same direction at an angle of 20 degrees and then at
an angle of 50 degrees?
B) What angle should one fire a cannon to achieve maximum range?

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. 

answer would be letter choice (a),   a ball resting on a shelf. would be another example of potential energy   >   stored energy > not moving.

a ball spinning on a finger   >   kinetic energy > moving energy

a ball rolling on the ground   >   kinetic energy   > moving energy

a   ball flying through the air   > kinetic energy   >   moving energy

hope that                                         : )

no

sodium is solid at rt