Just what it says, for hauling "cargo". They can haul just about anything the Army needs for war to include tanks, helicopters, trucks, people, and much more. During peacetime, they may carry relief supplies to disaster areas, or just general cargo from state to state, or country to country. The cargo planes air also used for aerial delivery of cargo (Air Drops).
The president
Under 'Valuable Air Cargo' in a plane.
Air Force One
The call-sign of Air Force One is reserved for any Air Force vehicles currently holding the President of the United States.
7 hours
On a US Air Force cargo plane, such as a C-5, the flight from Christchurch to McMurdo Station takes about eight hours.
The principle of lift is what allows a plane to stay in the air. When air flows over the wings of the plane, it creates a force called lift that pushes the plane upward. This force counteracts the force of gravity, keeping the plane airborne.
The drag force on a plane is caused by air resistance as the plane moves through the air. This resistance is due to the friction between the air molecules and the surface of the plane, which opposes the plane's forward motion.
the force is lift
The C-5 Galaxy cargo plane has loading ramps in both the nose and tail. This lets them load and unload much quicker than if they only had one ramp.
The plane that Reagan used is a Boeing 707 (passenger aircraft) , refitted for special use. It has the air force designation of VC-137 and called SAM 27000 as a presidential plane.
The plane used to transport the President is always called Air Force One, irrespective of which particular plane he's in. It is generally a Boeing 747-200 modified with special equipment such in-flight refueling. To be more technical, it is Air Force One if he is on an Air Force Plane, Marine One when he is on the helicopter, or Navy One if he is on a Navy plane. The "one" gives the aircraft priority in aviation hierarchy (the smaller the number, the higher the priority).