Propulsion engines and aerodynamics. In slightly more detail it's down to the amount of thrust from the engines and the special shape of the body and wings of the plane that allows it to fly.
Less surface area contacting the ground reduces friction. Wheels are useful for moving heavy objects so you don't hurt your back.
objects sink because they are to heavy.
Yes, many Airbus aircraft are in the category of heavy aircraft.
can I operate heavy equipment or fly an airplane while on Xanax// If you are Impaired mentally, or Physically, NO !
Heavy objects are generally those that are difficult to lift or move without assistance, typically weighing more than 50 pounds. Examples of heavy objects include furniture, appliances, machinery, and equipment.
Moving heavy objects fast requires greater force, which can be difficult to generate quickly. Additionally, overcoming inertia and friction for heavy objects takes more effort and energy. Inadequate grip, balance, or coordination can also make it challenging to move heavy objects quickly without risking injury.
As heavy as they need to be, but it depends on the airplane: one C-17 wing weighs more than a whole Cessna.
Copper is heavy and not as strong as aluminium.
Pounds
objects sink because they are to heavy.
Yes, it is recommended to drill into studs when mounting heavy objects on the wall for better support and stability.
A plane with maximum takeoff weight over 300,000 pounds is identified as "heavy" in radio traffic. They do this because flying too close to a "heavy" airplane is more dangerous than flying too close to a "large" or regular-size airplane.