The same as it is now, except it would be on fire because the tunnel would go through the core.
for strength
An inverted U shape is the most common tunnel shape as this is the strongest.
A wind tunnel is used to simulate air flow over a model of an airplane or a wing section so it can be studied. The model can be instrumented to measure the lift and drag and other parameters for study. The wind tunnel can produce air flow at the desired speed and condition. Engineers may use a wind tunnel to study and design a wing shape. The Wright Brothers developed the first wind tunnel to design the shape of the wing for their airplane. Wind tunnels can be used to study interference between parts of the aircraft or between an airplane and a bomb as it drops away. There are different types of wind tunnels: low speed wind tunnels, supersonic wind tunnels and hyper-sonic wind tunnels.
It has an irregular shape.
the purpose is they can find the best shape to go with the wind
The earth's atmosphere can be imagined as the same relative thickness as the varnish on a model globe.
A conducting tip is brought very close to the surface of the object of interest Some electrons can "tunnel" through the space between the object and the conducting tip, creating a current. The way current varies as the tip is moved across the surface is used to determine the shape of the surface.
North Dakota is roughly the shape of a rectangle. The capital of North Dakota is Bismarck and the largest city in the state is Fargo.
atmosphere.
A teardrop is the most aerodynamically effective shape for a rocket travelling through the atmosphere. From an engineering standpoint, a cylindrical shape accommodates compressed gas cylinders (fuel and oxygen) most efficiently. For a rocket operating outside the atmosphere, shape is irrelevant because it will not encounter drag no matter how un-aerodynamic the shape.
The continents, countries, and bodies of water are distorted in their shape and size. They seem stretched between the North and South pole.
it makes the shape of a boot