Scientists from the National Aeronautics and Space Administration (NASA) envision that, in
the future, they will be able to create a 'space lift'. They plan to drop a ribbon-like material
called carbon nanotubes 100,000 km from a satellite in space to a platform in the Pacific
Ocean. From this platform, lifts attached to the carbon nanotubes would be able to transport
people into space.
(a) For the 'space lift' to work, the carbon nanotube must possess certain properties. In the
table below, fill in the reasons why the carbon nanotubes must have the given properties.
Physical property
Reason
Light
Strong
High melting point
(b) Given the physical properties of carbon nanotubes, suggest other applications for this
material.

most voltage drop calculators want the distance between the source and destination. then internally, they double it so both the source and return wires are calculated. but you need to know which distance the calculator uses so you're not half of what you should be or double what you should be.

most circuit breakers will not take a #6 directly, so the electrician will have to splice on a smaller pigtail. you also have to upsize the grounding wire when you upsized the ungrounded (hot) wire (see note in 250.122). this will preclude using most cable assemblies, as a cable with #6 copper will most likely only have a #10 grounding conductor. you need a #6 grounding conductor if the circuit is 20a. a #8 cable is no better, as it will have a #10 grounding conductor too. but most 20a breakers will take a #8 directly.

in your related post, you didn't say what type of load this is. if it is a light or heater, voltage drop won't be a big issue. if this is a motor, the current needs are huge at startup and the voltage drop can pose a problem. if this is a motor, knowing if the motor is under much load during startup will answer the voltage drop effect (a saw is easier to start than a compressor).

powerful computers now, not then