Just like any other derailleur, by moving the chain sideways a certain distance when you pull at the shifter.
Just fine. Internally geared hubs are usually built around the same technique as found in automatic transmissions for cars, with something called planetary gears.
Get a high speed hub.
A coaster brake is hub based. Internally geared hubs. Some generators are hub based as well.
Yes you can, but the USB 3.0 hub will only work at the speed of the USB 2.0 port.
Yes. The road bikes and MTBs have multiple gears while the BMX and track bikes only have one.
Do you mean a network Hub? Then the answer is a network switch. Www.proskytv.com
No a hub will not speed up your connection, your connection is based on the ISP. A hub sends the information to every computer on the network until it finds the computer that sent the request.
It is inside the wheel hub. The whole wheel hub has to be replaced.. its sucks but if you know how to work on cars its not much harder to replace then a brake job..
The Generic USB Hub is a HI-SPEED USB device and will function at reduced speed when plugged into a non-HI-SPEED port
Rotor hub links the blades to the low-speed shaft
With great difficulty. For a bunch of reasons auto geared bicycles aren't well liked by riders, who'll most want to know when the gear change is about to happen. There's an old internally geared 2-speed hub by Bendix, there's a strange contraption with spinning counterweights hooked up to the hub and gearing mechanism and there's a high-end Shimano "comfort" bicycle with electronic shifting that can be set to automatic. But that's about it, and neither has been much of a success. If you're asking about bikes with engines, then the easiest thing to do is to sell your current one and buy one with an automatic transmission instead.
Passive
No, replace the entire hub.