Depends on what's wrong with it. Here's a helpful link.http://www.parktool.com/repair/
the faster the speed of the bicycle,the brighter the lamp
Yes
The speed ratio of a bicycle is the (gear ratio* radius of the wheel)/ Length of the pedal arm.
Braking reduces speed.
The output from the dynamo varies with the speed of the bicycle. And as a geared bicycle is likely(but don't have to) travel a bit faster than the single speed, it may produce a bit more electricity.
You fasten it to the back of your car.
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It is recommended that you wear a helmet, but it is not a legal requirement
A person who repair bikes is a bicycle mechanic. A shop that handles bikes is a bicycle shop or a bicycle store.
Yes but it is hard you may want to take it to a welding shop because they might be able to fix it but they may not know how to so it would be easiest to get a new bicycle.
The top speed for a bicycle depends on the rider (strength, stamina, coordination, muscle speed), the gearing of the bicycle, and the terrain it is being ridden over. The current record speed is 268.831 km/h - which was set on a specially designed bicycle ridden behind a dragster (to eliminate most of the air drag) on October 3, 1995 on the Bonneville Salt Flats in Utah, USA.
Walking speed Bicycle speed Automobile speed Train speed Airplane speed Rocket speed