A wire coat-hanger has no mechanical properties, as it comprises no moving parts, other than the atoms that form the metal from which it is made. Ideally, a wire coat-hanger would be stiff so as to withstand the weight of the coat (or article) hung from it without bending or becoming mishapen. It would also be diminutive in weight and size, in order to transport and store it easily.
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You can us a satellite or even a wire coat hanger.
In order to build a catapult you need a way to store energy. A spring, a bungee cord ect. In the medieval days they used tightly wound rope. I cannot see a way to store energy with a coat hanger.
To make a pulley, get a coat hanger. Cut the bottom of the hanger, and insert the open ends into an empty wooden spool. Adjust wire so spool turns easily, and then bend the ends so that the spool won't fall off. Hang rope on the spool. Attach one end of rope to a bucket or can. To use, hang the pulley and pull on the end with no bucket or can.
It is a term used to describe repairs or enhancements made with any materials that are available at little or no cost. This is often done on a temporary basis, and usually without regard to appearance.Some examples:repairing a rusted muffler bracket with a coat hanger.using duct tape to repair a broken alternator belt.using a coat hanger and aluminum foil as an antenna.The term is probably derived from "nigg*r rigged" and can be offensive.