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What are the types of simple machine?

Name the different types of instruments used to measure atmospheric pressure.

Two different types of rubber are found to have the stree-strain curves shown in fig. (a) In which significant ways do these curves differ form the stree-strain curve of a metal wire. (b) A heavy machine is to be installed in a factory. To absorb vibrations of the machine, a block of rubber is placed between the machinery and the floor. which of the two rubbers A and B would you perfer to use for this purpose? why? (c) Which of the two rubber materials would you choose for a car tyre ?

Graphite powder is used in machines to

Why do we use simple machines?