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| Jackhammer |
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Rock breaking pneumatic hammer or rock drill.
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| Jaw crusher |
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A compression type crusher with consists of two metal plates that crush material as they close together. Typically used in primary crushing as a means of preparing rocks for subsequent crushing stages.
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| Joule (J) |
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1. A unit of energy equal to the work done when a force of one newton acts through a distance of one metre. One joule is equivalent to one watt second or 0.737 foot pounds. 2. A unit of electrical energy equal to the work done when a current of one ampere is passed through a resistance of one ohm for one second.
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