A hydraulic power pack has an output rating of 0.9 litres per second at a constant pressure of 35.0 MPa. The power pack is to supply a hydraulic prop which has a cylinder with an internal diameter of 90 mm and the stroke length of the prop piston is 1.5 meters. Calculate the force that the prop will exert on the roof and the length of time it will take to reach full extension with this power pack

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Conservation of Energy

In physics, the rule of the conservation of energy states that energy doesn’t disappear from the atmosphere; instead, it changes its form from one type to another. Energy is one of the most important physical quantities in nature, and it cannot be created or destroyed — only transformed.