A hydraulic jack having a ram 150 mm in diameter lifts a weight of 25 kN under the motion of a 30 mm diameter plunger. The stroke length of the plunger is 250 mm and if it makes 100 strokes in keeping with minute, find by how much the weight is lifted per minute and what strength is required to force the plunger

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Basic Concepts of Water Resource Sustainability

The majority of the earth's surface is composed of water. The water which is available for use by the living beings on earth comes from various water resources. Water resources are the naturally occurring water bodies that are intended to be used by the living beings on earth for drinking and other uses. Water resources provide 3% as freshwater, 97% as saltwater, two-thirds of which are frozen as glaciers and ices. The remaining water which generally doesn't remain frozen are the water resources found underground, precisely known as groundwater. The majority of these water sources act as non-convention sources of power generation, like in hydropower stations.