बच्चे काम पर जा रहे हैं कविता के आधार पर बताइए कि बाल मजदूरी करने की विशेषता का क्या कारण है
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A vertical gate 5 m x 2.5 m in size and weighing 0.5 tonnes slides along guides fitted on the side walls of an overflow spillway at its crest. The coefficient of friction between the gate and the guide is 0.25. What force will be exerted at the hoisting mechanism to lift the gate when the head of water over the crest is 2.0 m?
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