# English,maths,physics,chemistry

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Topic:machine,a block and tackle of 6 pulleys is used to raise a load of 300N steadily through a height of 30m.if the work done against friction is 2000J. calculate:the work done by effort,the efficiency of the system,the applied effort.

• physical science. -

I will be happy to critique your thinking on this.

• English,maths,physics,chemistry -

what effort would be needed to lift a load of 100n

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