Where did the (E)=10J come from?
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Force F = - 10j N is exerted on a particle at r = (4î + 5j) m. What is the torque on the particle about the origin?
If 6 J of work is needed to stretch a spring from 10cm to 12cm and another 10J is needed to stretch it from 12cm to 14cm, what is the natural length of the spring?