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When a spring is compressed, the energy changes from kinetic to potential. which best describes what is causing this change?
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In a heat of an engine, if 700 j enters the system, and the piston does 400 j of work what is the final internal (thermal) energy of the system if the initial energy is 1,500 j
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Sum of brother and sisters age is 26. four times the brothers age is subtracted from three times the sisters age, the difference is 8. what are the ages of the brother and sister?
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Describe at least two advantages and two disadvantages of using hydropower as a source of energy.
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Summarize the structure and function of the excretory system...
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