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        "intro": "<p dir=\"ltr\">Many models of engineering systems involve the <strong>rate of change<\/strong> of a quantity. There is thus a need&nbsp;<span style=\"font-size: 0.9375rem;\">to incorporate derivatives into the mathematical model. These mathematical models are examples&nbsp;<\/span><span style=\"font-size: 0.9375rem;\">of <strong>differential equations<\/strong>.<\/span><\/p><p dir=\"ltr\">Accompanying the differential equation will be one or more conditions that let us obtain a unique&nbsp;<span style=\"font-size: 0.9375rem;\">solution to a particular problem. Often we solve the differential equation first to obtain a general&nbsp;<\/span><span style=\"font-size: 0.9375rem;\">solution; then we apply the conditions to obtain the unique solution. It is important to know which&nbsp;<\/span><span style=\"font-size: 0.9375rem;\">conditions must be specified in order to obtain a unique solution.<\/span><\/p>",
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            "heading": "Newton's Law of Cooling",
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