Sheldon is trying to fry Leonard’s brain and is channeling a circular radioactive wave whose radius increases at 7 cm/ s. If Leonard is 200 cm east and 350 cm north of Sheldon, how long does it take for Sheldon’s wave to reach Leonard?

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Differential Equations

Have you ever observed the movement of the satellites and rockets or how the planets go around the sun in their orbits? How will you determine their motion? Definitely they follow some scientific laws and these kinds of problems are framed as differential equations.