- How do you evaluate the Laplacian (The divergence of a gradient field (∇.∇

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A position given by:
r = [2.0m+(5.0m/s)t] i + [3.0-(1.0m/s^2)t^2] j,
What is the magnititude of the acceleration of the object at time t=2s? What is the range of this function and how do you find it? The function is f(n) = √(4-n^4)? If P(X) is this predicate: "x is a perfect square", then P(6) is true. True or False? What are some examples of useful traits that help animals survive? Need help finishing these chem equations
3-phenyl 2-propanol + permanganate=?
Fehling s solution + Ethanol= ?
Tollen s soltuion + Butanone?