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5. A potential energy fumction for a two-dimensional force is of the fornV-3y-7t FPind the force that acts at the point (o, y).
6. The 200 g particle (Fig. 4) is released from point A at rest. The radus is 30㎝. The speed of the particle at point B is 1.5 m/s. (a) What is its kinetic energy at B? (b) How much energy is lost as a result of friction as the particle goes from A to B? (c) Is it possible to determine u from these results in any simple manner? Explain. Figur CA Eaplain Figure 4
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Answer #1

(5)

Force is given by,

F = -dU / dx + (-dU / dy)

F = d(3x3y - 7x) / dx - d(3x3y) / dy

F = (9x2y - 7) i - (3x3) j

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