AP Physics C: Mechanics, FRQ#1

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1

<p>Post your answers to this problem:</p>

<p>Mech. 1.</p>

<p>A 3.0 kg object is moving along the x-axis in a region where its potential energy as a function of x is given as U(x)=4.0x^2, where U is in joules and x is in meters. When the object passes the point x=-0.50m, its velocity is +2.0m/s. All forces acting on the object are conservative.</p>

<p>(a) Calculate the total mechanical energy of the object.</p>

<p>(b) Calculate the x-coordinate of any points at which the object has zero kinetic energy.</p>

<p>(c) Calculate the magnitude of the momentum of the object at x=0.60m.</p>

<p>(d) Calculate the magnitude of the acceleration of the object as it passes x=0.60m.</p>

<p>(e) On the axes below, sketch graphs of the object’s position x versus time t and kinetic<br>
energy K versus time t.Assume that x = 0 at time t = 0 . The two graphs should cover
the same time interval and use the same scale on the horizontal axes.</p>

<p>For complete view of all the FRQs(1,2,3) click here AP</a> Physics C: Mechanics, FRQs</p>

2

<p>a) 7 Joules
b) +/- sqrt(7/4) ~ +/- 1.32
c) can’t remember, but find the kinetic energy at that point using given formula and total mech energy, then find velocity, then plug into p=mv (5.something?)
d) -1.6 m/s^2</p>

<p>e) EPICFAILLLL</p>