S Halliday, Fundamentals of Physics, 10e GENERAL PHYSICs 1-2 (PHY 201-202) Grade

Question

S Halliday, Fundamentals of Physics, 10e GENERAL PHYSICs 1-2 (PHY 201-202) Gradebook ORION Downloadable eTextbook gnment Chapter 07, Problem 006 A bead with mass 2.10 x 102 kg is moving along a wire in the positive direction of an axis The figure indicates the bead's postion at omes to 0.00s.1.x anis beginning at time Q, when the bead passes through x - O with speed 12.0 m/s, a constant force s, -200 s, and ty-3 3.00s. The bead momentanily stops at t-3.00 s. What is the kinetic energy of the bead at - 10.0 s? on the bead. 20 x (m) Shew Work is REQUIRED for this question n.Wark By accessing this Question Assistance, you will learn while you earm points based on the Point Potential Policy set by your instructor Question Attempts: 0 of 3 used SAVE FOR LATE Version 4.24 51 Show all

Explanation / Answer

Consider the point t = 3 s: the acceleration must be
a = v / t = -12m/s / 3s = -4 m/s² (that is, to the left)

So the particle begins at rest at t = 3 s; what's up 7 s later at t = 10 s?
velocity v = at = -4m/s² * 7s = -28 m/s (that is, to the left)
Then KE = ½ * 0.021kg * (28m/s)² = 8.23 J

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