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69. . . Predict/Calculate A light spring with a force constant of 13 N/m is connected to a wall and to a 1.2-kg toy bulldozer,

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69. . . Predict/Calculate A light spring with a force constant of 13 N/m is connected to a wall and to a 1.2-kg toy bulldozer, as shown in FIGURE 6- 689. When the electric motor in the bulldozer is turned on, it stretches the spring for a distance of 0.45 m before its tread begins to slip on the floor. (a) Which coefficient of friction (static or kinetic) can be determined from this information? Explain. (b) What is the numerical value of this coefficient of friction? FIGURE 6-68 0.45 m Problem 69

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