1) In the absence of friction, how much work would a child do while pulling a 12 kg wagon a distance of 4.3 m with a 22 N force? A) 109 J B) 52 J C) 67 J D) 95 J 2) A spring with a spring constant of 22 N/m is stretched from equilibrium to 2.9 m. How much work is done in the process? A) 47 J B) 93 J C) 186 J D) 121 J 3) 4.00 × 10^5 J of work are done on a 1,167 kg car while it accelerates from 10.0 m/s to some final velocity. Find this final velocity. A) 30.8 m/s B) 28.0 m/s C) 22.4 m/s D) 25.2 m/s
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Given: Force (F) = 22 N, Distance (s) = 4.3 m, Mass (m) = 12 kg Work (W) = Force x Distance W = 22 N x 4.3 m W = 95 J Show more…
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A little red wagon with mass 7.00 $\mathrm{kg}$ moves in a straight line on a frictionless horizontal surface. It has an initial speed of 4.00 $\mathrm{m} / \mathrm{s}$ and then is pushed 3.0 $\mathrm{m}$ in the direction of the initial velocity by a force with a magnitude of 10.0 $\mathrm{N}$ . (a) Use the work-energy theorem to calculare the wagon's final speed. (b) Cal- culate the acceleration produced by the force. Use this acceleration in the kinematic relationships of Chapter 2 to calculate the wagon's final speed. Compare this result to that calculated in part (a).
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