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pt21 Phy 101 2009

# pt21 Phy 101 2009 - Physics 101 FORM 0[l When a heavy...

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Physics 101 FORM 0 [l] When a heavy carton is pushed, it is more difficult to start moving it from rest than to keep it moving with constant velocity, because A] the normal force is greater when the carton is at rest [B] n s < \i^ (fcpA 1 * > (J'k [D] jj. s = fj, k [2] A mass of 40.0 grams is attached to a vertical spring with a spring constant k = 20.0 N/m and lowered slowly until the spring stops stretching. How much is the spring stretched? [A] 0.002 m (gj 0.0196m [C] 0.0816 m [D] 0.8 m [3] Jill of the Jungle swings on a vine 6.00 m long. What is the tension in the vine if Jill, whose mass is 50.0 kg, is moving at 2.80 m/s when the vine is vertical? [B] 602 N [C] 650 N [D] 663 N (51)556 N [4] An object of mass ra = 2.0 kg is pulled by a constant force P over a distance of 2.0 m in the +x direction. The force has a magnitude of 5.0 N, and it is directed at an angle of 30° with the +x direction. What is the work done by F? [A] 5.0 J f[Bj)8.7 J [C] 10 J [D] 17 J [5] What is the power needed to change the speed of a 1600-kg sport utility vehicle from 15.0 m/s to 40.0 m/s in 4.0 seconds? ^_^ [A] 110 kW [B] 183 kW [C] 218 kW ([Dj)275 kW [6] A force of 6 N is required to stretch a spring by 2.6 cm. How much must this spring be stretched in order for its potential energy to be 0.03 J?

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pt21 Phy 101 2009 - Physics 101 FORM 0[l When a heavy...

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