Practice Exam 2

Practice Exam 2 - 1 Given the 3y3te3n a3 3hawn with 11k...

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Unformatted text preview: 1. Given the 3y3te3n a3 3hawn with 11k = [1.41, m1 = 10 kg and 1n; = 410 kg ﬁnd: A. The acceleration of the 3333mm 13:. 3.1 13332 {3111.3 13332 13:. 4.3 13332 13:. 3.1 1333 E. The ten3ian T 13:. 33.3 31 131133 31 131113 31 13;. 33.4 31 Uniform Circular Motion 2. Two Ina33e3 are tied together and one 13 tied to a center past an africtinnle33 table. The c3333 are of equal length. R = [1.25 In. Bath 1na33e3 rotate an the table making lﬂﬂ revalutian3 per minute. m1 = 1n; = 1 kg. (See Figure below} 31. What 13 the centripetal acceleration of m1 2 13:. 1.33 3: 111'3 13332 13:. 33.4 13332 13:. 3.33 13332 13:. 33.3 13332 B. What 13 the centripetal acceleration :1me 2 13134.3 3332 13:. 33.4 13332 13:. 13.3 13332 13:. 3.3 13332 C. What 13 the ten3ian TE ? (Hint: It 13 the net force an In; :1 13:. 34.3 31 13:. 33.4 31 13134.3 31 {31133.3 31 D. What 13 the ten3ian T1 ? (Hint: It, alone, 13 3333‘ the net force an m1 :1 {a} 541.3 N {h} 22.4 N {c} 51.5 N lid} 32.2 N 3ide View Top view Way 3. .41 small mass m = 1 ltg is released from rest on a frictionless tracl-t at a height H = 5 In as shown. The mass slides on the traclt following the path shown and eventually sttil-tes a spring. compressing it by an amount. d. 1-: = 1125 IWIn {See Fig. helowi A. What is the mechanical energy of the mass at the release point? {a} 49.0 .T {h} 24.5 J {c} 5.0 I {d} 33.1 J B. What is the grayitau'onal potenu'al energy of the mass when it is at point B as shown”? ﬁa} 0.0 J {13112251 {c} 1.25 I id} 61251 C. What is the kinetic energy of the mass just before it strikes the spring? {a}10.30] {h} sass J {c} 12.251 {in 35351 D. By how much is the spring compressed at point B? {a} 0.0? In {h} 0.04 In {c} 0.25 In {d} 0.14 In I- L1 1.11111 4. Work-Energy Theorem A 20-kg block is given an initial velocity yﬂ = 5.0 this and slides onto a horizontalJ frictional sur- face I:ka = 0.40} which is 2.5 In long and then back onto a frictionless surface. A} The iniu'al ltineu'c energy of the hlocl-t is {a} 50 J {h} 125 J {c} 250 J {d}12.6 J E} The net force on the hlocl-t while sliding over the frictional surface is ﬁa} 39.2 N {h} 30.4 N ﬁc} 210 N lid} 4 N C} The work. done by this net force is {a} -245J {h} -525 J {6190 I {d} -196J Di The ﬁnal speed of the block as it leaves the frictional surface is {a} 2.32 nus ﬁlo} 4.05 nus {c} 6.60 nus id} 1.06 nus ...
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Practice Exam 2 - 1 Given the 3y3te3n a3 3hawn with 11k...

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