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CCF08182010_00007

# CCF08182010_00007 - — Exam I—Morning Setiion H(A 990...

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Unformatted text preview: — Exam I—Morning Setiion H (A) 990 N (B) 1300 N (C) 2300 N F (D) 3000 N 67. What is most nearly the frictional force between the 80 kg block and the ramp? The coefﬁcient of static 50 N friction is 0.2, and the coefﬁcient of dynamic friction is 015- (A) 8.3 N (B) 13 N (C) 17 N (D) 25 N 80 kg 70. What is most nearly the maximum value of :0 such that F can be applied Without tipping the block? ([1, = a 0.4.) (A) 60 N (B) 80 N (C) 90 N (D) 120 N 68. Force F is gradually increased until the 20 kg block begins moving to the right. The 5 kg block is prevented (A) 1.5 m from moving by a cord. What is most nearly the mini— (B) 35 m mum force F for which movement is possible? (C) 4.4 m (D) 5.0 m 71. What is most nearly the component of velocity perpendicular to the wall after impact if the coefﬁcient of restitution is 0.8? V 3 (A) MN ‘ 4 50m/s (B) 59 N (C) 74N (A) 24 m/s (D) 81 N (B) 30 m/s (C) 32 m/s (D) 40 m/s 69. Most nearly, what force, F, is required to lift a 72. The velocity of a particle at time t is 50 N load? All pulleys are frictionless. Assume all 7 strands are parallel. v(t) = 12t4 + f — Professional Publications, Inc. ...
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