PHYS_111_Hill_m87rich_Final_Fall_2006

PHYS_111_Hill_m87rich_Final_Fall_2006 - PHYSICS I 1I FIWAL...

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PHYSICS I1 I FI WAL EXAM FALL 2006 55. A rock is dropped from a cliff. Neglecting friction the kinetic energy increases as and as . 56. A box of mass 20 kg is given an initial speed of 10 m/s at the bottom of an inclined plane. See figure to the right. If the coefficient of friction between incline plane and box is 0.20, how far up the plane in the direction of the plane will the box travel? (a) 3.9 m (b) 5.4 rn m(d) 9.2 m (e) I I .I m 57. A 2000 kg car is moving around a circular track at a speed of 45 m/s as shown to the right. What is the centripetal force needed to keep the car moving in a circle? a 27x1 0 toward center of circle u (b) 27x1 0 N away from center of circle (c) 42x1 o3 N (d) 42x1 o3 N away from center of circle (e) 65x10~ N toward center of circle
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58. A 2.5 kg box starting from rest slides down a hill and compresses a large spring whose stiffness constant is I80 Nlm as shown in the figure to the right. How far is the spring compressed ? (a) 1.0 mG53(c) 2.0 rn (d) 2.5 m (e) 3.0 m 59. A 2000 kg car traveling west at 30 rnls collides with a 3000 kg truck traveling south at 25 mls. In the completely inelastic collision they lock bumpers and travel as a single object. What is the speed of the car truck combination after the collision? (a) 18 mls (c) 20 mls (d) 21 mls (e) 22 mls 60. A force of 5.0 N is applied to a 30 kg frictionless solid grinding wheel initially at rest as shown to the right. What will be the speed of the wheel after 12 s? (e) 3.7 revls illF 1 -,% GGva (b) 1.8 revls (c) 2.4 revls (d) 3.1 revfs 61. A heavy child sits down carefully on the edge of a slowly rotating merry-go-round.
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PHYS_111_Hill_m87rich_Final_Fall_2006 - PHYSICS I 1I FIWAL...

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