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img085 - 77777 77777 27 An object when orbiting the Earth...

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Unformatted text preview: 77777 77777 27. An object when orbiting the Earth at a height of three Earth radii from the center of the Earth has a weight of 3.00 N. What is the object’s mass? (9 at the surface of the Earth is 9.80 m/sz) (1) 2.76 kg (2) 1.34 kg (3) 0.920 kg (4) 0.306 kg (5) 0.102 kg 28. A vault is opened by applying a. force of 300 N perpendicular to the plane of the door, 0.800 m from the hinges. Find the torque due to this force about an axis through the hinges. @240 N-m (2) 120 N-m (3) 480 N~m (4) 300 N-m (5) 360 N-m 29. A vault is opened by applying a force of 150 N perpendicular to the plane of the door, 0.800 m from the hinges. Find the torque due to this force about an axis through the hinges. (1) 120 N~m (2) 240 N-m (3) 480 N-m (4) 300 N-m (5) 360 N-rn 30. A vault is opened by applying a force of 600 N perpendicular to the plane of the door, 0.800 m from the hinges. Find the torque due to this force about an axis through the hinges. (1) 480 N-m (2) 120 N-m (3) 240 N-m (4) 300 N-m (5) 360 N-m 31. An 80-kg man is one fourth of the way up a lO—m uniform ladder that is resting against a smooth, frictionless wall. If the ladder has a mass of 20 kg and it makes an angle of 60° with the ground, find the force of friction of the ground on the foot of the ladder. @ 1.7 x 102 N (2) 2.0 x 102 N (3) 50 N (4) 7.3 x 102 N (5)25 N fl A 4.2-kg mass is placed at (3.0, 4.0) In. Where can an 8.4-kg mass be placed so that the moment of inertia about the z-axis is zero? (1) There is no position giving this result. (2) (-3.0, 4.0)-m (3) (~60, -8.0) m (4) (~1.5, -2.0) m (5) (0.0, 0.0) m /34{ An object with mass m and moment of inertia I is spinning with an angular momentum L. Its kinetic energy is: (1) 0.5L2/I (2) 0.512/L (3) 0.5L2/m (4) 0.512/m (5) 0.5L2/I2 g1. A bucket of water with total mass 23 kg is attached to a rope, which in turn is wound around a 0.050—m radius cylinder at the top of a well. A crank with a turning radius of 0.25 m is attached to the end of the cylinder and the mament of inertia of cylinder and crank is 0.12 kg-mz. If the bucket is raised to the top of the well and released, what is the acceleration of the bucket as it falls toward the-bottom of the well? (Assume that cylinder turns on frictionless bearings.) (1) 3.2 m/s2 (2) 6.3 m/s2 (3) 7.4 m/s" (4) 9.8 m/s2 (5) 4.9 m/s2 35. Two point particles A and B of equal mass are located at some distance from each other. Particle A is at rest while B moves away from A at speed v. What happens to the center of mass of the system of two particles? 1 It moves with speed v/2 away from A It does not move It movw with speed v away from A It moves with speed v toward A 5 It movm with speed v/2 toward A 20 ...
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