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 Nm (2) 120 Nm (3) 480 N~m (4) 300 Nm (5) 360 Nm 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 Nm (3) 480 Nm (4) 300 Nm (5) 360 Nrn 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 Nm (2) 120 Nm (3) 240 Nm (4) 300 Nm (5) 360 Nm 31. An 80kg 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 4.2kg mass is placed at (3.0, 4.0) In. Where can an 8.4kg mass be placed so that the moment of inertia about the
zaxis 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 kgmz. If the bucket is raised to the top of the well and released, what is the
acceleration of the bucket as it falls toward thebottom 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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 Spring '06
 Buchler

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