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$X-ray Diffraction (new)$

P211 Final Sample 1 11) An amusement park ride consists of a large vertical cylinder that spins about its axis fast enough that any person inside is held against the wall when the floor drops away. The coefficient of static friction between the person and the wall is μs, and the radius of the cylinder is R. The maximum period of revolution T such that a person won't slide down the wall is: A) Rμ s T = 2 4π g B) T = 4π 2 Rμ g s ω 2 C) T = 4π Rμ g s R N F s D) T = 4π 2 Rg μ s F g E) T = 4π 2 μ g s 12) Wheel A of radius r A = 5 cm is coupled by belt B to wheel C of radius r C = 24 cm. Wheel A increases its angular speed from rest at a constant rate of α A = 3.30 rad/s 2 . How long does it take wheel C to reach a rotational speed of ω C = 50 rev/s, assuming that the belt B does not slip? A) 40 s B) 145 s C) 457 s D) 665 s E) 914 s Page 6
P211 Final Sample 1 13) Each of the three helicopter rotor blades shown in the figure below is 5.20 m long and has a mass of 210 kg. The rotor is rotating at 200 rev/min (20.94 rad/s). If each blade can be considered to be a thin uniform rod, what is the kinetic energy of rotation of the entire blade assembly? A) 4.30 × 10 4 J B) 1.29 × 10 5 J C) 6.55 × 10 5 J D) 1.24 × 10 6 J E) 3.92 × 10 6 J 14) A merry-go-round of radius R = 2 m has a moment of inertia I = 200 kg m 2 , and is rotating at ω = 4 rev/min. A child whose mass is m = 30 kg jumps onto the edge of the merry-go-round, heading directly toward the center at 6 m/s. What is the new angular speed of the merry-go-round immediately after the child has boarded it? A) 1.76 rev/min B) 3.64 rev/min C) 2.50 rev/min D) 6.40 rev/min E) 4.00 rev/min Page 7
Page 1 and 2: P211 Final Sample 1 1) The figure b
Page 3 and 4: P211 Final Sample 1 5) Two masses a
Page 5: P211 Final Sample 1 9) If a 0.2 kg
Page 9 and 10: P211 Final Sample 1 17) A mass of 5
Page 11 and 12: P211 Final Sample 1 21) A flying sa
Page 13 and 14: P211 Final Sample 1 25) The transve

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