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MULTIPLE CHOICE QUESTIONS (2x10 = 20 points) Q1. A particle moves 3m along the circumference of a circle which has a radius of 1.5 m. 1) What is the angular displacement (C) of the particle? a. 2 rad b. 5 rad c. 6 rad d. 0.5 rad a 2) If the particle makes this trip in 2 s at a constant speed, what is its angular velocity? a. 2.5 rad/s b. 1 rad/s c. 3 rad/s d. 0.25 rad/s TO Q2. A circular disk of radius 10 cm is rotating with a constant angular acceleration of 1 rad/s2 and has an angular velocity of 2 rad/s at t = 0 s 3) Determine the disk's angular velocity at t = 5s a. 4 rad/s b. 0.5 rad/s c. 7 rad/s d. 2 rad/s 4) What is the angle it has rotated during this time? a. 20 rad b. 2.5 rad c. 7 rad d. 22.5 rad Q3. When opening a door, you push on it perpendicularly with a force of 50 N at 0.8 m from the hinges. 5) What is the torque you are exerting relative to the hinges? a. 40 Nm b. 50 Nm c. 80 Nm d. 100 Nm 6) If you push the door at 0.5m trying to get the same torque what should be the new force? b. 180 N c. 80 N d. 100 N Q4. A sphere of 2 kg and a radius of 0.25 m is rolling without slipping on the floor. If the sphere is moving at 2m/s 7) Assuming it's a solid sphere, find the rotational kinetic energy of the sphere. a. 140 N d. 10 J 8) Assuming it's a hollow spherical shell, find the rotational kinetic energy of the sphere c. 3.4 J d. 24 J a. 2J b. SJ a. 2.67 J