quizcircularagain_ General Physics_ 2023SU-PHYS-004A-101

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Feb 20, 2024

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7/25/23, 1:11 PM quizcircularagain: General Physics: 2023SU-PHYS-004A-101 https://sjeccd.instructure.com/courses/37200/quizzes/244103 1/10 quizcircularagain Due Aug 2 at 11:59pm Points 28 Questions 15 Available Jun 19 at 12am - Aug 2 at 11:59pm Time Limit None Allowed Attempts 2 Instructions Attempt History Attempt Time Score LATEST Attempt 1 310 minutes 21 out of 28  Answers will be shown after your last attempt Score for this attempt: 21 out of 28 Submitted Jul 25 at 1:11pm This attempt took 310 minutes. 2 attempts 50 mins Take the Quiz Again 2 / 2 pts Question 1 A uniform cylinder of radius R , mass M , and length L rotates freely about a horizontal axis parallel and tangent to the cylinder, as shown below. The moment of inertia of the cylinder about this axis is .

7/25/23, 1:11 PM quizcircularagain: General Physics: 2023SU-PHYS-004A-101 https://sjeccd.instructure.com/courses/37200/quizzes/244103 2/10 . MR . 2 . . 0 / 2 pts Question 2 Incorrect Incorrect If a dense, 20.0-kg object is falling in air at half its terminal velocity, what is the drag force on the object at this moment? 24.5 N 49.0 N 69.3 N 98.0 N 139 N 1 / 1 pts Question 3 Exhibit 10-1 The figure below shows a graph of angular velocity versus time for a woman bicycling around a circular track.

7/25/23, 1:11 PM quizcircularagain: General Physics: 2023SU-PHYS-004A-101 https://sjeccd.instructure.com/courses/37200/quizzes/244103 3/10 Use this exhibit to answer the following question(s). Refer to Exhibit 10-1. What is her angular displacement (in rad) in the first 8 minutes? 0 π 4 π 8 π 16 π 2 / 2 pts Question 4 A wheel starts from rest and rotates with a constant angular acceleration about a fixed axis. It completes the first revolution 6.0 s after it started. How long after it started will the wheel complete the second revolution? 9.9 s 7.8 s 8.5 s 9.2 s 6.4 s

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7/25/23, 1:11 PM quizcircularagain: General Physics: 2023SU-PHYS-004A-101 https://sjeccd.instructure.com/courses/37200/quizzes/244103 4/10 0 / 2 pts Question 5 Incorrect Incorrect The graph below shows a plot of angular acceleration in rad/s versus time from t = 0 s to t = 8 s. The angular velocity at t = 0 s is , CCW. The angular velocity, ω , at t = 8 s is 2 , CW. , CCW. , CW. , CCW. , CW. 2 / 2 pts Question 6

7/25/23, 1:11 PM quizcircularagain: General Physics: 2023SU-PHYS-004A-101 https://sjeccd.instructure.com/courses/37200/quizzes/244103 5/10 A solid sphere, a solid cylinder, a spherical shell, and a hoop all have the same mass and radius. Each are rolling on a horizontal surface with the same center of mass speed, and then they roll up identical inclines. Which one goes the greatest distance up its incline? the hoop the solid sphere the spherical shell the cylinder They all go the same distance up their inclines. 2 / 2 pts Question 7 Four identical particles (mass of each = 0.40 kg) are placed at the vertices of a rectangle (2.5 m × 4.0 m) and held in those positions by four light rods which form the sides of the rectangle. What is the moment of inertia of this rigid body about an axis that passes through the mid-points of the shorter sides and is parallel to the longer sides? 2.2 kg ⋅ m 2 2.8 kg ⋅ m 2 2.5 kg ⋅ m 2 3.1 kg ⋅ m 2 1.6 kg ⋅ m 2 2 / 2 pts Question 8

7/25/23, 1:11 PM quizcircularagain: General Physics: 2023SU-PHYS-004A-101 https://sjeccd.instructure.com/courses/37200/quizzes/244103 6/10 A thin uniform rod (length = 1.2 m, mass = 2.0 kg) is pivoted about a horizontal, frictionless pin through one end of the rod. (The moment of inertia of the rod about this axis is ML /3.) The rod is released when it makes an angle of 37 ° with the horizontal. What is the angular acceleration of the rod at the instant it is released? 2 9.8 rad/s 2 7.4 rad/s 2 8.4 rad/s 2 5.9 rad/s 2 6.5 rad/s 2 2 / 2 pts Question 9 A wheel rotating about a fixed axis has an angular position given by θ = 3.0 − 2.0 t , where θ is measured in radians and t in seconds. What is the angular acceleration of the wheel at t = 2.0 s? 3 − 1.0 rad/s 2 − 24 rad/s 2 − 2.0 rad/s 2 − 4.0 rad/s 2 − 3.5 rad/s 2 0 / 3 pts Question 10 Incorrect Incorrect

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7/25/23, 1:11 PM quizcircularagain: General Physics: 2023SU-PHYS-004A-101 https://sjeccd.instructure.com/courses/37200/quizzes/244103 7/10 The first of two identical boxes of mass m is sitting on level ground. The second box is sitting on a ramp that makes an angle with the ground. When a force of magnitude F is applied to each box in a direction parallel to the surface it is on, upwards on the box on the ramp, neither box moves. Which statement comparing the friction force on the box on the level, F , to the friction force on the box on the ramp, F , is correct? s,L s,R F = F . s,R s,L F > F . s,R s,L F < F . s,R s,L The coefficient of static friction is needed to determine the correct answer. Depending on the values of the coefficient of static friction, the angle of elevation of the ramp, the mass of the boxes, and the applied force, answers (a), (b), and (c) are each a possible correct answer. 1 / 1 pts Question 11 An airplane flies in a horizontal circle of radius 500 m at a speed of 150 m/s. If the plane were to fly in the same 500-m circle at a speed of 300 m/s, by what factor would its centripetal acceleration change? 0.25 0.50 1.00 2.00 4.00

7/25/23, 1:11 PM quizcircularagain: General Physics: 2023SU-PHYS-004A-101 https://sjeccd.instructure.com/courses/37200/quizzes/244103 8/10 2 / 2 pts Question 12 Which of the following diagrams shows the greatest magnitude net torque with a zero net force? All the rods, of length 2 r , rotate about an axis that is perpendicular to the rod and fixed in the center of the rod. All the forces are of magnitude F or 2 F and all distances from the axis are r or r /2. 2 / 2 pts Question 13 A uniform rod (mass = 2.0 kg, length = 0.60 m) is free to rotate about a frictionless pivot at one end. The rod is released from rest in the horizontal position. What is the magnitude

7/25/23, 1:11 PM quizcircularagain: General Physics: 2023SU-PHYS-004A-101 https://sjeccd.instructure.com/courses/37200/quizzes/244103 9/10 of the angular acceleration of the rod at the instant it is 60 ° below the horizontal? 15 rad/s 2 12 rad/s 2 18 rad/s 2 29 rad/s 2 23 rad/s 2 2 / 2 pts Question 14 A spring ( k = 600 N/m) is placed in a vertical position with its lower end supported by a horizontal surface. The upper end is depressed 20 cm, and a 4.0-kg block is placed on top of the depressed spring. The system is then released from rest. How far above the point of release will the block rise? 46 cm 36 cm 41 cm 31 cm 20 cm 1 / 1 pts Question 15 A small sphere attached to a light rigid rod rotates about an axis perpendicular to and fixed to the other end of the rod. Relative to the positive direction of the axis of rotation,

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7/25/23, 1:11 PM quizcircularagain: General Physics: 2023SU-PHYS-004A-101 https://sjeccd.instructure.com/courses/37200/quizzes/244103 10/10 the angular positions of the sphere are negative, its angular velocity is negative, and its angular acceleration is negative. The sphere is rotating clockwise and slowing down. rotating counterclockwise and slowing down. rotating clockwise and speeding up. rotating counterclockwise and speeding up. first rotating counterclockwise and then clockwise. Quiz Score: 21 out of 28

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