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12. A man drags a heavy load up an inclined plane as shown below. The pulley consists of two unequal disks; one is larger than the other. The man applies a constant force on the larger disk of radius R = 20 cm, and the load is dragged via a cord that wraps around the smaller disk of radius r = 10 cm. The surface of the incline is rough with µz = 0.4. a) What is the force required to pull the load at constant speed? b) What is the work done by the man on the pulley for two full rotations? cord c) If the cord suddenly breaks, what would be the angular acceleration of the pulley under the force of man? (Ipulley = 3.6 kgm²) 120 kg Answers: a) 379.37 N; b) 953.46J ; c) 21.08 rad/s? 15

12. A man drags a heavy load up an inclined plane as shown below. The pulley consists of two unequal disks; one is larger than the other. The man applies a constant force on the larger disk of radius R = 20 cm, and the load is dragged via a cord that wraps around the smaller disk of radius r = 10 cm. The surface of the incline is rough with µz = 0.4. a) What is the force required to pull the load at constant speed? b) What is the work done by the man on the pulley for two full rotations? cord c) If the cord suddenly breaks, what would be the angular acceleration of the pulley under the force of man? (Ipulley = 3.6 kgm²) 120 kg Answers: a) 379.37 N; b) 953.46J ; c) 21.08 rad/s? 15

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12. A man drags a heavy load up an inclined plane as shown below. The pulley consists of two unequal disks; one is larger than the other. The man applies a constant force on the larger disk of radius R = 20 cm, and the load is dragged via a cord that wraps around the smaller disk of radius r = 10 cm. The surface of the incline is rough with µz = 0.4. a) What is the force required to pull the load at constant speed? b) What is the work done by the man on the pulley for two full rotations? cord c) If the cord suddenly breaks, what would be the angular acceleration of the pulley under the force of man? (Ipulley = 3.6 kgm²) 120 kg Answers: a) 379.37 N; b) 953.46J ; c) 21.08 rad/s² 15°
Transcribed Image Text:12. A man drags a heavy load up an inclined plane as shown below. The pulley consists of two unequal disks; one is larger than the other. The man applies a constant force on the larger disk of radius R = 20 cm, and the load is dragged via a cord that wraps around the smaller disk of radius r = 10 cm. The surface of the incline is rough with µz = 0.4. a) What is the force required to pull the load at constant speed? b) What is the work done by the man on the pulley for two full rotations? cord c) If the cord suddenly breaks, what would be the angular acceleration of the pulley under the force of man? (Ipulley = 3.6 kgm²) 120 kg Answers: a) 379.37 N; b) 953.46J ; c) 21.08 rad/s² 15°
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