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Figure P18.14 shows a 1000-kg mass being lowered by a cable at a uniform rate of 4 m/s from a drum of 550-mm diameter weighing 2.5 kN and having a 250-mm radius of gyration. (a) What is the kinetic energy in the system? (b) The uniform rate of descent is maintained by a brake on the drum which applies a torque of 2698 N m. What additional brake torque is required to bring the system to rest in 0.60 s? 4m/s 1000 kg (d) FIGURE P18.14 Ans. Part a.) 9685 J Part b.) 2219 Nm

Figure P18.14 shows a 1000-kg mass being lowered by a cable at a uniform rate of 4 m/s from a drum of 550-mm diameter weighing 2.5 kN and having a 250-mm radius of gyration. (a) What is the kinetic energy in the system? (b) The uniform rate of descent is maintained by a brake on the drum which applies a torque of 2698 N m. What additional brake torque is required to bring the system to rest in 0.60 s? 4m/s 1000 kg (d) FIGURE P18.14 Ans. Part a.) 9685 J Part b.) 2219 Nm

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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solve not using energy method .. use sum of forces, torques (dynamics way) to solve 

Figure P18.14 shows a 1000-kg mass being lowered by a cable at a uniform rate of 4 m/s from a drum of 550-mm diameter weighing 2.5 kN and having a 250-mm radius of gyration. (a) What is the kinetic energy in the system? (b) The uniform rate of descent is maintained by a brake on the drum which applies a torque of 2698 N m. What additional brake torque is required to bring the system to rest in 0.60 s? 4m/s 1000 kg (d) FIGURE P18.14 Ans. Part a.) 9685 J Part b.) 2219 Nm
Transcribed Image Text:Figure P18.14 shows a 1000-kg mass being lowered by a cable at a uniform rate of 4 m/s from a drum of 550-mm diameter weighing 2.5 kN and having a 250-mm radius of gyration. (a) What is the kinetic energy in the system? (b) The uniform rate of descent is maintained by a brake on the drum which applies a torque of 2698 N m. What additional brake torque is required to bring the system to rest in 0.60 s? 4m/s 1000 kg (d) FIGURE P18.14 Ans. Part a.) 9685 J Part b.) 2219 Nm
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