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The pulley system shown is at rest when the motor M starts pulling in rope so as to lift the 120lb cargo C. For the first second of operation, the motor can produce a tension in the rope of the form Fo(1 + 1/7), where Fo = 40lb. Neglect the inertia of the pulleys and of the rope. Use the impulse-momentum principle to find the value of r needed for the cargo C to travel upward with a speed of 10 ft/s after 1 s. Ans: T = 1.61 s C

The pulley system shown is at rest when the motor M starts pulling in rope so as to lift the 120lb cargo C. For the first second of operation, the motor can produce a tension in the rope of the form Fo(1 + 1/7), where Fo = 40lb. Neglect the inertia of the pulleys and of the rope. Use the impulse-momentum principle to find the value of r needed for the cargo C to travel upward with a speed of 10 ft/s after 1 s. Ans: T = 1.61 s C

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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The pulley system shown is at rest when the motor M starts pulling in rope so as to lift the 120 lb cargo C. For the first second of operation, the motor can produce a tension in the rope of the form Fo(1 + 1/7), where Fo = 40 lb. Neglect the inertia of the pulleys and of the rope. Use the impulse-momentum principle to find the value of r needed for the cargo C to travel upward with a speed of 10 ft/s after 1 s. Ans: 7 1.61 s M
Transcribed Image Text:The pulley system shown is at rest when the motor M starts pulling in rope so as to lift the 120 lb cargo C. For the first second of operation, the motor can produce a tension in the rope of the form Fo(1 + 1/7), where Fo = 40 lb. Neglect the inertia of the pulleys and of the rope. Use the impulse-momentum principle to find the value of r needed for the cargo C to travel upward with a speed of 10 ft/s after 1 s. Ans: 7 1.61 s M
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