Questions 21 to 23 are based on the following physical situation A conveyor belt collects sand and transports it to a height h as shown in the figure. The sand falls on the belt with negligible speed at constant rate u (mass per unit time). Friction between the belt and the sand particle is so high that the sand particles stop sliding almost instant- aneously after they hit the belt. Acceleration due to gravity is g. 21. What should speed of the belt be for the least possible driving force on the belt applied by the motor? (a) J0.5gh (c) /2gh (b) Jgh (d) A speed however small is possible. 22. What is the power delivered by the motor to the belt, when the motor is applying least possible driving force? (a) 0.5µgh (b) µgh (d) 2µgh (c) 1.5µgh 23. What is the power dissipated by the sand-belt system, when the motor is applying least poOssible driving force? (a) Zero (b) 0.25µgh (d) µgh (c) 0.5µgh

Questions 21 to 23 are based on the following physical situation A conveyor belt collects sand and transports it to a height h as shown in the figure. The sand falls on the belt with negligible speed at constant rate u (mass per unit time). Friction between the belt and the sand particle is so high that the sand particles stop sliding almost instant- aneously after they hit the belt. Acceleration due to gravity is g. 21. What should speed of the belt be for the least possible driving force on the belt applied by the motor? (a) J0.5gh (c) /2gh (b) Jgh (d) A speed however small is possible. 22. What is the power delivered by the motor to the belt, when the motor is applying least possible driving force? (a) 0.5µgh (b) µgh (d) 2µgh (c) 1.5µgh 23. What is the power dissipated by the sand-belt system, when the motor is applying least poOssible driving force? (a) Zero (b) 0.25µgh (d) µgh (c) 0.5µgh

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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