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In a charming 19th-century hotel, an old-style elevator is

University Physics | 13th Edition | ISBN: 9780321675460 | Authors: Hugh D. Young, Roger A. Freedman ISBN: 9780321675460 31

Solution for problem 18E Chapter 9

University Physics | 13th Edition

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University Physics | 13th Edition | ISBN: 9780321675460 | Authors: Hugh D. Young, Roger A. Freedman

University Physics | 13th Edition

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Problem 18E

In a charming 19th-century hotel, an old-style elevator is connected to a counterweight by a cable that passes over a rotating disk 2.50 m in diameter (?Fig. E9.18?). The elevator is raised and lowered by turning the disk, and the cable does not slip on the rim of the disk but turns with it. (a) At how many rpm must the disk turn to raise the elevator at 25.0 cm/s? (b) To start the elevator moving, it must be accelerated at What must be the angular acceleration of the disk, in rad/s2? (c) Through what angle (in radians and degrees) has the disk turned when it has raised the elevator 3.25 m between floors?

Step-by-Step Solution:

Solution 18E Step 1: Free body diagram is shown below. One revolution of the disk will lift the elevator by the distance of one circumference of the disk. 1 rev = * meters. Step 2: (a).w(rpm) = 25 cm/s *60 s/1 min) *1 m/100 cm) (1*rev/ 2.5* m) w(rpm) = 1.91 rpm

Step 3 of 4

Chapter 9, Problem 18E is Solved
Step 4 of 4

Textbook: University Physics
Edition: 13
Author: Hugh D. Young, Roger A. Freedman
ISBN: 9780321675460

The full step-by-step solution to problem: 18E from chapter: 9 was answered by , our top Physics solution expert on 05/06/17, 06:07PM. This textbook survival guide was created for the textbook: University Physics, edition: 13. The answer to “In a charming 19th-century hotel, an old-style elevator is connected to a counterweight by a cable that passes over a rotating disk 2.50 m in diameter (?Fig. E9.18?). The elevator is raised and lowered by turning the disk, and the cable does not slip on the rim of the disk but turns with it. (a) At how many rpm must the disk turn to raise the elevator at 25.0 cm/s? (b) To start the elevator moving, it must be accelerated at What must be the angular acceleration of the disk, in rad/s2? (c) Through what angle (in radians and degrees) has the disk turned when it has raised the elevator 3.25 m between floors?” is broken down into a number of easy to follow steps, and 114 words. University Physics was written by and is associated to the ISBN: 9780321675460. Since the solution to 18E from 9 chapter was answered, more than 807 students have viewed the full step-by-step answer. This full solution covers the following key subjects: disk, elevator, must, raised, cable. This expansive textbook survival guide covers 26 chapters, and 2929 solutions.

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