A lift sheave has a radius of 0.75 m. At what angular velocity must it be rotated if it is to raise the lift car at a vertical velocity of 1.8 m/s?

University Physics Volume 1
18th Edition
ISBN:9781938168277
Author:William Moebs, Samuel J. Ling, Jeff Sanny
Publisher:William Moebs, Samuel J. Ling, Jeff Sanny
Chapter10: Fixed-axis Rotation
Section: Chapter Questions
Problem 102P: A sphere of mass 1.0 kg and radius 0.5 m is attached to the end of a massless rod of length 3.0 m....
icon
Related questions
Question

answers:

Q27) 2.4

Q28) 0.84

Q29) 94KW

In a lift, the passenger car is suspended by a cable that is wrapped round a drive
sheave. The free end of the cable has counter weights attached. The lift is raised or
lowered by rotating the drive sheave. What do you think the function of the
counter weights are?
Source: Otis Elevator Company
A lift sheave has a radius of 0.75 m. At what angular velocity must it be rotated if it
is to raise the lift car at a vertical velocity of 1.8 m/s?
In the above question, the passenger car with passengers has a mass of 2500 kg
and the counter weights 2000 kg. If the power required to turn the sheave is 10.5
kW, what is the system efficiency?
An electric motor generates a torque of 300 Nm at 3000 rev/minute. What is its
power output?
Transcribed Image Text:In a lift, the passenger car is suspended by a cable that is wrapped round a drive sheave. The free end of the cable has counter weights attached. The lift is raised or lowered by rotating the drive sheave. What do you think the function of the counter weights are? Source: Otis Elevator Company A lift sheave has a radius of 0.75 m. At what angular velocity must it be rotated if it is to raise the lift car at a vertical velocity of 1.8 m/s? In the above question, the passenger car with passengers has a mass of 2500 kg and the counter weights 2000 kg. If the power required to turn the sheave is 10.5 kW, what is the system efficiency? An electric motor generates a torque of 300 Nm at 3000 rev/minute. What is its power output?
Expert Solution
steps

Step by step

Solved in 2 steps

Blurred answer
Knowledge Booster
Angular speed, acceleration and displacement
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.
Similar questions
  • SEE MORE QUESTIONS
Recommended textbooks for you
University Physics Volume 1
University Physics Volume 1
Physics
ISBN:
9781938168277
Author:
William Moebs, Samuel J. Ling, Jeff Sanny
Publisher:
OpenStax - Rice University
Classical Dynamics of Particles and Systems
Classical Dynamics of Particles and Systems
Physics
ISBN:
9780534408961
Author:
Stephen T. Thornton, Jerry B. Marion
Publisher:
Cengage Learning
Physics for Scientists and Engineers: Foundations…
Physics for Scientists and Engineers: Foundations…
Physics
ISBN:
9781133939146
Author:
Katz, Debora M.
Publisher:
Cengage Learning
Principles of Physics: A Calculus-Based Text
Principles of Physics: A Calculus-Based Text
Physics
ISBN:
9781133104261
Author:
Raymond A. Serway, John W. Jewett
Publisher:
Cengage Learning
Physics for Scientists and Engineers
Physics for Scientists and Engineers
Physics
ISBN:
9781337553278
Author:
Raymond A. Serway, John W. Jewett
Publisher:
Cengage Learning
Physics for Scientists and Engineers with Modern …
Physics for Scientists and Engineers with Modern …
Physics
ISBN:
9781337553292
Author:
Raymond A. Serway, John W. Jewett
Publisher:
Cengage Learning