My Math Forum  

Go Back   My Math Forum > Science Forums > Physics

Physics Physics Forum


Reply
 
LinkBack Thread Tools Display Modes
June 30th, 2012, 11:51 AM   #1
Senior Member
 
Joined: Oct 2009

Posts: 895
Thanks: 1

A shaft is uniformly accelerated from 10rev/s to 18 rev/s in

A shaft is uniformly accelerated from 10rev/s to 18 rev/s in 4 sec .
The shaft continues to accelerate at this rate for the next 8 sec . Thereafter the shaft rotates with a uniform angular speed . Find the total time to complete 400 rev .

In fact we solved this question , but I face some confused .. I want just complete my answer ...


the displacement and number of revolution at t = 12
Q = w0t + 1/2at^2
Q = 1658 rad
Re = 264 rev

velocity w at t = 12
w = w0 + at
w= (20Pi )+(4pi)(12)
w = 213.62 rad/s

so t when reach 400 rev at Q = (400 X 2Pi ) = 2513 =
t = (Q/w)
= (2513/ 213.62) = 11 (why not come 4 ) a
r-soy is offline  
 
June 30th, 2012, 11:54 AM   #2
Senior Member
 
Joined: Oct 2009

Posts: 895
Thanks: 1

Re: A shaft is uniformly accelerated from 10rev/s to 18 rev/

sorry now I know my mistake so
Q must (Q2 -Q 1 ) t= 4
r-soy is offline  
Reply

  My Math Forum > Science Forums > Physics

Tags
10rev or s, accelerated, rev or s, shaft, uniformly



Thread Tools
Display Modes


Similar Threads
Thread Thread Starter Forum Replies Last Post
A solid steel shaft is subjected to a torque of 45 KN/m. r-soy Physics 4 June 29th, 2012 09:28 AM
A shaft is uniformly accelerated from 10rev/s to 18 rev/s in r-soy Physics 6 May 26th, 2012 06:02 PM
sin(x^2) not uniformly continuous? summerset353 Real Analysis 1 March 1st, 2010 07:11 PM
not uniformly continuous rose3 Real Analysis 1 December 30th, 2009 04:38 AM
physics question dealing with uniformly accelerated motion floaty Physics 2 February 4th, 2009 07:13 PM





Copyright © 2019 My Math Forum. All rights reserved.