Insights Blog
-- Browse All Articles --
Physics Articles
Physics Tutorials
Physics Guides
Physics FAQ
Math Articles
Math Tutorials
Math Guides
Math FAQ
Education Articles
Education Guides
Bio/Chem Articles
Technology Guides
Computer Science Tutorials
Forums
Intro Physics Homework Help
Advanced Physics Homework Help
Precalculus Homework Help
Calculus Homework Help
Bio/Chem Homework Help
Engineering Homework Help
Trending
Featured Threads
Log in
Register
What's new
Search
Search
Search titles only
By:
Intro Physics Homework Help
Advanced Physics Homework Help
Precalculus Homework Help
Calculus Homework Help
Bio/Chem Homework Help
Engineering Homework Help
Menu
Log in
Register
Navigation
More options
Contact us
Close Menu
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Forums
Homework Help
Introductory Physics Homework Help
What is the Time to Pivot the Rod with a Spinning Disk?
Reply to thread
Message
[QUOTE="Michael Dennis, post: 5611693, member: 607930"] [h2]Homework Statement [/h2] A rod of length L = 20 m and mass m = 50 kg juts out perpendicular to a wall. The rod is designed to pivot vertically about the point where it intersects the wall. A massless pulley is affixed to the wall a height h = 10 m above the rod. A cable is attached to the rod a distance d = h from the wall-rod intersection. The cable slides over the pulley without friction and attaches at the other end to a disk of mass m = 20 kg and radius r = 50 cm on the wall next to the rod. The cable is pulled by turning this disk. [PLAIN]https://postimg.org/image/7kjejemmj/[/PLAIN] In the first Part of the question, I determined the Tension of the cable to be 693 N. I Cant figure out the second part of the question: "If the disk spins at 60 rpm, how long will it take to pivot the rod from horizontal to vertical?" [h2]Homework Equations[/h2][h2]The Attempt at a Solution[/h2] I attempted to Solve for time using w= w0 + at First I found inertia using the equation: 1/2 mR^2 > I= 2.5 Then I found alpha using: T=a*I=F*r > a= 138.6 I plug these number into the equation (60 rpm = 6.283 rad/s): 6.283= 0 +138.6*t > T=0.04 [/B] This number for time does not seem possible. What am i doing wrong? [/QUOTE]
Insert quotes…
Post reply
Forums
Homework Help
Introductory Physics Homework Help
What is the Time to Pivot the Rod with a Spinning Disk?
Back
Top