Rigid body Newton’s law homework

  • #1
Pipsqueakalchemist
138
18
Homework Statement
Problem and solution below
Relevant Equations
F = ma
Moment equation
For this problem I know how to get the answers but I have a few things I’m not 100% sure about. First how do we know that the rod is experiencing centripetal motion? Second, when using moment about point G how do we know that the angular acceleration is equal to zero? And third the radius is 0.4 because the two ends of the rod are in motion with radius of 0.4 right?
 

Attachments

  • 563A4A1F-6BDF-45C1-8521-D1844F89B42A.png
    563A4A1F-6BDF-45C1-8521-D1844F89B42A.png
    18.1 KB · Views: 153
  • 89C330BF-FD9C-48A7-A3CE-BF98367EB89B.png
    89C330BF-FD9C-48A7-A3CE-BF98367EB89B.png
    22.9 KB · Views: 172
Physics news on Phys.org
  • #2
1. Because 200 N + 300 N > mg
2. Because the ropes fix the angle of the rod ##\rightarrow## it can't rotate around G
3. Yes
Pipsqueakalchemist said:
I know how to get the answers
yea, because it seems you have a solutions manual at your disposition ? PF rules in fact require you to post your own attempt at solution :smile:
 
  • Like
Likes Lnewqban
  • #3
Well my test is on Monday and I still have another 10 question in the problem set. I can’t afford to get stuck on every single question.
 
  • #4
I see. Was my reply in #2 ok with you ?

##\ ##
 
  • #5
Yea I guess I see it. Since the bar isn’t rotating around point G or around any point on the bar itself so regardless of which point I chose the angular acceleration will always be zero right?
 
  • Like
Likes Lnewqban and BvU
  • #6
002-four-bar-linkages-4-728.jpg

TintedHelpfulAdeliepenguin-size_restricted.gif
 
  • #7
Hey you commented on my other post. The one with the tipping cabinet. Do you mind looking at it because I still have some confusion.
 
  • #8
Pipsqueakalchemist said:
Hey you commented on my other post. The one with the tipping cabinet. Do you mind looking at it because I still have some confusion.
Me too. :frown:
 
  • #9
Lol, yea Ik the signs don’t make sense
 

Similar threads

Replies
3
Views
1K
Replies
4
Views
914
Replies
1
Views
3K
Replies
5
Views
2K
Replies
6
Views
4K
Replies
3
Views
1K
Back
Top