Moment's question
Maths and statistics discussion, revision, exam and homework help.
This thread is sponsored by:
| Announcements | Posted on | |
|---|---|---|
| Important: please read these guidelines before posting about exams on The Student Room | 28-04-2013 | |
-
- Reputation:
- Thread Starter
- Exalted and Worshipped Member
- Location: 12 werter
- Posts: 987
Moment's questionDetermine the moment of the 60N force about point A on the perimeter of the disk by determining the lever arm of the force:
(Note, the lever arm is the perpendicular distance from the line of action of the force to the point where the moment is to be taken about)
Last edited by sulexk; 05-04-2012 at 21:26. -
- Reputation:
- Thread Starter
- Exalted and Worshipped Member
- Location: 12 werter
- Posts: 987
Re: Moment's questionAny ideas?
I cannot calculate the perpendicular distance from the line of action of the force to the point A.
I have tried calculating the lengths of the other lines that would add up using pythagoras theorem to obtain the perpendicular, but I can't find the necessary angles.Last edited by sulexk; 05-04-2012 at 21:37. -
- Reputation:
- Peer Of The TSR Realm
- Location: Hungary
- Posts: 1,561
Re: Moment's questionCalculate AC by the cosine rule. The angle AOC is 165. AO=OC=250(Original post by sulexk)
Any ideas?
I cannot calculate the perpendicular distance from the line of action of the force to the point A.
I have tried calculating the lengths of the other lines that would add up using pythagoras theorem to obtain the perpendicular, but I can't find the necessary angles.
The angle between AC and the force is 60 (75-15).
The perpendicular distance (d) d=AC*sin 60
Last edited by ztibor; 05-04-2012 at 22:13. -
- Reputation:
- Thread Starter
- Exalted and Worshipped Member
- Location: 12 werter
- Posts: 987
Re: Moment's questionThank you very much(Original post by ztibor)
Calculate AC by the cosine rule. The angle AOC is 165. AO=OC=250
The angle between AC and the force is 60 (75-15).
The perpendicular distance (d) d=AC*sin 60
