A community for students.
Here's the question you clicked on:
 0 viewing
anonymous
 one year ago
A bridge whose total weight is 4400 N is 18.4 m long and supported at each end. Find the force exerted at the left end when a 1500 N tractor is located 9.8 m from the left end.
anonymous
 one year ago
A bridge whose total weight is 4400 N is 18.4 m long and supported at each end. Find the force exerted at the left end when a 1500 N tractor is located 9.8 m from the left end.

This Question is Open

ivancsc1996
 one year ago
Best ResponseYou've already chosen the best response.2dw:1437185904017:dw We must first analyse the forces acting on the bridge. 1) There is gravity which is pushing down on the bridge with a force of 4400N. 2) The bridge is carrying a tractor. Since gravity is pushing down on the tractor with a force of 1500N, the bridge must put a force of 1500N up on the wheels of the tractor to keep it at equilibrium. Therefore, through Newton's law of action and reaction, the tractor is puching down on the bridge with a force of 1500N. 3) The left and the right supports are exerting the force \(N\) and \(n\) up on the bridge respectively. Now, if we take torques around the right support of the bridge (a choice which eliminates torques made by the right support), we have \[4400N\frac{18.4m}{2}+1500N9.8mN18.4m=0\] Solving for \(N\) (do not confuse the force \(N\) in the term \(N18.4m\) with the units of newtons \(N\) in the rest of the equation) \[N=\frac{4400N\frac{18.4m}{2}+1500N9.8m}{18.4m}\]
Ask your own question
Sign UpFind more explanations on OpenStudy
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.