# Recent content by imiuru

1. ### Determine the magnitude and direction of forces

"If A, B, C are pin connected, the system is a truss and members AB and BC are two force members which can only take tension or compression." A professor whom I asked yesterday made everything clear with the above sentence. Thank you SteamKing for all your help. I really appreciate that.
2. ### Determine the magnitude and direction of forces

Which part of my replies gave you, Sir, an impression that I throw up my hands? I am happy to know that. I spent like 10 hrs on this problem before I posted this thread. Anyway, have you solved the problem yourself, Sir? You mentioned "FAx + FCx = 0", and your analysis indicated that FAx and...
3. ### Determine the magnitude and direction of forces

Exactly. By using the first FBD, we have 4 unknowns and 3 equations. Thus, this problem is unsolvable, isn't it? As for the third FBD, which analyzes forces acting on Point B, I believe it is flawed because Fab may not act along line AB, and Fbc may not act along line BC. However, teachers...
4. ### Determine the magnitude and direction of forces

If AB is a rope, well,then I agree that only tension forces can exist thus the direction of force should be along AB.Since the question already mentioned that it is a beam, I suppose the structure can support shear force. Right? If so, why must the force be along AB? What are the subject and...
5. ### Determine the magnitude and direction of forces

Thanks SteamKing. It seems to me that you are saying point B is the system. Am I right? The FBD that you described should look like this: Yes, by using the above FBD, things become rather easy. In fact what you explained was similar to the explanation given by the textbook. You mentioned that...
6. ### Determine the magnitude and direction of forces

Yes, I wasn't given any information about how the frame is fixed to the wall. So I assumed it was fixed support that allows reactive moment. Anyway, I don't understand how we can analyze "the forces acting at a point". Is it true that when we analyze a problem in statics, we must first define...
7. ### Determine the magnitude and direction of forces

I apologize for my mistake. The force diagram should be like this: Thus, we have 6 unknowns and 3 equations. I deem it unsolvable.
8. ### Determine the magnitude and direction of forces

Homework Statement The figure shows a frame with a 100N object hanging on it. Determine the magnitude and direction of forces exerted on AB and BC respectively. Homework Equations ∑Fx=0, ∑Fy=0, ∑M=0 The Attempt at a Solution I believe this question is unsolvable. The free body...
9. ### Tangent problem

This is a typical question in analytic geometry. I believe the textbook must have covered it. There are at least 3 ways to solve it.
10. ### Help finding winning strategies in the following tile game?

I do understand the game from your description (at least 90%). However, I don't quite understand the question you are asking so I am just sharing my view on the game here. Let's say after first turn, the piece is not at the edge of the board, Player 1 will certainly win by issuing an order of...
11. ### Tension in cable and reaction force

Taking a moment with respect to point B should give you more simple equations. If you are doing scalar analysis, you should break your moment into Mx, My, Mz. Use M = r x F instead for vector analysis.
12. ### Work and Potential Energy: To the Moon physics problem

Wow..it must be a hard time for you. Have you learnt about electric field generated by an electric charge? It is analogous to the gravitational field. For example, you will find the equation for electrostatic force ##F=k\frac{Qq}{r^2}## very similar to the equation ##F=G\frac{Mm}{r^2}##. I...
13. ### Introductory Fluid Mechanics book.

Since you are looking for general reading, I recommend Fox and McDonald's Introduction to fluid mechanics by Philip J.Pritchard.
14. ### Banked curve

Thanks ehild for pointing out the keyword "banked" here. Yes, since it is a banked curve, the force involved are those 3 mentioned. In my previous post, I mistakenly mentioned "centrifugal force needed to maintain circular motion", it should be centripetal force.
15. ### Banked curve

Yes, the direction of the frictional force is opposite the other force, but the latter does not points to the centre of the circle. In fact it is a fictitious force, which arises due to the non-inertial frame of the object in circular motion. (Have you wonder why all motorcyclists bend inwards...