Question

The 25-kg bar has a center of mass at G. If it is supported by a smooth peg at C, a roller at A, and cord at AB, determine the reactions at these supports.

Answer 1

@TuringTest Are you familiar with Equilibrium of a Rigid Body problems?

Answer 2

This is a statics question isn't it

Answer 3

Yes it is.

Answer 4

I can give it a try, but I am taking the course as well so it might not be correct haha

Answer 5

Haha alright. @agent0smith would you be able to help us with this?

Answer 6

LOL! You and I have the exact same book, I have it as one of the fundamental problems in chapter 5

Answer 7

:P Yeah! Question F5-5.

Answer 8

Doesn't your book have the solutions to the fundamental problems in the back of the book?

Answer 9

If not I can send you the picture for it....it doesn't explain it fully, but it gives you a better hint to it on what they found for the forces in the x, y directions and the moment about point A

Answer 10

Looking at it though, I am pretty sure I understand how the free body diagram looks like, however

Answer 11

Okay, I found it. It was in the middle of my book because mines a combination of Statics and Dynamics. That's the answer, but I could still use some explanations on what they did.

Answer 12

Alright well let me see if I can explain it (this is perfect by the way because I have an exam on this this week one chapters 1 through 6 so it is good practice)

Answer 13

Alright I got the sum of all the forces in the x direction correct if you want some explanation on that

Answer 14

Okay!

Answer 15

Alright so looking at the picture we can see that we have 2 things that are in the x direction.....the tension and the normal of the peg

Answer 16

Or in other words the normal of the bar on the peg

Answer 17

The tension of the rope will be the Tcos(15)

The normal of the bar on the peg will be (N_c)cos60

Thus our equation for the x direction is Tcos(15) - (N_c)cos60 = 0

Answer 18

I see the tension, I don't understand the second part. What does the normal of the bar mean? Where does the 60 come from?

Answer 19

From what I understand, the bar is being supported by the peg or in other words, the peg is sticking into the opening of the bar kind of like a smooth rod and the bar is resting on it.

Answer 20

The normal of the bar on the peg just means that.....well let me draw a picture