What Are the Tension Forces in Suspended Structures?

[cary1234]

Homework Statement

Please help me to draw free body diagrams of the following.

1.Find the tension T in each cable and the magnitude and direction of the force exerted on the strut by the pivot in each of the arrangements in fig. 11.23 in each case let w be the weight of the suspended crate full of priceless art objects. The strut is uniform and also has weight w.

this is fig. 11.23

http://img191.imageshack.us/img191/2811/physicsforum.th.png


2. The horizontal beam in fig. 11.24 weight 50N. and its center of gravity is at its center.
find

a.The tension in the cable
b.The horizontal and vertical components of the force exerted on the beam at the wall.

this is fig. 11.24

http://img6.imageshack.us/img6/6100/physicsquestion2.th.png


3. A 3.00 m long, 240-N uniform rod at the zoo is held in a horizontal position by two ropes at its end(fig. 11.26) The left ropes make an angle of 150 deg. with the rod and the right rope makes an angle θ with the horizontal. A 90-N howler monkey hangs motionless 0.50 m from the right end of the rod as he carefully studies you. Calculate the tensions in the two ropes and the angle θ

this is fig. 11.26

http://img40.imageshack.us/img40/6250/question3f.th.png

The Attempt at a Solution

in question number 1. here's the free body diagram.

http://img9.imageshack.us/img9/6702/question1attempt.th.png


in question # 2 here's the free body diagram.

http://img27.imageshack.us/img27/5323/question2attemt.th.png


in question number 3. i don't have any idea...



please try to draw the right free body diagram..
after i know the right free body diagram i will start to work in computation or equations..

 

[cary1234]

i try to solve question number2 and my answer is.

-T1 = 75
T2=60

is it correct?

 

[cary1234]

how sad.. :( no ones helping me..