Find tension force of a cable and components of reaction force of pivot

AI Thread Summary
The discussion revolves around finding the tension force in a cable and the components of the reaction force at a pivot. The original poster struggles with drawing diagrams and applying the correct formulas, particularly torque, to solve the problem. They express confusion about using torque without knowing the distance and seek guidance on diagramming the forces involved. Respondents suggest labeling all forces and angles clearly on the diagram and emphasize the importance of using torque in the calculations. The conversation highlights the need for clarity in problem-solving and diagramming for better understanding.
kurispice
Messages
5
Reaction score
0

Homework Statement



Please see attached photos. I've been drawing and re-drawing diagrams but I'm at a loss. For part a, I've tried a right triangle using the top cable as the hypotenuse. I've tried the force equation (ƩF=ma) but I don't think that's right. I just can't get a start.


Homework Equations



See attached photo with help describing situation. Note also the angle ∅ has been changed from the book's problem from 65 to 55 degrees.

The Attempt at a Solution



I've started a diagram but I do not know what formulas to use for the math.
If you could walk me through the problem that would be great! I have an exam coming up in two days and have no other help in between.
 

Attachments

  • IMAG0354.jpg
    IMAG0354.jpg
    21.3 KB · Views: 639
  • IMAG0355-1.jpg
    IMAG0355-1.jpg
    14.5 KB · Views: 579
  • IMAG0356-1.jpg
    IMAG0356-1.jpg
    16.8 KB · Views: 656
Physics news on Phys.org
You need to use torque to find the tension in the wire, none of your work or what you mentioned seems to point to using torque.
 
How do I use torque without knowing the distance in this formula? torque=F times distance
Also, how do I draw a diagram for each part of the problem?
 
Use \ell in your formulas, since they don't give you a length most likely it will drop out.


For a diagram, draw the rod and label all forces on it, with the angles included. They more or less gave you a diagram, so all that's left to do it label the forces and angles more clearly.
 
Okay, thanks so much!
I'll try that now.
 

Thread 'Struggling to understand the concept of this question (ice cube in water optics question)'

TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
View full post »
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
View full post »

Similar threads

Maximum tension in a cable holding a drawbridge
Replies
5
Views
2K
Equilibrium : normal reaction of a rotational center?
Replies
2
Views
1K
Force pulling on a string at an angle with a block at the other end
Replies
2
Views
1K
Find the tension in the cable and reactive forces at ground
Replies
4
Views
5K
Tension Question for Ship Container and Wind Gust
Replies
12
Views
962
Calculating Forces in a Leg: Gait Analysis and Joint Reaction Force
Replies
7
Views
1K
Finding tension force and and components of a uniform boom
Replies
1
Views
4K
Tension and net torque in a cable
Replies
10
Views
5K
Find the tension in the cable and the force the ramp exerts on the tires
Replies
8
Views
5K
Force on a rod attached to a pivot.
Replies
2
Views
3K

Hot Threads

Recent Insights

Back
Top