Finding Equilibrium: Tips for Solving Static Problems

AI Thread Summary
To solve the static problem, it is crucial to correctly identify the center of mass (CoM) and its position relative to the fulcrum. The approach of using net torque equations is correct, but the calculations must clearly show the assumptions made about the CoM's position. Setting up two equations with the unknowns for the CoM position and mass will help in finding the solution. The final answer should be verified against the problem's requirements to ensure accuracy. Clear calculations and assumptions are essential for resolving the issue effectively.
krypt0nite
Messages
31
Reaction score
0
How do I do this problem? How do I start?
Problem
I drew all the Forces acting on the body and used Net Torque=0. I still can't find the right answer. So far none of my answers are close. I think my approach is wrong. Can someone give me any hints to help me solve it.
 
Physics news on Phys.org
What you've done is essentially correct, but unless you show your calculations, there's no way we can tell you where you made the mistake.
 
Net Torque CCW = Net Torque CW
Mg(3m) = 470.4N(6m) I used the wheel as the fulcrum point.
Mg= 940.8N
 
You do not know that the center of mass of the boat is at 3m.

You must assume the position of the CoM as some distance x (from the wheel) in the first case, and x - 0.15 in the second case. Write both equations, with the two unknowns (x and M), and solve for them from the equations.
 
and the answer is A=440kg right?
thx
 
H.C, how u get the question from the test#?$#?@$?#@
 

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

Static equilibrium | Uniform sphere on incline | Determining friction
Replies
43
Views
2K
Trouble with Static Equilibrium
Replies
5
Views
2K
Why Does Torque Equilibrium Not Solve for Fcy in Static Equilibrium Problems?
Replies
9
Views
4K
Why Is Taking Moments at Point A' Incorrect in Rotational Balance Problems?
Replies
14
Views
2K
Virtual Work and Static Equilibrium
Replies
3
Views
2K
Solving Equilibrium w/ Plank & Forces | Physics Problem
Replies
7
Views
4K
Spring static equilibrium Problem
2
Replies
57
Views
6K
How to find the equilibrium position of three masses (two of them fixed)?
Replies
4
Views
2K
Find the stretch of a steel wire in a static equilibrium problem.
Replies
1
Views
1K
Static Equilibrium Problem involving Moments
Replies
4
Views
4K

Hot Threads

Recent Insights

Back
Top