Did I make a mistake in my balance force equations for homework?

AI Thread Summary
The discussion revolves around calculating base reaction forces at points A and B using given parameters, including distances and an applied load. The user initially expresses concern about obtaining unrealistic answers from their balance equations. After reviewing their calculations, they realize they made a mistake and confirm that their revised approach is now correct. The thread concludes with a suggestion to mark the discussion as solved, indicating resolution of the issue. Overall, the user successfully navigates through their confusion to arrive at the correct solution.
rihitz
Messages
16
Reaction score
1

Homework Statement


IMG_20160929_152147.jpg

Given:
a=10m
l=18m
P=18kN
angle alpha = 35 deg

The task is to calculate the base reaction forces on A and on B

Homework Equations

The Attempt at a Solution


IMG_20160929_152431.jpg

This is my attempt on creating the balance equation system.[/B]
When replacing the variables with numbers, and trying to solve the equations, I get , in my opinion , unrealistic answers.

Is there any mistake this far?
 
Physics news on Phys.org
rihitz said:

Homework Statement


View attachment 106648
Given:
a=10m
l=18m
P=18kN
angle alpha = 35 deg

The task is to calculate the base reaction forces on A and on B

Homework Equations

The Attempt at a Solution


View attachment 106649
This is my attempt on creating the balance equation system.[/B]
When replacing the variables with numbers, and trying to solve the equations, I get , in my opinion , unrealistic answers.

Is there any mistake this far?
No.
 
Chestermiller said:
No.
IMG_20160929_154916.jpg
So this is correct as well?

I guess I found my mistake.
 
rihitz said:
View attachment 106651 So this is correct as well?

I guess I found my mistake.
Maybe you want to mark the thread Solved.
 

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

Force balance equations with moving base
Replies
1
Views
1K
Force equations: Force on ground by angled supports
Replies
21
Views
2K
Calculating Forces in a Leg: Gait Analysis and Joint Reaction Force
Replies
7
Views
1K
What mistake did I make in finding the reaction at hinge A?
Replies
3
Views
2K
Balancing Forces on a Scale: Man with Pulleys and Tensions
Replies
7
Views
2K
Why is the thrust equation same under gravitational force?
Replies
10
Views
2K
Balancing magnetic forces on rods
Replies
4
Views
1K
Friction - problem with one of the equilibrium equations
Replies
13
Views
2K
Terminal velocity of a skier using a Momentum Balance
Replies
1
Views
2K
What mistake did I make in finding the net force on a rotating disc?
Replies
1
Views
1K

Hot Threads

Recent Insights

Back
Top