Equilibrim Physics Problems – Solve Now!

  • Thread starter Thread starter gnarrr
  • Start date Start date
AI Thread Summary
To achieve rotational equilibrium with a downward force of 40.5 N, the distance from point 'A' must be calculated using the equation T1 = T2 and F = 0. The initial attempt at solving the problem included incorrect calculations, leading to a distance of 6.18 m. It is essential to consider both clockwise and counterclockwise moments when calculating moments about the fulcrum. Proper sign conventions must be applied to ensure accurate results. The discussion emphasizes the importance of showing work and relevant equations when seeking help with physics problems.
gnarrr
Messages
5
Reaction score
0
http://img27.imageshack.us/img27/8011/physicsproblems.png
 
Last edited by a moderator:
Physics news on Phys.org
Hi gnarrr, welcome to PF.
Please go through the rules of the PF.
Don't post the problems alone. Show your attempts. List the relevant equations. Still if you don't get, we will help you.
 
The first one

Homework Statement



Consider the bar to have negligible mass. How far from point 'A' must a downward force of 40.5 N be applied in order to achieve rotational equilibrium.

Homework Equations


T1=T2
F=0

The Attempt at a Solution



5x9.8x2.1 + 3.5x9.8x4.3 + 40.5xd = 0
d=6.18m
 
i figured out the second one
 
First on is wrong.
If you want to take the moment about the fulcrum, you have to consider clockwise and counterclockwise moments and use proper sings.
If you want to take the moments about A, 40.5 N and 3.5 kg produce clockwise moment and the reaction due to all the forces on the fulcrum will produce the counterclockwise moment. Equate them to get d.
 

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 'Rolling without slipping on a curved surface'

Kindly see the attached pdf. My attempt to solve it, is in it. I'm wondering if my solution is right. My idea is this: At any point of time, the ball may be assumed to be at an incline which is at an angle of θ(kindly see both the pics in the pdf file). The value of θ will continuously change and so will the value of friction. I'm not able to figure out, why my solution is wrong, if it is wrong .
View full post »

Similar threads

How Do You Draw a Physics Displacement-Time Graph?
Replies
1
Views
1K
2 blocks, each on an inclined plane
Replies
5
Views
3K
Why is the 10 μF capacitor causing extreme confusion?
Replies
2
Views
1K
Tension from Incline Plane: Only Measured in Horizontal Direction?
Replies
3
Views
3K
Find Thevenin Equivalent Resistance for Network
Replies
3
Views
3K
Solving Momentum and Energy Equations for Elastic Collision | Help Needed
Replies
13
Views
3K
Basic electronics problem with an amplification factor for a transistor
Replies
25
Views
9K
3 identical resistorsgive the equivalent resistance of the circuit?
Replies
1
Views
2K
What Are the Tension Forces in Suspended Structures?
Replies
2
Views
17K
[HELP] Confused about EMF induced in rotating coil
Replies
9
Views
15K

Hot Threads

Recent Insights

Back
Top