Find the forces exerted by the floor and the wall at Q and R?

  • Thread starter Thread starter devvaibhav
  • Start date Start date
  • Tags Tags
    Forces Wall
AI Thread Summary
The discussion revolves around calculating the forces exerted by the floor at point Q and the wall at point R for two steel balls inside a cylinder. The first participant has successfully calculated the force at Q as 750N but seeks assistance for the force at R. The conversation emphasizes the importance of drawing free body diagrams to visualize the forces involved, including normal forces and the interaction between the spheres. Participants highlight the need to determine the positions of contact points and the angles involved to resolve forces into components. The discussion underscores the necessity of employing equations derived from these diagrams to solve the problem effectively.
devvaibhav
Messages
22
Reaction score
0
1. Two steel balls A and B are placed inside a right circular cylinder, of diameter 54 cm making contacts at points P, Q and R as shown in the figure. The radius rA = 12 cm and rB = 18 cm. The masses are mA = 15 kg and mB = 60 kg. The forces exerted by the floor at the point Q and the wall at R are ____ and ____(taking g = 10 m/s

01-1.jpg



Homework Equations



Sorry, it has no relevant equation. The concept is to draw free body diagrams and solve it..

The Attempt at a Solution



I have solved the force exerted by the floor at the point Q i.e. 750N. Please assist me with the second part.

Sorry for the disfigured circle...
 
Physics news on Phys.org
Draw all forces. All are normal forces, normal to the walls or the ground, and those between the spheres are normal to the common tangent plane of the spheres and point toward the centres.

ehild
 
@ehild sorry but i was unable to do it..please give some more explanation...
 
the statement "it has no relevant equation" is nonsensical. What would you solve if you had no equations to sovle? As ehid said, DRAW THE FORCES and then you'll have some equations.

Seems like the first part of the problem is to find out where P is and then where the spheres touch.
 
I drew a new figure. All forces (drawn by arrows) are either horizontal or vertical, except the force of interaction between the spheres. You need the angle of the yellow right triangle to find the horizontal and vertical components of this force. Try to do something.


ehild
 

Attachments

  • spheres.JPG
    spheres.JPG
    10.6 KB · Views: 686

Thread 'Errors and significant figures'

I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
View full post »
Thread 'Collision of a bullet on a rod-string system: query'

Thread 'Collision of a bullet on a rod-string system: query'

In this question, I have a question. I am NOT trying to solve it, but it is just a conceptual question. Consider the point on the rod, which connects the string and the rod. My question: just before and after the collision, is ANGULAR momentum CONSERVED about this point? Lets call the point which connects the string and rod as P. Why am I asking this? : it is clear from the scenario that the point of concern, which connects the string and the rod, moves in a circular path due to the string...
View full post »
Thread 'A cylinder connected to a hanging mass'

Thread 'A cylinder connected to a hanging mass'

Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
View full post »

Similar threads

Verification of a ladder aginst a wall force
Replies
12
Views
1K
Estimate the pressure exerted on a floor
Replies
5
Views
4K
Calculating Horizontal Forces in a Stream of Sand Impacting a Wall
Replies
2
Views
8K
Skater's Force on Wall: Finding Average Force with Given Variables
Replies
9
Views
2K
The tension in the cord in this system
Replies
7
Views
2K
Calculate the gravitational force exerted on a 5.00 kg baby
Replies
2
Views
2K
Forces exerted on the ladder by the wall and ground
Replies
5
Views
7K
Solving Forces on Ladder: Wall & Floor
Replies
15
Views
3K
Mr. H Falls from the Top of a Climbing Wall
Replies
2
Views
1K
Find the force that the larger box exerts on the smaller box
Replies
3
Views
3K

Hot Threads

Recent Insights

Back
Top