Disk on a Motion: Find the Coordinates of Point A at t= 4piR/v

  • Thread starter Thread starter BBAI BBAI
  • Start date Start date
  • Tags Tags
    Disk Motion
AI Thread Summary
To find the coordinates of Point A on a disk after a specified time, the initial conditions include a radius R, an initial velocity v in the positive x-direction, and an angular velocity ω equal to v/2R. The motion of Point A can be expressed as a function of the center's velocity and ω. The discussion emphasizes the need to relate the motion of Point A to these variables for accurate calculations. Participants suggest starting with ω to simplify the problem. The goal is to derive the correct coordinates of Point A at t = 4piR/v.
BBAI BBAI
Messages
18
Reaction score
0

Homework Statement



Adisk of radius R centred at the origin is placed on a frictionless x-y plane with origin as the centre of the disk.At t=0, the disk is given initial motion such that the point A(R,0) has velocity v towards
+ve x-axis and ω=v/2R. Find the coordinates of Point A at t= 4piR/v

Homework Equations



∅=ωt..That's all i think is needed

The Attempt at a Solution


i used but i am getting a wrong answer help!
 
Physics news on Phys.org
Can you express the motion of A as functtion of the velocity of the center and ω?
Based on that, can you calculate this velocity and ω?
 
That's the problem..The velocity of A at t=0 is given..How can i relate to the centre of mass velocity..
 
I proposed to start with the other direction (use w,ω for the center and calculate the motion of A as function of those variables) for a good reason - it is easier.
Did you try to calculate it?
 
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...
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...
Back
Top