A ball on a carpet, while we pull it

  • Thread starter Thread starter Cuzo
  • Start date Start date
  • Tags Tags
    Ball Pull
Cuzo
Messages
1
Reaction score
0

Homework Statement


I have a problem. Imagine there is a ball on a carpet, I start to pull the carpet. The mass of the ball is 7 kilograms and the acceleration of the whole thing is 2m/s^2. What is the force with which I am pulling the carpet. Also what is the acceleration of the center of gravity (it is different as the ball is only rolling and not sliding on the carpet).
Thank you for answering.

http://www.shrani.si/f/3N/mM/4CG1g2q2/neimenovana.jpg

Homework Equations


F=ma2
Jar=Fr

The Attempt at a Solution


I came up with F=14 N and a=1,4ms2 but am very unsure of the results.
 
Last edited by a moderator:
Physics news on Phys.org
Why should the the two accelerations different? Is the radius of the ball not supplied?
 

Thread 'Initial conditions for orbits around a wormhole'

Hi, I had an exam and I completely messed up a problem. Especially one part which was necessary for the rest of the problem. Basically, I have a wormhole metric: $$(ds)^2 = -(dt)^2 + (dr)^2 + (r^2 + b^2)( (d\theta)^2 + sin^2 \theta (d\phi)^2 )$$ Where ##b=1## with an orbit only in the equatorial plane. We also know from the question that the orbit must satisfy this relationship: $$\varepsilon = \frac{1}{2} (\frac{dr}{d\tau})^2 + V_{eff}(r)$$ Ultimately, I was tasked to find the initial...
View full post »

Thread 'Help to convert units of a simple formula'

The value of H equals ## 10^{3}## in natural units, According to : https://en.wikipedia.org/wiki/Natural_units, ## t \sim 10^{-21} sec = 10^{21} Hz ##, and since ## \text{GeV} \sim 10^{24} \text{Hz } ##, ## GeV \sim 10^{24} \times 10^{-21} = 10^3 ## in natural units. So is this conversion correct? Also in the above formula, can I convert H to that natural units , since it’s a constant, while keeping k in Hz ?
View full post »

Similar threads

(Magnetism) Magnetic pull force on a steel ball
Replies
4
Views
2K
Calculate Magnetic Pull Force for Steel Ball
Replies
2
Views
3K
A ball climbing a ramp while "rolling the wrong way"
Replies
32
Views
3K
B Rolling Without Slipping on an Inclined Plane
Replies
5
Views
2K
How does ball A come to rest and Ball B remain stationary?
Replies
2
Views
1K
Relative Velocity of Ball on Moving Board
Replies
3
Views
2K
Ball rolls without slipping in an accelerating car
Replies
6
Views
3K
Calculating Theoretical Reaction Force of Ball Traveling in Semi-Circle
Replies
43
Views
4K
I [Questions] Modeling a Baseball Pitch Trajectory in 3D Space
Replies
1
Views
2K
Rolling without slipping problem
Replies
42
Views
3K

Hot Threads

Recent Insights

Back
Top