What is the acceleration of the crate

  • Thread starter Thread starter Physicspilot
  • Start date Start date
  • Tags Tags
    Acceleration
Physicspilot
Messages
4
Reaction score
0

Homework Statement


A 100 kg crate is carefully placed with zero velocity on the incline. What is the
acceleration of the crate if theta= 40degrees? μk=0.25 and μs=0.35(between the box and the incline.


Homework Equations





The Attempt at a Solution


My assumption is that,the (coefficient of)static friction will have no effect because we are looking at when the box starts sliding down the incline .Having that in mind,

i came up with: ∑F=m*a:
μk-Fg*sin40=m*a
245-630=100*a
a=-3.84 *******but this is wrong. Thanks in advance
 
Physics news on Phys.org
Resolved by moi.I forgot to multiply the friction by cos40:smile:
 

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

Static friction coefficient for a crate in the back of a truck
Replies
6
Views
2K
What is the acceleration of the upper crate when the top crate begins to slide?
Replies
10
Views
4K
Acceleration with two wooden crates
Replies
4
Views
15K
Direction of a rope with a ball inside an accelerating box
Replies
5
Views
2K
Maximum Acceleration of sliding crates
Replies
6
Views
2K
What Is the Coefficient of Kinetic Friction Between the Ramp and the Crate?
Replies
6
Views
2K
Crate pushed up an inclined plane
Replies
6
Views
6K
How do I properly set up this F.B.D.?
Replies
1
Views
1K
Finding the Angle When the Crate Begins to Slip
Replies
6
Views
3K
Friction Problem of a Crate Sliding Down a Ramp
Replies
4
Views
3K

Hot Threads

Recent Insights

Back
Top