Rotational Kinematics Problem Interpretation

AI Thread Summary
The discussion revolves around interpreting a rotational kinematics problem related to a car's braking. The initial scenario involves the wheels locking after 2.0 revolutions when the brakes are applied. The key question is how many revolutions occur if the initial speed is doubled, while maintaining constant acceleration. Participants emphasize the importance of understanding the relationship between initial speed and the number of revolutions before stopping. Writing out the problem helps clarify the connection between these elements, leading to a better grasp of the solution.
yougene
Messages
35
Reaction score
0

Homework Statement


If you step on your car's brakes hard, the wheels stop turning (i.e., the wheels "lock") after 2.0 revolution.


Part A.
At the same constant acceleration, how many revolutions do the wheels make before stopping if your initial speed is twice as high?


Homework Equations


Rotational Kinematics
Omega
Alpha
etc...


The Attempt at a Solution


I need help interpreting the problem not doing it.



Ok, the first part says it took 2 revolutions to startup.
The actual question is asking me how many revolutions are made though. How are these two parts related?
 
Physics news on Phys.org
Figured it out. It's amazing how writing things out always puts it in perspective.
 
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 .
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...
Back
Top