Time required to reach to Speed of Roller table for a bar

AI Thread Summary
The discussion focuses on calculating the time required for a bar to accelerate from 10 meters per second to 20 meters per second on a roller table after being cut. The roller table's initial speed is 20 meters per second, while the bar initially moves at 10 meters per second and slips due to friction. The coefficient of friction is specified as 0.5, which is crucial for determining the acceleration of the bar. Participants are encouraged to share their attempts and challenges in formulating the friction factor affecting the bar's speed. Understanding the relationship between mass, acceleration, and friction is essential for solving the problem.
Kaustubh
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Homework Statement



If rolling mill is running at 10 meters per second and roller table after mill is running at 20 meters per second.
Before cutting of bar, it will move at 10 meters per second.

Before cutting, roller table is trying to pull the bar, but since bar is not cut, it will slip on roller.

After cutting, bar has to move with the speed of 20 meters per second on roller table.
How much time bar will take to reach to that speed?

Coiff of friction of roller is 0.5

Homework Equations



F = Mass x a.
Coiff of friction x g = a
 
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Welcome to PF!

Hi Kaustubh! Welcome to PF! :wink:

Show us what you've tried, and where you're stuck, and then we'll know how to help! :smile:
 
Hi there,
I am unable to formulate the friction factor, which will affect speed of bar after cutting.
 
I don't understand …

the coefficient of friction is given as 0.5 :confused:
 

Thread 'Rolling without slipping on a curved surface'

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 .
View full post »

Thread 'Struggling to understand the concept of this question (ice cube in water optics question)'

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...
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