Approximate K and 'u' values| HELP

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The discussion revolves around calculating the coefficient of friction and spring constant for a wooden block and springs. Participants inquire about the approximate values for kinetic and static friction, suggesting a value of 0.6 for the friction between a steel ball and a wooden ramp. For the spring constant, it is clarified that when two springs are in parallel, their k values should be added to find the total k value. There is also a question about the need for equations to determine the spring constant based on dimensions. The conversation emphasizes the importance of understanding the mechanics involved in these calculations.
dekoi
Coefficient of Friction and Spring constant

What would the approximate value of (kinetic, and if possible, static) friction be for a block of wood of this nature:
\\Attachment 1 and 2

And how about the 'k' value for these springs? How would i go about calculating this sort of problem when the two springs are attached to a board which is the place of impact? Would i double the value of k?

\\Attachment 3
 

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Awaiting for the image to be approved Dekoi. "Dekoi" is of French origin I pressumed.
 
Does a value of 0.6 sound correct for the coefficient of friction between a steel ball and a wooden-ramp shown above?
 
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2 springs in parallel: add the k values to find the total k value.

Not sure what you're doing here. Do you need equations to determine spring constant from spring dimensions?
 

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 .
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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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