Are these even possible? (Friction Related)

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The discussion revolves around calculating the coefficient of friction for an object sliding down an inclined plane at a 35-degree angle. The key equations provided are fk = µkFn and fsmax = µsFn, which relate frictional forces to the normal force. Participants express confusion about how to start solving the problem with limited variables. A hint is given regarding the normal force at the specified angle to guide the solution. The conversation also touches on determining maximum acceleration for a runner using shoes with a known coefficient of friction.
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Homework Statement


An object rests on an inclined plane. One end of the plane is lifted until the object begins to slide. The angle at which the object begins to slide is 35 degrees. What is the Coefficient of Friction

Homework Equations


fk = µkFn
fsmax=µsFn

The Attempt at a Solution


Honestly, I don't even know where to begin on this one. Only one variable is given, in what looks (to me) to be a problem where more than one variable is called for to be solved.
Similarly...

Homework Statement


Nike uses a sole for a line of shoes that has a coefficient of friction, µ=.3. Find the maximum acceleration that a runner using these shoes can have.
 
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Welcome to PF!

bassboy said:
An object rests on an inclined plane. One end of the plane is lifted until the object begins to slide. The angle at which the object begins to slide is 35 degrees. What is the Coefficient of Friction

Hi bassboy! Welcome to PF! :smile:

Hint: What is the normal force, Fn, when the angle is 35º? :wink:
Nike uses a sole for a line of shoes that has a coefficient of friction, µ=.3. Find the maximum acceleration that a runner using these shoes can have.

Show us what you've tried, and where you're stuck, and then we'll know how to help. :smile:
 

Thread 'Errors and significant figures'

I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
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Thread 'A cylinder connected to a hanging mass'

Thread 'A cylinder connected to a hanging mass'

Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
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