Asked by Karlee
A coin is placed 17.0 from the axis of a rotating turntable of variable speed. When the speed of the turntable is slowly increased, the coin remains fixed on the turntable until a rate of 33 is reached and the coin slides off.What is the coefficient of static friction between the coin and the turntable?
Answers
Answered by
bobpursley
forcefriction=forcecentripetal
mu*mg=m*v^2/r
At this point, I don't know what your 33 is? m/s? rpm?
mu*mg=m*v^2/r
At this point, I don't know what your 33 is? m/s? rpm?
Answered by
Karlee
oops sorry, 33 rpm and 17 cm
Answered by
kevin
I have a very similar problem due on mastering physics in an hour.. I came here to get help but now 30 minutes later I'm actually going to be giving help :). Hopefully it wont be too late depending on your time zone.
u= coefficient of static friction
force of friction = u*mg
IM NOT THAT SMART SO THIS MIGHT BE WRONG BUT HOPEFULLY IT WILL HELP.. I ALSO SUCK AT SIG FIGS SO ITS PROBABLY SLIGHTLY OFF.
set force of friction = to centripetal force
so u*m*g = m*v^2/r
m cancels
so u*g = v^2/r.
r = 17cm = .17m
the circumference of the circle = 2pi*r
which roughly = 1.068m (only 2 sig figs tho)
convert 33 rpm to rps to get .55 rps.
so the object move .55 rotations in one second so it moves .55*1.068m in one second. so it moves .5874m/s reduce this to 2 sig figs to get .59m/s
use the equation we formed earlier :
u*g = v^2/r.
u= v^2/rg
u= (.59m/s)^2/((.17m)(9.80m/s^2))
u=.21
u= coefficient of static friction
force of friction = u*mg
IM NOT THAT SMART SO THIS MIGHT BE WRONG BUT HOPEFULLY IT WILL HELP.. I ALSO SUCK AT SIG FIGS SO ITS PROBABLY SLIGHTLY OFF.
set force of friction = to centripetal force
so u*m*g = m*v^2/r
m cancels
so u*g = v^2/r.
r = 17cm = .17m
the circumference of the circle = 2pi*r
which roughly = 1.068m (only 2 sig figs tho)
convert 33 rpm to rps to get .55 rps.
so the object move .55 rotations in one second so it moves .55*1.068m in one second. so it moves .5874m/s reduce this to 2 sig figs to get .59m/s
use the equation we formed earlier :
u*g = v^2/r.
u= v^2/rg
u= (.59m/s)^2/((.17m)(9.80m/s^2))
u=.21
Answered by
Anonymous
THANK YOU!!!!!!!
Answered by
Guythatcan'tdophysics3yearsinthefuture
TY! TY!
There are no AI answers yet. The ability to request AI answers is coming soon!
Submit Your Answer
We prioritize human answers over AI answers.
If you are human, and you can answer this question, please submit your answer.