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December 19, 2014

December 19, 2014

Posted by **engmath** on Monday, February 22, 2010 at 9:52pm.

I thought the answer was 0.5449 but its wrong. no matter what I do i keep getting the same answer!

- Physics -
**bobpursley**, Monday, February 22, 2010 at 11:24pmWhy would you think the answer is .5446? I will be happy to critique your work

- Physics -
**bobpursley**, Monday, February 22, 2010 at 11:27pmyou need to round off to three sig digits

- Physics -
**engmath**, Tuesday, February 23, 2010 at 12:15amα=a/r

the time it takes to travel π/2 radians is

related by

π/2=.5*a*t^2/r

solve for t

t=sqrt(π*r/a)

ω=α*t

Plug in t and a/r

ω=sqrt(a*π/r)

The force is m*ω^2*r

F=m*a*π

friction is

m*g*µs

then

m*g*µs=m*a*π

so basically....

µs=a*π/g

=1.70pi/9.8= 0.54497 ====> sig figs 0.545

- Physics -
**engmath**, Tuesday, February 23, 2010 at 12:16amand that answer comes up as incorrect...

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