- #1

sushmarao

- 1

- 0

## Homework Statement

#1

The drawing shows a baggage carousel at an airport. Your suitcase has not slid all the way down the slope and is going around at a constant speed on a circle (r = 14.0 m) as the carousel turns. The coefficient of static friction between the suitcase and the carousel is 0.860, and the angle θ in the drawing is 26.7 °. What is the minimum time required for your suitcase to go around once?

here is the picture that they included with the problem

http://edugen.wiley.com/edugen/cours...5/ch05p_26.gif

#2

A computer is reading data from a rotating CD-ROM. At a point that is 0.0144 m from the center of the disk, the centripetal acceleration is 155 m/s2. What is the centripetal acceleration at a point that is 0.0845 m from the center of the disc?

## Homework Equations

for #1 the equations I've been trying are

v= 2*pi*r/T

and acceleration centripetal = v^2/r

the same equation was used in #2.

the only other equations they taught us in lecture is F=mv^2/r

## The Attempt at a Solution

for problem 1 I did a free body diagram and came up with this equation:

(.86)(mg)(cos26.7) = mv^2/14

then the mass cancels

leaving (.86)(9.8)(cos26.7)=v^2/14

so then i solved for v

and then plugged v into

v=2*pi*14/T

and solved for T

but this is not the right answer and I'm totally confused as to what I'm doing wrong!

for #2

the only thing I can think of doing is solving for v^2 by doing

155 = v^2/.0144

and then plugging v^2 into

acceleration centripetal = v^2/.0845

what am I doing wrong? Please help!

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