ksaimouli
  • ksaimouli
a compact disc has a radius of 6cm if the disc rotates about its central axis at a constant angular speed of 5 rev/s what is the total distance traveled by a point on the rim of the disc 40min
Physics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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ksaimouli
  • ksaimouli
when i did \[\omega=\frac{ \theta }{ t }\]
ksaimouli
  • ksaimouli
but why? (ur answer)
ksaimouli
  • ksaimouli
it did not work

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More answers

Shane_B
  • Shane_B
This question doesn't even require physics...it's purely mathematical: First, calculate the circumference of the circle. Then multiply that by 5 since it makes 5 revolutions per second. That will give you how far the dot traveled in 1 second. Then just multiply that times how many seconds are in 40 minutes.
ksaimouli
  • ksaimouli
Can u show me in physics way
Vincent-Lyon.Fr
  • Vincent-Lyon.Fr
\(\omega=\frac{ \theta }{ t }\) is ok. You should just be careful to plug in the values in the right units.
ksaimouli
  • ksaimouli
but @Vincent-Lyon.Fr i did not get the answer with this equation
Vincent-Lyon.Fr
  • Vincent-Lyon.Fr
Show us you numbers.
ksaimouli
  • ksaimouli
\[\theta=10\pi(2400)\]
Vincent-Lyon.Fr
  • Vincent-Lyon.Fr
What the question asks is the DISTANCE travelled, not the angle swept during that time.
ksaimouli
  • ksaimouli
Distance in rotation is nothing but the angle right?
Vincent-Lyon.Fr
  • Vincent-Lyon.Fr
No, distance is distance (in metres), and angle is angle (in radians).
ksaimouli
  • ksaimouli
so i found theta so can i use s=r theta
ksaimouli
  • ksaimouli
\[s=r \theta\]
Vincent-Lyon.Fr
  • Vincent-Lyon.Fr
Yep and you should find about 4.5 km

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