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anonymous
 one year ago
Medal award!
Can someone help me?
If this circle (disc) spins 20 revolutions per minute, what is the angular speed?
what would the linear speed be at point p in m/s?
anonymous
 one year ago
Medal award! Can someone help me? If this circle (disc) spins 20 revolutions per minute, what is the angular speed? what would the linear speed be at point p in m/s?

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anonymous
 one year ago
Best ResponseYou've already chosen the best response.0how do you set it up?

Curry
 one year ago
Best ResponseYou've already chosen the best response.1well for linear speed, it is [circumference times 20] divided by 60

Curry
 one year ago
Best ResponseYou've already chosen the best response.1so, wait soryr. i calcualted wrong units.

Curry
 one year ago
Best ResponseYou've already chosen the best response.1it'd be 10.47 for linear speed.

Curry
 one year ago
Best ResponseYou've already chosen the best response.1and angular speed is linear speed/r is one formula for angular speed.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0i'm not sure how to figure out the circumference :/

Curry
 one year ago
Best ResponseYou've already chosen the best response.1angular speed = 2pi(frequency) = 2pi / (period) = linear speed / radius.

Curry
 one year ago
Best ResponseYou've already chosen the best response.1area of circle is (pi)r^2. circumference is 2pi(r).

Curry
 one year ago
Best ResponseYou've already chosen the best response.1wait, sorry, legit confused here, why are they teaching you revolutions and such without teaching how to find circumference/

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0no i'm just confused about how the circumference is applied here..

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0because all that is know is the radius and the 40 degrees

Curry
 one year ago
Best ResponseYou've already chosen the best response.1well, think of it like a wheel rolling. if a wheel rolls 20 times, how would you figure out how far it has rolled? Well, the way to think about it is, what if you took a belt, and made it into a circle with radius 5? now, straigten the belt. now take 20 belt lengths. that's what i'm doing here.

Curry
 one year ago
Best ResponseYou've already chosen the best response.1if a wheel rolls once, the distance it covers on the ground is 1 circumference. get it?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0in terms of figuring out the angular and linear speeds how would I apply this rule?

Curry
 one year ago
Best ResponseYou've already chosen the best response.1well for linear speed, it's the same as finding speed of a car. total distance divided by total time. so 20 revoltuions divided by 60 seconds.

Curry
 one year ago
Best ResponseYou've already chosen the best response.1and if you scroll up, you'll see teh three equations i posted that you can use to find angular speed.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0oh ok thanks so much I just got confused because when I divided 20/60 I got .333 repeating and not 10.47

Curry
 one year ago
Best ResponseYou've already chosen the best response.1glad you figured it out.
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