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2.1 = angular speed.

37.7 linear speed.

how do you set it up?

well for linear speed, it is [circumference times 20] divided by 60

so, wait soryr. i calcualted wrong units.

it'd be 10.47 for linear speed.

and angular speed is linear speed/r is one formula for angular speed.

i'm not sure how to figure out the circumference :/

angular speed = 2pi(frequency) = 2pi / (period) = linear speed / radius.

area of circle is (pi)r^2. circumference is 2pi(r).

no i'm just confused about how the circumference is applied here..

because all that is know is the radius and the 40 degrees

if a wheel rolls once, the distance it covers on the ground is 1 circumference. get it?

oh ok :) thanks

in terms of figuring out the angular and linear speeds how would I apply this rule?

glad you figured it out.