Acd has diameter of 120 millimeters. when playing audio, the angular speed varies to keep the linear speed constant where the disc is being read. when reading along the outer edge of the disc, the angular speed is about 206 rpm (revolutions per minute). find the linear speed in meters/second. (round your answer to three decimal places.)

we are given

A cd has diameter of 120 millimeters

so, d=120mm

so, firstly, we will find radius

we can plug it

we know that

1mm=0.001m

so, we get

the angular speed is about 206 rpm

we know that

1 revolution =2pi radians

so, we get

now, we can change it into seconds

1 min =60 seconds

so, we get

now, we can find linear speed(v)

we can use formula

v=w*r

so, we can plug values

and we get

so, linear speed is 1.257 m/sec............Answer

i'm assuming it's looking for the missing length, which should be 4cm

hope this !

step-by-step explanation:

given that there are two triangles j'k'l' and jkl>

the former is got by dilating the second one.

when drawn on a grid, (graph paper) coordinates of vertices of first triangle is

(6,12)j, (9,6)k and (12,9)l

side jk has length = distance between j and k

=

side j'k'=distance between j' and k'

=

ie j'k'l' has sides 1/3 of that of corresponding sides of jkl.

hence scale factor of 1/3 is used to get j'k'l'from jkl