Answer:
Step-by-step explanation:
45
we are given
A cd has diameter of 120 millimeters
so, d=120mm
so, firstly, we will find radius
![r=\frac{d}{2}](https://tex.z-dn.net/?f=r%3D%5Cfrac%7Bd%7D%7B2%7D)
we can plug it
![r=\frac{120}{2}mm](https://tex.z-dn.net/?f=r%3D%5Cfrac%7B120%7D%7B2%7Dmm)
![r=60mm](https://tex.z-dn.net/?f=r%3D60mm)
we know that
1mm=0.001m
so, we get
![r=60*0.001m](https://tex.z-dn.net/?f=r%3D60%2A0.001m)
![r=0.06m](https://tex.z-dn.net/?f=r%3D0.06m)
the angular speed is about 206 rpm
we know that
1 revolution =2pi radians
so, we get
![w=200*2\pi rad/min](https://tex.z-dn.net/?f=w%3D200%2A2%5Cpi%20rad%2Fmin)
now, we can change it into seconds
1 min =60 seconds
so, we get
![w=200*2\pi *\frac{1}{60} rad/sec](https://tex.z-dn.net/?f=w%3D200%2A2%5Cpi%20%2A%5Cfrac%7B1%7D%7B60%7D%20rad%2Fsec)
![w=20.94395 rad/sec](https://tex.z-dn.net/?f=w%3D20.94395%20rad%2Fsec)
now, we can find linear speed(v)
we can use formula
v=w*r
so, we can plug values
and we get
![v=20.94395*0.06 m/sec](https://tex.z-dn.net/?f=v%3D20.94395%2A0.06%20m%2Fsec)
![v=1.256637 m/sec](https://tex.z-dn.net/?f=v%3D1.256637%20m%2Fsec)
so, linear speed is 1.257 m/sec............Answer
Part A) 70 and then 700
Part B) 10
My method of learning my time's tables was by printing out the sheets and working every day. Until they just come to you Like flys come to food.
360° - 90° - 26° = 244°
244° ÷ 2 = 122°