Question

how to draw 210 degree with protector
​

Answer 1

Answer:

Answer:

Angular retardation of flywheel = π/10  rad/s²

Explanation:

Given:-

Initial angular velocity of flywheel = 360 rpm

Final angular velocity of flywheel = 180 rpm

Time taken for change in angular velocity = 1 min = 60 sec

To find:-

Angular acceleration (retardation) of the flywheel, a =?

Formula required:-

Formula for angular acceleration

        a = Δω / Δt

[ where a is angular acceleration, Δω is change in angular velocity, Δt is change in time ]

Solution:-

Converting the angular velocities given in rpm into rad/sec

→ ω₁ = 360 rpm = 360 × 2π/60  rad/sec = 12π rad/sec

→ ω₂ = 180 rpm = 180 × 2π/60  rad/sec = 6π rad/sec

Calculating the angular acceleration

→ a = Δω / Δt

→ a = (12π - 6π) / (60)

→ a = -6π / 60

→ a = -π/10  rad/s²

Therefore,

Angular retardation of the flywheel is π/10  rad/s².

Answer 2

by using a compass, you you just need to draw a straight line as first... then construct 60 degree angle on any point of line.. then construct a bisector on the 60 degree angle,you will get 30 degree and then the bisect of it will be the the main line of 210 degree... just try and position your drawing, finding the angle that looks >180 degree... hope it's helps