# Calculate angular velocity and angular acceleration of a rotating mass

1. May 15, 2013

### shandarama

I need to calculate the angular velocity of a 2kg mass rotating in a horizontal circle of 2m radius where 1 revolution takes 4 seconds

ω=v/r

My attempt was this : 4/360=.0111111×57.3=.636rs.

2. May 15, 2013

### tiny-tim

welcome to pf!

hi hshandarama! welcome to pf!
but you don't know the speed, v (it certainly isn't 4)

hint: angular velocity is radians per second

3. May 15, 2013

### shandarama

Yeah i'm on it. 1.57 radians per second. Thanks

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