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Angular Acceleration problem

  • Thread starter BrainMan
  • Start date
279
2
1. Homework Statement
A turntable moves from rest to an angular speed of 45 rev/min in 1.5 s. What is its average angular acceleration?


2. Homework Equations
ω = ωo + [itex]\alpha[/itex]t


3. The Attempt at a Solution
I first converted 45 to radians by multiplying it by pi
45(3.14152654)/180 = .79 rad
then I plugged it into the above equation
.79 = α(1.5)
α = .53 r/s2
The actual answer is pi r/s2
 

Nathanael

Homework Helper
1,650
238
Your conversion is where the problem is. You want to convert from rev/min to rad/sec

First let's convert from rev/min to rad/min:

How many radians are in 1 revolution?
 
279
2
Your conversion is where the problem is. You want to convert from rev/min to rad/sec

First let's convert from rev/min to rad/min:

How many radians are in 1 revolution?
2 pi
 

Nathanael

Homework Helper
1,650
238

Nathanael

Homework Helper
1,650
238
I first converted 45 to radians by multiplying it by pi
45(3.14152654)/180 = .79 rad
That is how you convert 45 DEGREES into radians. But the number 45 has units of REVOLUTIONS, not degrees.
 

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