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An ultracentrifuge acelerates from rest up to 90000 rpm in 1.9 minutes.
A) what is it angular acceleration in rad/s^2?
B) what is the tangencial acceleration of a point of 8.20 como from the axis of rotation?
C) what is the radial acceleration in m/s^2 to rpm? completed in the same point of the axis of
rotation?
D) what is the radial acceleration in multiples of g of this point a rpm completed?
Sección: 8. Una uiltracentrifuga acelera desde el reposo hasta 90000 rpm en 1.90 min. (10
puntos) a) ¿Cuál es su aceleración angular en rad/s? b) ¿Cuál es la aceleración
tangencial deun punto a 8.20 cm del eje de rotación? c) ¿Cuál es la aceleración radial en
m/s2 arm completas enel mismo punto que la parte anterior? d) ¿Cuál es la aceleración
radial en múltiplos de g de este punto a rpm completas?
Solution
a)
Final angular velocity in rad/s
W=90000*(2pi/60) =9424.78 rad/s
From
W=W o +alpha*t
9424.78 =0 +alpha*(1.9*60)
alpha =82.6735 rad/s 2
b)
tangential acceleration
a t =r*alpha =0.082*82.6735=6.78 m/s 2
c)
Radial acceleration
a r =W 2
r = (9424.78) 2
*0.082 =7283768 m/s 2
d)
in terms of g
a r =7283768g/9.81 =742,484g

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An ultracentrifuge acelerates from rest up to 90000 rpm in 1-9 minutes.docx

  • 1. An ultracentrifuge acelerates from rest up to 90000 rpm in 1.9 minutes. A) what is it angular acceleration in rad/s^2? B) what is the tangencial acceleration of a point of 8.20 como from the axis of rotation? C) what is the radial acceleration in m/s^2 to rpm? completed in the same point of the axis of rotation? D) what is the radial acceleration in multiples of g of this point a rpm completed? Sección: 8. Una uiltracentrifuga acelera desde el reposo hasta 90000 rpm en 1.90 min. (10 puntos) a) ¿Cuál es su aceleración angular en rad/s? b) ¿Cuál es la aceleración tangencial deun punto a 8.20 cm del eje de rotación? c) ¿Cuál es la aceleración radial en m/s2 arm completas enel mismo punto que la parte anterior? d) ¿Cuál es la aceleración radial en múltiplos de g de este punto a rpm completas? Solution a) Final angular velocity in rad/s W=90000*(2pi/60) =9424.78 rad/s From W=W o +alpha*t 9424.78 =0 +alpha*(1.9*60) alpha =82.6735 rad/s 2 b) tangential acceleration a t =r*alpha =0.082*82.6735=6.78 m/s 2 c)
  • 2. Radial acceleration a r =W 2 r = (9424.78) 2 *0.082 =7283768 m/s 2 d) in terms of g a r =7283768g/9.81 =742,484g