Question

9) A 20.0-kg child sits on one end of a long uniform beam having a mass of 30.0 kg, and a 30.0-kg child sits on the other end. If the beam is 2.00 m long, how far from the center of the beam must the fulcrum be placed for the system to balance? A) 0.143 m B) 0.111 m C) 0.125 m D) 0.107 m E) 0.133 m 10) A turbine blade rotates with angular velocity function given by ?(t) = a + bt². What is the angular acceleration of the blade at t = 2.8 s? The constants are a = 3.3 rad/s, and b = -0.41 rad/s³. A) 0.086 rad/s² B) 1.0 rad/s² C) -2.3 rad/s² D) -2.7 rad/s² E) 18 rad/s² 11) A 4.50-kg wheel that is 34.5 cm in diameter performs five full rotations as it slows down uniformly from 22.0 rad/s to 13.5 rad/s. What is the magnitude of the angular acceleration of the wheel? A) 0.135 rad/s² B) 30.2 rad/s² C) 6.33 rad/s² D) 4.80 rad/s² E) 0.850 rad/s²

          9) A 20.0-kg child sits on one end of a long uniform beam having a mass of 30.0 kg, and a 30.0-kg child sits on the other end. If the beam is 2.00 m long, how far from the center of the beam must the fulcrum be placed for the system to balance?
A) 0.143 m
B) 0.111 m
C) 0.125 m
D) 0.107 m
E) 0.133 m

10) A turbine blade rotates with angular velocity function given by ?(t) = a + bt². What is the angular acceleration of the blade at t = 2.8 s? The constants are a = 3.3 rad/s, and b = -0.41 rad/s³.
A) 0.086 rad/s²
B) 1.0 rad/s²
C) -2.3 rad/s²
D) -2.7 rad/s²
E) 18 rad/s²

11) A 4.50-kg wheel that is 34.5 cm in diameter performs five full rotations as it slows down uniformly from 22.0 rad/s to 13.5 rad/s. What is the magnitude of the angular acceleration of the wheel?
A) 0.135 rad/s²
B) 30.2 rad/s²
C) 6.33 rad/s²
D) 4.80 rad/s²
E) 0.850 rad/s²

9) A 20.0-kg child sits on one end of a long uniform beam having a mass of 30.0 kg, and a 30.0-kg child sits on the other end. If the beam is 2.00 m long, how far from the center of the beam must the fulcrum be placed for the system to balance?
A) 0.143 m
B) 0.111 m
C) 0.125 m
D) 0.107 m
E) 0.133 m

10) A turbine blade rotates with angular velocity function given by ?(t) = a + bt². What is the angular acceleration of the blade at t = 2.8 s? The constants are a = 3.3 rad/s, and b = -0.41 rad/s³.
A) 0.086 rad/s²
B) 1.0 rad/s²
C) -2.3 rad/s²
D) -2.7 rad/s²
E) 18 rad/s²

11) A 4.50-kg wheel that is 34.5 cm in diameter performs five full rotations as it slows down uniformly from 22.0 rad/s to 13.5 rad/s. What is the magnitude of the angular acceleration of the wheel?
A) 0.135 rad/s²
B) 30.2 rad/s²
C) 6.33 rad/s²
D) 4.80 rad/s²
E) 0.850 rad/s²

Added by Lisa R.

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