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Question :
26. A 4.0-kg mass placed at (3.0, 4.0) m, and : 2102171

26. A 4.0-kg mass is placed at (3.0, 4.0) m, and a 6.0-kg mass is placed at (3.0, -4.0) m. What is the moment of inertia of this system of masses about the *y*-axis?

A. 160 kg?m^{2}

B. 90 kg?m^{2}

C. 250 kg?m^{2}

D. 180 kg?m^{2}

27. A 4.0-kg mass is placed at (3.0, 4.0) m, and a 6.0-kg mass is placed at (3.0, -4.0) m. What is the moment of inertia of this system of masses about the *z*-axis?

A. 160 kg?m^{2}

B. 90 kg?m^{2}

C. 250 kg?m^{2}

D. 180 kg?m^{2}

28. If a net torque is applied to an object, that object will experience:

A. a constant angular speed.

B. an angular acceleration.

C. a constant moment of inertia.

D. an increasing moment of inertia.

29. According to Newton's second law, the angular acceleration experienced by an object is directly proportional to:

A. its moment of inertia.

B. the net applied torque.

C. the object's size.

D. choices a and b above are both valid.

30. A ventilation fan with a moment of inertia of 0.034 kg?m^{2} has a net torque of 0.11 N?m applied to it. What angular acceleration does it experience?

A. 5.3 rad/s^{2}

B. 4.0 rad/s^{2}

C. 3.2 rad/s^{2}

D. 0.31 rad/s^{2}