• #### 1.  A person sits on a freely spinning lab stool that has no friction in its axle. When this person extends her arms,

• her moment of inertia increases and her angular speed decreases.
• her moment of inertia decreases and her angular speed increases.
• her moment of inertia increases and her angular speed increases.
• her moment of inertia increases and her angular speed remains the same.
• #### 2.  When this girl lets go of her string, what happens to the ball?

• it flies straight due to law of inertia
• it flies straight due to law of centripetal force
• it curves due to rotational inertia
• it curves due to its tangential speed

• 5 m/s2
• 17.63 m/s2
• 10 m/s2
• 8.81 m/s2
• #### 4.  Which forms of energy are present for objects rolling down an incline?

• Gravitational potential energy
• Rotational kinetic energy
• Kinetic energy
• All of above

• 8.23 m/s2
• 10.54 m/s2
• 12.86 m/s2
• 17.39 m/s2

• 320 kg^2
• 352 kg*m^2
• 176 kg*m^2
• 141.75 m^2
• #### 7.  When 6.0 Nm of torque is applied to a wheel it constantly accelerates at 30 rad/s^2. What is the moment of inertia of the wheel? Hint: T = IαHint:\ T\ =\ I\alphaHint: T = Iα

• 2 Nm22\ Nm^22 Nm2
• 0.20 Nm20.20\ Nm^20.20 Nm2
• 20.0 Nm220.0\ Nm^220.0 Nm2
• Undefined because it′s 10Undefined\ because\ it's\ \frac{1}{0}Undefined because it′s 01​

• Hoop
• Solid Disk

• 0.1 s
• 0.2 s
• 0.3 s
• 0.5 s