Chapter 9 Physics

When a rigid body rotates about a fixed axis, all the points in the body have the same: 1. tangential acceleration 2. angular acceleration 3. centripetal acceleration 4. tangential speed 5. linear displacement

2. angular acceleration

A dumbbell-shaped object is composed by two equal masses, m, connected by a rod of negligible mass and length r. If I1 is the moment of inertia of this object with respect to an axis passing through the center of the rod and perpendicular to it and I2 is the moment of inertia with respect to an axis passing through one of the masses, it follows that: 1. I(1) > I(2) 2. I(1) = I(2) 3. I(2) > I(1)

3. I(2) > I(1)

As you are leaving a building, the door opens outward. If the hinges on the door are on your right, what is the direction of the angular velocity of the door as you open it?: 1. forwards 2. up 3. down 4. to your right 5. to your left

3. down

When you ride a bicycle, in what direction is the angular velocity of the wheels?: 1. to your right 2. forwards 3. backwards 4. to your left 5. up

4. to your left