Physics

# Multiple Choice

PhysicsMultiple Choice

### 6.1Angle of Rotation and Angular Velocity

23.

What is 1 radian approximately in degrees?

1. 57.3°
2. 360°
3. π°
4. 2π°
24.

If the following objects are spinning at the same angular velocities, the edge of which one would have the highest speed?

1. Mini CD
2. Regular CD
3. Vinyl record
25.
What are possible units for tangential velocity?
1. $m slash s$
2. $rad slash s$
3. $Superscript ring Baseline slash s$
26.
What is $30 Superscript ring$ in radians?
1. $StartFraction pi Over 12 EndFraction$
2. $StartFraction pi Over 9 EndFraction$
3. $StartFraction pi Over 6 EndFraction$
4. $StartFraction pi Over 3 EndFraction$
27.
For a given object, what happens to the arc length as the angle of rotation increases?
1. The arc length is directly proportional to the angle of rotation, so it increases with the angle of rotation.
2. The arc length is inversely proportional to the angle of rotation, so it decreases with the angle of rotation.
3. The arc length is directly proportional to the angle of rotation, so it decreases with the angle of rotation.
4. The arc length is inversely proportional to the angle of rotation, so it increases with the angle of rotation.

### 6.2Uniform Circular Motion

28.

Which of these quantities is constant in uniform circular motion?

1. Speed
2. Velocity
3. Acceleration
4. Displacement
29.

Which of these quantities impact centripetal force?

1. Mass and speed only
4. Mass, speed, and radius all impact centripetal force
30.

An increase in the magnitude of which of these quantities causes a reduction in centripetal force?

1. Mass
3. Speed
31.
What happens to centripetal acceleration as the radius of curvature decreases and the speed is constant, and why?
1. It increases, because the centripetal acceleration is inversely proportional to the radius of the curvature.
2. It increases, because the centripetal acceleration is directly proportional to the radius of curvature.
3. It decreases, because the centripetal acceleration is inversely proportional to the radius of the curvature.
4. It decreases, because the centripetal acceleration is directly proportional to the radius of the curvature.
32.
Why do we experience more sideways acceleration while driving around sharper curves?
1. Centripetal acceleration is inversely proportional to the radius of curvature, so it increases as the radius of curvature decreases.
2. Centripetal acceleration is directly proportional to the radius of curvature, so it decreases as the radius of curvature decreases.
3. Centripetal acceleration is directly proportional to the radius of curvature, so it decreases as the radius of curvature increases.
4. Centripetal acceleration is directly proportional to the radius of curvature, so it increases as the radius of curvature increases.

### 6.3Rotational Motion

33.

Which of these quantities is not described by the kinematics of rotational motion?

1. Rotation angle
2. Angular acceleration
3. Centripetal force
4. Angular velocity
34.

In the equation , what is F?

1. Linear force
2. Centripetal force
3. Angular force
35.
What happens when two torques act equally in opposite directions?
1. Angular velocity is zero.
2. Angular acceleration is zero.
36.
What is the mathematical relationship between angular and linear accelerations?
1. $a equals r alpha$
2. $a equals StartFraction alpha Over r EndFraction$
3. $a equals r squared alpha$
4. $a equals StartFraction alpha Over r squared EndFraction$