1. Which of the following angles equals 2p radians?
3600
1800 00
3.140

2. How would an angle in radians be converted to an angle in degrees?
The angle in radians would be multiplied by 1800/p
The angle in radians would be multiplied by 3600/p
The angle in radians would be multiplied by 1800/2p
The angle in radians would be multiplied by 2p/3600

3. At the Equator the Earth has a radius of m and it rotates 3600 every 24 hours. What is the angular displacement of a person standing at the equator for 3 hours?
0.26 rad
0.52 rad
0.78 rad
0.39 rad

4. A child sits on a carousel at a distance of 3
A child sits on a carousel at a distance of 3.5 m from the center and rotates through an arc length of 6.5 m. What is the angular displacement of the child?
1.9 rad
0.93 rad
3.0 rad
5.0 rad

5. A ceiling fan initially at rest accelerates to a final angular speed of 0.70 rad/s and rotates through an angular displacement of 4.90 rad. What is the Ferris wheel’s average angular acceleration?
0.10 rad/s2
0.05 rad/s2
1.80 rad/s2
0.60 rad/s2

6. The end of the cord on a weed cutter is 0. 15 m in length
The end of the cord on a weed cutter is 0.15 m in length. If the motor rotates at the rate of 126 rad/s, what is the tangential speed of the cord?
628 m/s
25 m/s
19 m/s
63 m/s

7. 1.0 rad/s 2.0 rad/s 3.2 rad/s 4.0 rad/s
A stone on the edge of a tire with a radius of 0.25 m has a centripetal acceleration of 4.0 m/s2. What is the tire’s angular speed?
1.0 rad/s
2.0 rad/s
3.2 rad/s
4.0 rad/s

8. A 0.40 kg ball on a 0.50 m string rotates in a circular path in a vertical plane. If a constant angular speed of 8.0 rad/s is maintained, what is the force that maintains circular motion when the ball is at the top of the circle?
9.0 N
11 N
13 N
10.0 N

9. The direction of an object’s centripetal acceleration while moving in uniform circular motion is
a. Tangent to the circle
b. Opposite to the direction of motion
c. Toward the center of the circle
d. Outward from the center of the circle

10. The direction of an object’s linear speed while moving in uniform circular motion is
a. Tangent to the circle
b. Opposite to the direction of motion
c. Toward the center of the circle
d. Outward from the center of the circle

11. The direction of the force maintaining an object’s circular path is
a. Tangent to the circle
b. Opposite to the direction of motion
c. Toward the center of the circle
d. Outward from the center of the circle