For items 7-13 choose the letter of the best answer. No need to give explanations. 7. A force of 17 N is applied to the end of a 0.63-m long torque wrench at an angle 45° from a line joining the pivot point to the handle. What is the magnitude of the torque about the pívot point produced by this force? A. 10.7 N.m B. 9.7 N.m C. 12.0 N.m D. 7.6 N.m 8.How long does it take for a rotating object to speed up from 15.0 rad/s to 33.3 rad/s if it has a uniform angular acceleration of 3.45 rad/s2? A. 4.35 s B. 5.30 s C. 10.6 s D. 63.1 s 9. A boy and a girl are balanced on a massless seesaw. The boy has a mass of 60 kg and the girl's mass is 50kg. If the boy sits 1.5 m from the pivot point on one side of the seesaw, where must the girl sit on the other side for equilibrium? A. 1.8 m В. 1.3 m C. 2.5 m D. 3.0 m 10. A pulley has an initial angular speed of 12.5 rad/s and a constant angular acceleration of 3.41 rad/s2. Through what angle does the pulley turn in 5.26 s? A. 113 rad B. 22.6 rad С. 19.3 rad D. 160 rad
For items 7-13 choose the letter of the best answer. No need to give explanations. 7. A force of 17 N is applied to the end of a 0.63-m long torque wrench at an angle 45° from a line joining the pivot point to the handle. What is the magnitude of the torque about the pívot point produced by this force? A. 10.7 N.m B. 9.7 N.m C. 12.0 N.m D. 7.6 N.m 8.How long does it take for a rotating object to speed up from 15.0 rad/s to 33.3 rad/s if it has a uniform angular acceleration of 3.45 rad/s2? A. 4.35 s B. 5.30 s C. 10.6 s D. 63.1 s 9. A boy and a girl are balanced on a massless seesaw. The boy has a mass of 60 kg and the girl's mass is 50kg. If the boy sits 1.5 m from the pivot point on one side of the seesaw, where must the girl sit on the other side for equilibrium? A. 1.8 m В. 1.3 m C. 2.5 m D. 3.0 m 10. A pulley has an initial angular speed of 12.5 rad/s and a constant angular acceleration of 3.41 rad/s2. Through what angle does the pulley turn in 5.26 s? A. 113 rad B. 22.6 rad С. 19.3 rad D. 160 rad
For items 7-13 choose the letter of the best answer. No need to give explanations. 7. A force of 17 N is applied to the end of a 0.63-m long torque wrench at an angle 45° from a line joining the pivot point to the handle. What is the magnitude of the torque about the pívot point produced by this force? A. 10.7 N.m B. 9.7 N.m C. 12.0 N.m D. 7.6 N.m 8.How long does it take for a rotating object to speed up from 15.0 rad/s to 33.3 rad/s if it has a uniform angular acceleration of 3.45 rad/s2? A. 4.35 s B. 5.30 s C. 10.6 s D. 63.1 s 9. A boy and a girl are balanced on a massless seesaw. The boy has a mass of 60 kg and the girl's mass is 50kg. If the boy sits 1.5 m from the pivot point on one side of the seesaw, where must the girl sit on the other side for equilibrium? A. 1.8 m В. 1.3 m C. 2.5 m D. 3.0 m 10. A pulley has an initial angular speed of 12.5 rad/s and a constant angular acceleration of 3.41 rad/s2. Through what angle does the pulley turn in 5.26 s? A. 113 rad B. 22.6 rad С. 19.3 rad D. 160 rad
For items 7-13 choose the letter of the best answer. No need to give explanations.
7. A force of 17 N is applied to the end of a 0.63-m long torque wrench at an angle 45° from a line joining the pivot point to the handle. What is the magnitude of the torque about the pívot point produced by this force?
A. 10.7 N.m
B. 9.7 N.m
C. 12.0 N.m
D. 7.6 N.m
8.How long does it take for a rotating object to speed up from 15.0 rad/s to 33.3 rad/s if it has a uniform angular acceleration of 3.45 rad/s2?
A. 4.35 s
B. 5.30 s
C. 10.6 s
D. 63.1 s
9. A boy and a girl are balanced on a massless seesaw. The boy has a mass of 60 kg and the girl's mass is 50kg. If the boy sits 1.5 m from the pivot point on one side of the seesaw, where must the girl sit on the other side for equilibrium?
A. 1.8 m
В. 1.3 m
C. 2.5 m
D. 3.0 m
10. A pulley has an initial angular speed of 12.5 rad/s and a constant angular acceleration of 3.41 rad/s2. Through what angle does the pulley turn in 5.26 s?
A. 113 rad
B. 22.6 rad
С. 19.3 rad
D. 160 rad
11. At t=0, a wheel rotating about a fixed axis at a constant angular acceleration has an angular velocity of 2.0 rads. Two seconds later it has turned through 5.0 complete revolutions. What is the angular acceleration of this wheel?
A. 17 rad/s2
B. 14 rad/s?
C. 20 rad/s2
D. 23 rad/s?
12. At t=0, a wheel rotating about a fixed axis at a constant angular acceleration of-0.40 rad/s2 has an angular velocity of 1.5 rad/s and an angular position of 2.3 rad. What is the angular position of the wheel at t=2.0s ?
A. 4.9 rad
B. 4.7 rad
C. 4.5 rad
D. 4.3 rad
13. A wheel rotating about a fixed axis has an angular position given by 0 = 3.0 - 2.0t3, where angular displacement is measured in radians and t in seconds. What is the angular acceleration of the wheel at t = 2.0 s?
A. -1.0 rad/s2
B. -24 rad/s2
C.-2.0 rad/s2
D.-4.0 rad/s?
Definition Definition Rate of change of angular velocity. Angular acceleration indicates how fast the angular velocity changes over time. It is a vector quantity and has both magnitude and direction. Magnitude is represented by the length of the vector and direction is represented by the right-hand thumb rule. An angular acceleration vector will be always perpendicular to the plane of rotation. Angular acceleration is generally denoted by the Greek letter α and its SI unit is rad/s 2 .
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