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1. A right angle has 90o. Express this angle in radians.   Answer (45.0K)

2. An automobile engine is described as operating at 5000 rpm, meaning its crankshaft completes 5000 revolutions per minute. Express this angular velocity in radians per second.   Answer (41.0K)

3. An object that starts from rest experiences a constant angular acceleration of 2.0 rad / s2. What is its angular velocity after 5 seconds expressed in rad / s and in rev / s?   Answer (46.0K)

4. A force of 20 N is applied perpendicular to the end of a bar of length 0.5 m. Calculate the torque produced by the force.   Answer (38.0K)

5. A child of mass 20 kg is located 2.5 m from the fulcrum or pivot point of a seesaw. Where must a child of mass 30 kg sit on the seesaw in order to provide balance?   Answer (37.0K)

6. A torque of 30 N m is applied to a disk that has a moment of inertia of 5.0 kg m2. What is the resulting angular acceleration of the disk?   Answer (45.0K)

7. A mass of 2.0 kg, which may be considered to be a point mass, is attached to a string of length 0.3 m and is rotated at 8.0 rad / s. Calculate the moment of inertia of the mass about the axis and calculate its angular momentum.   Answer (44.0K)

8. A rotating toy of moment of inertia 2.0 kg m2 is rotating with an angular velocity of 3.0 rad / s when its moment of inertia is suddenly changed to 1.5 kg m2 because some of the mass is moved closer to the axis. Calculate the new angular velocity.   Answer (45.0K)

9. An object attached to a string of length 1.5 m rotates at an angular velocity of 3.0 rev / s. Calculate its linear velocity tangent to the circle in which it moves.   Answer (44.0K)

10. A force of 5.0 N is applied tangent to the edge of a disk of radius 0.8 m and mass 3.0 kg. Calculate the torque produced by this force and the resulting angular acceleration of the disk.   Answer (50.0K)

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