1. A right angle has 90^{o}. 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 / s^{2}. 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 m^{2}. 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 m^{2} is rotating
with an angular velocity of 3.0 rad / s when its moment of inertia is suddenly
changed to 1.5 kg m^{2} 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)
