A 2.00 kg solid sphere (I = 2/5 
) with a diameter of 50.0 cm is rotating at an angular velocity of 5.0 rad/s. The angular momentum of the rotating sphere is
A. 0.55 kg 
B. 0.48 kg
C. 0.37 kg
D. 0.25 kg
E. 0.20 kg
D. 0.25 kg
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A camera with a 50.0 mm lens is designed to focus from 1.00 m to infinity. What is the distance of travel of the lens with respect to the film plane over this range of focus?
A. 50.0 mm B. 52.6 mm C. 47.4 mm D. 5.30 mm E. 2.60 mm
Surrounding every magnet is
A) a magnetic field. B) an electric field. C) both of these D) neither of these
For every action force, there must be a reaction force that
A) acts in the same direction. B) is slightly smaller in magnitude than the action force. C) is slightly larger in magnitude than the action force. D) is equal in magnitude.
A long hollow cylindrical conductor (inner radius = 2.0 mm, outer radius = 4.0 mm) carries a current of 24 A distributed uniformly across its cross section. A long wire which is coaxial with the cylinder carries an equal current in the opposite direction. What is the magnitude of the magnetic field 3.0 mm from the axis?
A. 0.82 mT B. 0.93 mT C. 0.70 mT D. 0.58 mT E. 0.40 mT