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# vector expression of acceleration and velocity of rigid body

1. The vector expression of an acceleration can be obtained by:
a. Differentiation position vector once
b. Differentiation velocity vector once
c. Differentiation position vector three times
d. Differentiation velocity vector twice

2. The work of forces acting on a rigid body can be expressed as:
a. the dot product of the force and the velocity vector
b. the cross product of the force and the position vector
c. the dot product of the force and the position vector
d. the cross product of the force and the moment vector

3. For a constant moment, the work done by the moment can be expressed by:
a. the moment times the angular displacement in degrees
b. the moment times the angular displacement in radians
c. the force times the angular displacement in degrees
d. the moment times the velocity

4. The kinetic energy of a rigid body rotating about a noncentroidal axis through O can be expressed as the mass moment of inertia about O times the square of angular velocity.
a. True
b. False

5. When a rigid body rotates about a fixed axis, the velocity vector can be expressed by a cross product of the angular velocity vector and the position vector.
a. True
b. False

#### Solution Summary

The solution provides detailed explanations to the given multiple choices problems.

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