Which of the following describes sound waves?
A. Mechanical waves in which the vibrations are perpendicular to the
motion of the sound
B. Electromagnetic waves in which the vibrations are parallel to the
motion of the sound
C. Electromagnetic waves in which the vibrations are perpendicular
to the motion of the sound
D. Mechanical waves in which the vibrations are parallel to the
motion of the sound

Choose a realistic problem for which these are the correct freebody diagrams. be sure that the answer that the problem requests is consistent with the diagrams shown. choose a realistic problem for which these are the correct freebody diagrams. be sure that the answer that the problem requests is consistent with the diagrams shown. a 1.0 kg block is placed on top of a 2.0 kg block. a horizontal rope pulls the 2.0 kg block across a frictionless floor with a force of 21.0 n. the coefficient between the two blocks is 0.75. does the 1.0 kg block on top slide?