According to statistics, currently there are approximately drug users living in the united states.
a. 22 million
b. 15 million
c. 10 million
d. 5 million

In what direction does the medium move relative to the direction of the wave? explain.

What is the speed of an object at a given moment?

Asolid round steel rod 6.25 mm in diameter and 375 mm long is rigidly bonded to the end of solid square brass rod 25 mm on a side and 300 mm long. the geometric axes of the bare are along the same line. an axial tensile force of 5.4 kn is applied at the extreme ends of the assembly. for steel e = 200 gpa and for brass e = 90 gpa. determine the total elongation for the assembly.