7. An object starts from rest and accelerates uniformly at 5 m/s2 for 3 seconds, then continues at a constant speed for 2s and finally accelerates uniformly at 2 m/s2 for 3 seconds.
a. Make a graph of the displacement vs. time and the velocity vs. time.
b. Find the final speed of the object.

If we relied solely on the nonrenewable resources found in the u.s., which one would we run out of first at current usage levels? a. natural gas b. oil c. uranium d. coal

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.

Lightning is an example of what phenomenon? a release of a large amount of energy an absorption of a large amount of energy a natural electric circuit a natural electric current