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# Engineering Mechanics - General Principles

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### Exercise

• General Questions
"It takes a very long time to become young."
- Pablo Picasso
1.

Solve the following equation for the two roots of x:   x2 — 16 = 0

 A. x = 2i,   –2i B. x = 4i,   –4i C. x = 4,   –4 D. x = 2,   –2

2.

Using the basic trigonomic functions, determine the length of side AB of the right triangle.

 A. h = 7.07 B. h = 10 C. h = 5 D. h = 14.14

3.

Determine the angle :

 A. = 30° B. = 40° C. = 60° D. = 50°

4.

Solve the following equation for x, y, and z:

xy + z = –1   –x + y + z = –1   x + 2y – 2z = 5

 A. x = 1,      y = 1,      z = –1 B. x = 5/3,      y = 7/6,      z = –1/2 C. x = –2/3,      y = –2/3,      z = –1 D. x = –1,      y = 1,      z = 1

5.

Using the basic trigonomic functions, determine the length of side AB of the right triangle.

 A. h = 5.77 B. h = 11.55 C. h = 5 D. h = 8.66