$$2 \frac{km}{h} \times \frac{1000\ m}{1\ km} \times \frac{1\ h}{3600\ s} = 0.556\ m/s$$

Question 1

Which of the following was the primary cause of the Tacoma Narrows Bridge collapse in 1940?

Accepted Answer

Aerodynamic flutter that was self-exciting and unbounded

Question 2

According to Newton's First Law, what happens to a body if the sum of all external forces acting on it is zero?

Accepted Answer

It remains at rest or moves with constant velocity

Question 3

Which of the following is NOT a fundamental assumption in statics?

Accepted Answer

Indeterminate structures

Question 4

A structural engineer is analyzing a bridge for static equilibrium. Which equation must be satisfied for the forces acting on the bridge?

Accepted Answer

$$\sum F = 0$$

Question 5

Convert a speed of 2 km/h to m/s using the unity approach. What is the correct answer?

Accepted Answer

$$2 \frac{km}{h} 	imes \frac{1000\ m}{1\ km} 	imes \frac{1\ h}{3600\ s} = 0.556\ m/s$$

Question 6

Which of the following is the correct SI unit for force?

Accepted Answer

$$1\ N = 1\ kg \cdot m/s^2$

Question 7

A pressure of 235 psi is to be converted to SI units (MPa). Which conversion factor should be used for pounds to Newtons?

Accepted Answer

$$1\ lb = 4.448\ N$$

Question 8

Which statement best describes Newton's Third Law?

Accepted Answer

For every force, there is an equal and opposite reaction force

Question 9

In the U.S. Customary System, what is the derived unit for mass?

Accepted Answer

Slug

Question 10

A structural engineer must consider the life cycle of a structure. Which phase involves analyzing the geometry and support points of a bridge?

Accepted Answer

Design

Question 11

If a force of 10 lb is applied to a mass of 2 slug, what is the acceleration produced according to Newton's Second Law in U.S. Customary units?

Accepted Answer

$$a = \frac{F}{m} = \frac{10\ lb}{2\ slug} = 5\ ft/s^2$

Question 12

Which of the following is a correct unit conversion for length from inches to millimeters?

Accepted Answer

$$1\ in = 25.4\ mm$$

Question 13

Why is it important for a structural engineer to consider environmental factors such as wind and vibration during the design phase?

Accepted Answer

To prevent failures like the Tacoma Narrows Bridge collapse

Question 14

Which of the following best describes the unity approach in unit conversion?

Accepted Answer

Multiplying by a conversion factor equal to one to change units without altering the value

Question 15

A mass of 1 slug will accelerate at what rate under a force of 1 lb in U.S. Customary units?

Accepted Answer

$$a = 1\ ft/s^2$

Question 16

Which of the following is a derived SI unit?

Accepted Answer

Newton (N)

Question 17

If a body is in static equilibrium, which of the following must be true?

Accepted Answer

$$\sum F = 0$$ and $$\sum M = 0$$

Question 18

Which of the following is a correct statement about determinant structures in statics?

Accepted Answer

They have just enough supports and constraints to maintain equilibrium

Question 19

A pressure of 235 psi is equivalent to how many MPa? (Use $$1\ lb = 4.448\ N$$, $$1\ in^2$ = 0.00064516\ m^2$, 1$$\ MPa = $$10^6$$\ Pa$$)

Accepted Answer

$$1.62\ MPa$$

Question 20

Which of the following is NOT a base unit in the SI system?

Accepted Answer

Newton (N)

Statics: Chapter 1 – Introduction and Basics

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