# Choosing the Best Career

Are you looking to choose a career? Let me help you. After reading this you’ll run off to the nearest university and register for classes. This will be a good thing for you and for the world.

Would you like people in parties to *Ooooooo* when they find out what you do? Would you like having a respectable salary while working in an air conditioned office for only 40 hours a week and rarely have to travel on business?

if so, then the best career for you is mechanical engineering.

Here is a question to get you started. Look around you right now:

**Other than living things (people, plants, pets),**

**can you see anything that has been constructed**

**without the aid of a mechanical engineer?**

Look hard. Take your time. I’ll wait.

(Ten minutes pass.)

While you’re pondering, let me point out that the jet ski shown in the photograph above wouldn’t exist if it weren’t for mechanical engineers. And the photograph of it wouldn't exit without mechanical engineers, either.

Let me help you with your answer:

The clothing you’re wearing was woven by machines designed by mechanical engineers.

The pencils and pens on your desk were manufactured by machines designed by mechanical engineers.

The paint on your walls was mixed by machines designed by mechanical engineers.

The half-eaten Big Mac hamburger beside you was prepared using tools and machines designed by mechanical engineers.

The paper on your desk was manufactured by machines designed by mechanical engineers.

The structure holding your cellphone’s electronics together was designed by mechanical engineers.

If you wear eyeglasses, they were constructed using machines designed by mechanical engineers.

Your lilac’s flower pot was manufactured by machines designed by mechanical engineers.

Your fingernails were clipped by a fingernail clipper designed by a mechanical engineer.

Just how broadly do mechanical engineers affect your life?

Without mechanical engineers, you’d have to get your food from your

garden you tilled using wooden tools you carved with sharp rocks.

Yes, mechanical engineers should be worshiped!

**Why is mechanical engineering the best career?**

Here are just some reasons why no other career beats mechanical engineering:

There are rarely too many mechanical engineers.

Colleges do not artificially restrict the number of mechanical engineering students, as they do regularly for many medical and legal professions.

Only a bachelor’s degree is required. No continuing education or licensing necessary.

Everyone thinks you’re smart.

Mature people seek relationships with professionals whose careers give them evenings and weekends off.

__Tip__: You don’t want to marry an immature person.Mechanical engineering is a fact-based profession. You will almost always get your way with your supervisor if physics is on your side. If physics is not on your side, you have no business presenting your idea to management.

Physics is not subject to opinion, pride, or politics. Good mechanical engineers have zero ego, and should never have a “dog in the fight” or a “stake in the outcome.” Infighting and competition have no place in the mechanical engineering field. If you abhor politics, become a mechanical engineer.

Low stress-to-salary ratio. Doctors and lawyers make more money than mechanical engineers. But their jobs are much, much more stressful.

If a mechanical design fails during initial testing, the design does not sue the engineer.

**Four years of college**

What about those four years of tough engineering courses? Yes, they’re tough. But they provide a comfortable, stable career the rest of your live when compared to other professions.

The math presented in college homework, labs, and exams is far more complex than what is required in real life. For example, here is an equation representing the *first law of thermodynamics*. This is the typical sort of equation taught in an engineering course:

**Before you run away**, you must know that I have never used this equation in its entirety. Never once. This is because the equation represents just about EVERYTHING that can happen to something. Never in real life does everything happen at once.

For example, while inflating a balloon, you’re not at the same time likely to,

Submerge it in water.

Drop it off a cliff.

Catch it on fire.

Accelerate it to Mach 10.

Pour sulfuric acid on it.

Place it in outer space.

Generally only small portions of large equations are used at any given time. This makes life for engineers much easier. Below is a typical application of the first law of thermodynamics:

In English it means:

The kinetic energy of a moving object is equal to

one-half its mass times the square of its velocity.

Notice the equation is much smaller than the complete equation shown above it. You may not be familiar with the terms, but that makes it a problem of understanding terms, not a math issue.

**Why, then, is a four-year engineering degree required?**

The issue isn't the math, but rather to learn which principles and equations should apply at any given time. How to apply them is what is difficult, not the equations themselves.

**The Expert Button-Pusher**

The story is told of a company that used a complex machine with many buttons, levers, and dials. The machine worked so well and for so long that everyone working at that company forgot what the buttons, levers, and dials did.

One day, the machine stopped working. No one at the company knew how to get it going again. They found an expert who lived across the country. They paid him five thousand dollars to come and get the machine working again.

The expert arrived. He looked over the machine for a few minutes and then pushed one button.

The machine began working perfectly again.

The company management who hired the expert complained and said, “We paid you five thousand dollars to push one button?”

“Yes,” the expert said, “but I knew which button to push.”

That is the story of mechanical engineering.

**The math is easier than you think**

I list below the most common equations I have used throughout my career. You’ll see that they make use of only ordinary algebra. No matrix algebra. No systems of vectored, partial differential equations. None of the equations shown here go beyond high school math:

There are exceptions, of course. Occasionally I must set up and solve a differential equation. But they are the exception rather than the norm. The terminology may be unfamiliar to you, but the math is not complex.

The question of *how to apply principles* applies to any career. Take plumbing, for example:

Just solder some pipes together.

*“Hold on!”* you say. *“That’s where skill and craftsmanship come in.” *And you’re right. Skill and craftsmanship come from experience. This applies to all professions, including engineering, plumbing, and coaching football.

**Two examples**

I provide here two examples of relatively simple math that can produce astounding results.

I own a Toyota Highlander SUV. Its average weight is published at about 4,400 pounds. If I estimate that about 6-inches by 6-inches of each of its four tires touches the road at any given time, I can calculate the air pressure in those tires.

Remember the following equation from the above list:

With some algebra, we can rearrange the equation to represent pressure:

The equation says that pressure (P) is created when an applied force (F) is distributed over a certain area (A). The pressure in my Toyota Highlander’s tires calculates to be:

Automobiles aren't exciting enough for you? What about modern airliners?

The maximum takeoff weight of a Boeing 777-300 ER airliner is 775,000 pounds. The surface area of the wings of a Boeing 777-300 ER airliner is 672,768 square inches. With these two numbers I can calculate an astonishing number:

It's amazing to me that a 387-ton jetliner can lift off the ground with only a 1.2 psi difference in air pressure between the upper and lower surfaces of the wings. That ain’t much!

**Trigonometry**

*“Simple division is one thing,”* you say, *“but what about complex trigonometry?”*

An entire college semester of trigonometry can be reduced to the following figure. I know this is true because I’ve taken only one trigonometry class in my life, and that was over thirty years ago. All I remember from that class is this figure:

All the trigonometry I have needed in my career comes from this figure. I realize that learning trigonometry in a classroom is a shock to the mind and soul. But *applied* trigonometry is much less complicated.

**Calculus**

I’ve written an __entire post__ on calculus, which you should read. It will be fun.

Engineering students must take three semesters of calculus (integration) and one semester of differential equations. Differential equations are integration in reverse.

Want to know a great secret?

There is software out there that can solve every math problem you can dream up. The best of these products is a program called, *Mathcad*. *Mathcad* is a word processor for equations.

The following scary integral calculates the percentage confidence of 99.73% over a statistical spread of three standard deviations.

Using *Mathcad*, I typed the above equation on the left side of the equal sign. When I tapped the equal sign character, the answer of 99.73% appeared.

How easy is that? *Mathcad* did all the work.

**But that’s cheating!**

*“You let the computers do all the work,”* you say.

This is my whole point! Have you ever picked up a cellphone or calculator and asked it for the square root of a number, say, the square root of 456.7? You type in the number 456.7 and then press the “square root” key. Then the machine does the work.

Is that cheating?

Do you have any idea ** how much work** your dear cellphone or calculator must do to come up with that answer? Your electronic device must perform the following function, or one similar to it:

How would you like to solve that one on your own?

Below is a computer program I wrote using *Mathcad* that calculates the square root of a number without using a square root function. This is another approach calculators may use to calculate square root:

Unless you like doing all that work by hand, don’t accuse me of cheating.

**3D modeling and analysis**

Modern engineering software allows engineers to create entire three-dimensional designs virtually on computer and then test them for,

Vibration

Thermal effects

Tolerance analysis

Mass and weight/balance

Stress, metal fatigue, and cycle life

Liquid or gas flow (if it’s a hydraulic or pneumatic design)

These analyses are done before the design physically exists in real life. This way, when the parts are finally made, hopefully all the design mistakes have already been made and fixed.

**3D metal printing**

The same 3D modeling capability that can render realistic images on the computer screen can send the files to metal printing machines that can manufacture (literally "print out") entire parts without the touch of a human being. Metal printers can print titanium parts (1/3 lighter than steel) which are just as strong as traditionally machined steel parts.

**Bottom line**

Gone is the drudgework that used to be required of mechanical engineers. No more,

Slide rules

Clay models

Drafting boards

Piles of calculations

White shirts and ties

Handheld calculators (I don’t own one!)

Today is the best time in the history of the world to be a mechanical engineer.

This makes you an extraordinary lucky person!