The Student and The Barometer

Some time ago I received a call from a colleague. He was about to give a student a zero for his answer to a physics question, while the student claimed a perfect score. The instructor and the student agreed to an impartial arbiter, and I was selected.

I read the examination question: "Show how it is possible to determine the height of a tall building with the aid of a barometer." The student had answered: "Take the barometer to the top of the building, attach a long rope to it, lower it to the street, and then bring it up, measuring the length of the rope. The length of the rope is the height of the building."

The student really had a strong case for full credit since he had really answered the question completely and correctly! On the other hand, if full credit were given, it could well contribute to a high grade in his physics course and certify competence in physics, but the answer did not confirm this.

I suggested that the student have another try. I gave the student six minutes to answer the question with the warning that the answer should show some knowledge of physics. At the end of five minutes, he hadn't written anything. I asked if he wished to give up, but he said he had many answers to this problem; he was just thinking of the best one. I excused myself for interrupting him and asked him to please go on.

In the next minute, he dashed off his answer, which read: "Take the barometer to the top of the building and lean over the edge of the roof. Drop the barometer, timing its fall with a stopwatch. Then, using the formula x=0.5*a*t^2, calculate the height of the building." At this point, I asked my colleague if he would give up. He conceded, and gave the student almost full credit.

While leaving my colleague's office, I recalled that the student had said that he had other answers to the problem, so I asked him what they were. "Well," said the student, "there are many ways of getting the height of a tall building with the aid of a barometer. For example,if the sun is shining you could measure the height of the barometer, then set it on end and measure the length of its shadow. Then you measure the length of the skyscraper's shadow, and thereafter it is a simple matter of proportional arithmetic to work out the height of the skyscraper.

"Fine," I said, "and others?"

"Yes," said the student, "there is a very basic measurement method you will like. In this method, you take the barometer and begin to walk up the stairs. As you climb the stairs, you mark off the length of the barometer along the wall. You then count the number of marks, and this will give you the height of the building in barometer units." "A very direct method."

"Of course. If you want a more sophisticated method, you can tie the barometer to the end of a string, swing it as a pendulum, and determine the value of g [gravity] at the street level and at the top of the building. From the difference between the two values of g, the height of the building, in principle, can be calculated."

"On this same tack, you could take the barometer to the top of the building, attach a long rope to it, lower it to just above the street, and then swing it as a pendulum. You could then calculate the height of the building by the period of the precession".

"Finally," he concluded, "there are many other ways of solving the problem. Probably the best," he said, "is to take the barometer to the basement and knock on the superintendent's door. When the superintendent answers, you speak to him as follows: 'Mr. Superintendent, here is a fine barometer. If you will tell me the height of the building, I will give you this barometer."

At this point, I asked the student if he really did not know the conventional answer to this question. He admitted that he did, but said that he was fed up with high school and college instructors trying to teach him how to think.

The name of the student was Niels Bohr, who later received the Nobel prize for Physics.

Parent Job Description
Parent Job Description

POSITION :
Mom, Mommy, Mama, Ma
Dad, Daddy, Dada, Pa, Pop

JOB DESCRIPTION :
Long term, team players needed, for challenging
permanent work in an often chaotic environment.
Candidates must possess excellent communication
and organizational skills and be willing to work
variable hours, which will include evenings and weekends
and frequent 24 hour shifts on call.
Some overnight travel required, including trips to
primitive camping sites on rainy weekends and endless sports tournaments in far away cities!
Travel expenses not reimbursed.
Extensive courier duties also required.

RESPONSIBILITIES :

The rest of your life.
Must be willing to be hated, at least temporarily,
until someone needs $5.
Must be willing to bite tongue repeatedly.
Also, must possess the physical stamina of a
pack mule and be able to go from zero to 60 mph in three seconds flat in case, this time, the screams from
the backyard are not someone just crying wolf.
Must be willing to face stimulating technical challenges,
such as small gadget repair, mysteriously sluggish toilets
and stuck zippers.
Must screen phone calls, maintain calendars and
coordinate production of multiple homework projects.
Must have ability to plan and organize social gatherings
for clients of all ages and mental outlooks.
Must be willing to be indispensable one minute,
an embarrassment the next.
Must handle assembly and product safety testing of a
half million cheap, plastic toys, and battery operated devices.
Must always hope for the best but be prepared for the worst.
Must assume final, complete accountability for
the quality of the end product.
Responsibilities also include floor maintenance and
janitorial work throughout the facility.

POSSIBILITY FOR ADVANCEMENT & PROMOTION :

None.
Your job is to remain in the same position for years, without complaining, constantly retraining and updating your skills,
so that those in your charge can ultimately surpass you

PREVIOUS EXPERIENCE :

None required unfortunately.
On-the-job training offered on a continually exhausting basis.

WAGES AND COMPENSATION :

Get this!   You pay them!
Offering frequent raises and bonuses.
A balloon payment is due when they turn 18 because
of the assumption that college will help them
become financially independent.
When you die, you give them whatever is left.
The oddest thing about this reverse-salary scheme is that
you actually enjoy it and wish you could only do more.

BENEFITS :

While no health or dental insurance, no pension,
no tuition reimbursement, no paid holidays and
no stock options are offered, this job supplies limitless opportunities for personal growth, unconditional love,
and free hugs and kisses for life if you play your cards right.


Forward this on to all the parents you know in appreciation for everything they do on a daily basis,
letting them know they are appreciated
for the fabulous job they do...
or forward with love
to anyone thinking of applying for the job.          ** AND A FOOTNOTE   "THERE IS NO RETIREMENT"  --  EVER!