공학개론 포기 하기로 했음 and 작년 우리교수 시험 문제

[[03]권호]

공학개론 시험 포기하기로 했음...

같이 포기할 사람은 리플을 달아주시오 -_-~;;






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1.용어들을 간략히 설명하시오. 각 10점

(a) stress and strain

(b) area moment of inertia and mass moment of inertia

(c) mean value and standard deviation

(d) absolute pressure and gauge pressure

(e) elastic modulus and bulk modulus

(f) moment and couple



2.차량 충돌시, 안전밸트의 승객 보호 역할과 관련된 다음의 글을 읽고 선형 충격량, 모멘텀(linear impulse and momentum) 등의 물리량에 대하여 간략히 서술하시오.(40점)

The basic idea of a seatbelt is very simple: It keeps you from flying through the windshield or hurdling toward the dashboard when your car comes to an abrupt stop. But why would this happen in the first place? In short, because of inertia.
Inertia is an object's tendency to keep moving until something else works against this motion. To put it another way, inertia is every object's resistance to changing its speed and direction of travel. Things naturally want to keep going.

If a car is speeding along at 50 miles per hour, inertia wants to keep it going 50 mph in one direction. Air resistance and friction with the road are constantly slowing it down, but the engine's power compensates for this energy loss.

Anything that is in the car, including the driver and passengers, has its own inertia, which is separate from the car's inertia. The car accelerates riders to its speed. Imagine that you're coasting at a steady 50 miles per hour. Your speed and the car's speed are pretty much equal, so you feel like you and the car are moving as a single unit.

But if the car were to crash into a telephone pole, it would be obvious that your inertia and the car's were absolutely independent. The force of the pole would bring the car to an abrupt stop, but your speed would remain the same. Without a seatbelt, you would either slam into the steering wheel at 50 miles per hour or go flying through the windshield at 50 miles per hour. Just as the pole slowed the car down, the dashboard, windshield or the road would slow you down by exerting a tremendous amount of force.

It is a given that no matter what happens in a crash, something would have to exert force on you to slow you down. But depending on where and how the force is applied, you might be killed instantly or you might walk away from the damage unscathed.

If you hit the windshield with your head, the stopping power is concentrated on one of the most vulnerable parts of your body. It also stops you very quickly, since the glass is a hard surface. This can easily kill or severely injure a person.

A seatbelt applies the stopping force to more durable parts of the body over a longer period of time



=================================================명은누나한테받았음
답을 아시는 분은 올려주세요.~

수업 잘으시던..수찬이형 김동헌군 김윤호군 제이제이군 김윤중군 김민호군 또.... 또..;; 부탁합니다 -_-a

[[03]준]

제이제이라니!!! 절대 제이제이가 아닙니다!!!

[사현*@.@*03]

젠장 해석도안되네ㅡㅡ;;

[[03]강호연]

마지막 ㅅㅣ험이다..우리모두 유종의 미를.....흑흑..

[[03] 김동헌]

마지막 시험이라니????....물리 시험도 남았고, 포트란 시험도 남았는데....... 물리 시험 끝나면 한주 쉬고 또 시험일껄...???

[[03] 윤중]

쿨럭.. 40점짜리 문제라니..! .. 문장이 책보다 더 어려운거같은데..

[[03]민호]

크캬캬캬캬 제이제이래~~~~ 떴구나 떴어 탐슨제이제이 참... 난 수업 잘안들었다 ( '-')