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Today's topic: How scary are people with good mechanics?
He probably didn't know how many five hours it took him to do mechanics back then.
Nowadays, children have a lot of math problems, and they can see the answers at a glance, but they don't let them use that, and they scratch their cheeks in a hurry to solve the problems.
"How to solve the problem of "launching a rocket on Earth to bypass the sun, and returning to the Earth, please list the equations and find the solution"?
I've seen this kind of simple but difficult problem once: the first college physics class in college, examining high school knowledge. Very simple question: design a spring for the classroom door to keep the door closed. Pull it through a certain angle to self-lock and maintain opening. The elastic coefficient and size of the spring are designed. The location of the anchor points on the door and door frame is optimized for the solution.
"This article does not need to refer to any literature", I have never seen such a person.
This is the thief of liberal arts, and then because of the needs of the country, the big guy who went to study science and engineering???
Grandpa is so good, I wish him peace and health!
On a magical planet, the ocean is a high-density fluid, plants are carbon fiber, the air is dense to viscous, and birds are nuclear-powered flight. Do you lack imagination and complain about the teacher?
The answerer was right, the teacher couldn't understand it, and then he went off topic and gave the answerer a zero score.
Learn to the extreme, a countdown will appear on your photo, and the whole universe will flash for you.
There is one thing to say, it is true that if you take simple material mechanics alone, what you implement from beginning to end is the idea of limits and differentiation, and you really can't learn high mathematics without learning it.
Curious about the estimation process...... The average pressure of the glass (half of the water depth) = ρgh = 1000 * 10 * 0.2 = 2000 Pa The area of the long-side glass = 4 * 0.4 = 1.6 m^2 The force on the long-side glass = 2000 * 1.6 = 3200 N, which should be about 320 kg, which is twice as much.
This is a normal person who has received a high school physics education will also feel that something is wrong, the length of 4 meters has no fixed equipment, and all the pressure is gathered on three pieces of glue......
Newtonian mechanics is good, the essence is good mathematics, the ruler is long, and the inch is short.
Before I clicked in, I thought it was for you to origami airplanes, and calculate the score according to the farthest distance or time of the flight.