Tisch
A clever boy rented a house. The family decided to move into the city, so they went to look for a house.
There are three people in the family, two couples and a five-year-old child. They ran all day, until at night, they finally saw an advertisement for serviced apartment.
They hurried to the house, which was unexpected. So, I knocked on the door to ask.
At this time, the gentle landlord came out and looked at the three guests from top to bottom.
The husband summoned up his courage and asked, "Is this house for rent?"
The landlord said regretfully, "Oh, I'm really sorry, but we don't recruit tenants with children in our apartment."
The husband and wife didn't know what to do at the moment and walked away silently.
The five-year-old child saw the whole story from beginning to end. That lovely heart is thinking: Is there really no way out? His little red hand knocked on the landlord's door again.
At this time, the husband and wife have walked out of 5 meters and looked back.
The door opened and the landlord came out again. Children happily say: ...
The landlord laughed and decided to rent the house to them.
Q: What did the 5-year-old child say and finally persuaded the landlord?
Answer:
If parents come forward to solve the problem, there may be three solutions: (1) paying a high price; (2) Begging; (3) Praise your children for being obedient.
None of these three solutions can solve the problem, and a 5-year-old child may not know what lateral thinking is at all. He doesn't know tricks, but his thinking is really good. The focus of children's consideration has shifted from parents to children, thus solving the problem.
What did the child say? The 5-year-old said, "Grandpa, I rented this house. I have no children, I only brought two adults. " The landlord smiled and rented the house to them
extreme
Rotate the egg Put the boiled egg on the table and let it rotate horizontally. If it reaches a certain speed, the egg will stand on its own. Japanese scientists have proved through experiments that an egg can not only stand upright, but also bounce several times in the process. This provides experimental evidence for a theory to explain the paradox of boiled eggs.
The research team of Professor Shimura Yu of Keio University in Japan was published in the online edition of Journal of the Royal Society on June 5438+02.
According to the paper, they developed a device to simulate the high-speed rotation of boiled eggs, which replaced the eggs with an olive-shaped metal ball with a long axis of 6 cm, and then tracked its movement process by analyzing the sound and image of the metal ball falling and the change of copper desktop capacitance.
The simulation experiment shows that when the metal ball rotates at the speed of 25 times per second, it can stand up after starting to rotate 1.2 seconds, and it will bounce 6 times in the process. The jump height is 0. 1 mm, and the air stay time is about 0.02 seconds. Later, the same experiment with eggs also got similar results.
Boiled eggs stand upright in the process of rotation, which seems to violate the physical laws, because its center of gravity rises and the energy of the whole system seems to increase. This problem has puzzled physicists for a long time and is called "boiled egg paradox". In 2002, scientists reported that this phenomenon is actually that part of the rotational energy of cooked eggs is converted into horizontal thrust under the friction between the eggshell and the desktop, which makes the long axis direction of cooked eggs change from horizontal to vertical in a series of shaking shocks.
It is speculated that during the horizontal rotation of an egg, its up-and-down vibration becomes more and more intense. When the acceleration of upward force is equal to the acceleration of gravity, the egg will rebound. The conclusion of this experiment is completely consistent with speculation, which shows that the explanation of the "boiled egg paradox" is credible.
Tisso
How to find whether the six digits □432 1□ are divisible by 432 1 What are these six figures?
Suppose the six digits are 9432 19, then 943219 ÷ 4321= 218 ...1241,because the remainder is greater than 9, it doesn't matter.
Suppose the six digits are 8432 19, then there are 843218 ÷ 4321=195 ... 64, and it doesn't matter if the remainder is greater than 9.
Assuming that the six digits are 7432 19, there are 743218 ÷ 4321=172 ... 7, and the remainder is less than 9, so it can be seen that the qualified six digits are 743129-7 =.
As can be seen from the above analysis, the required six digits can only be 7432 12.