pure sky

"If the bamboo strips are extended to the right in an arc, the bookshelves will still be in the way."

Enomoto said so, but still inserted the bamboo stick into the hole in an arc to the right.Junko saw the bamboo sticks coming in from the room, and after less than half a meter, she met the bookshelf again.Moreover, because the bamboo strip is curved, it is farther away from the edge of the bookshelf this time. Enomoto changed the direction of the bamboo strip several times, and it is at least ten centimeters away from the edge of the bookshelf.

Junko looked at Enomoto through the window with some puzzlement.

"...Therefore, the bamboo strips must be inserted in the opposite direction, that is, in a state of arcing to the left."

While talking, Enomoto pulled back the bamboo stick, then adjusted it to the opposite direction, and stretched it in again.This time, before the bamboo sticks met the bookshelves, they were bent and cleverly avoided the bookshelves.

"However, if the bamboo sticks are inserted in this way, the bamboo sticks cannot reach the desk. Therefore, after the bamboo sticks are stretched to a certain length, the bamboo sticks must be adjusted to the opposite direction."

While talking, Enomoto turned the bamboo stick, and the bamboo stick returned to the state of arcing to the right again.

"Next, let's try to use bamboo strips to reach the desk drawers. Lawyer Qingtou, please give me some guidance inside."

"Okay." Junko nodded.

Enomoto began to move the bamboo sticks.

"A little to the left! A little more!"

Junko directed Enomoto outside while paying attention to the position of the bamboo stick.

"Okay! Right here, stop." Junko watched the bamboo stick stop, turned around and said to Enomoto outside the window, "Enomoto-san, the bamboo stick is right under the drawer now."

"Well, I see." Enomoto nodded, "Lawyer Aoto, please open the drawer, I'll try to lift the bamboo."

"it is good."

Junko opened the drawer in response.Not too wide open, just half open, like in that picture.

Enomoto began to lift the bamboo stick.

Junko watched the bamboo strips being lifted up little by little and approaching the drawer little by little, feeling extremely nervous, and watched with bated breath.

However, the bamboo stick stopped abruptly in mid-air.

Junko was taken aback, and asked Enomoto outside the window: "Enomoto-san, what's wrong?"

Enomoto didn't answer, but asked, "Where is the bamboo stick?"

Junko glanced at it and replied, "Get close to the lower edge of the drawer."

Enomoto sighed, put down the bamboo stick, and said softly, "Sure enough, it still doesn't work."

Junko didn't understand what was going on, and asked, "What's wrong? Why doesn't Enomoto-san continue? It's almost time to reach the drawer."

Enomoto shook his head: "It's not that I don't want to continue, it's that the size of the hole is limited, and the bamboo can only be lifted up to this position."

"Eh?" Junko couldn't help but feel a little disappointed. Thinking of Enomoto's sentence "It really doesn't work", she asked again, "Did Enomoto-san predict this situation before?"

"Yes. Measure the diameter of the hole and the thickness of the wall, and the angle at which the bamboo strips can be lifted can be easily calculated, and then compared with the angle required for the bamboo strips to reach the desk, you can know. I still hope that I calculated It was wrong, so I tried it on the spot again, and it was exactly as predicted.”

Junko sighed, extremely disappointed.

"Actually, even if it wasn't restricted by the entrance of the cave, I'm afraid the bamboo sticks couldn't be raised any higher."

"why?"

"According to previous calculations and the actual situation, the straight-line distance between the hole and the desk drawer is at least four meters. Now that the bow-shaped bamboo strips are used, the length of the bamboo strips must be more than four meters. From the perspective of the principle of leverage, in Outdoors, it is very difficult to lift such a long bamboo stick. If the hole is higher than the desk, it would be easier to lift the bamboo stick, but now that the hole is close to the ground, it is difficult to use all my strength when squatting here. Judging from the personal experience of the experiment just now, it really takes a lot of effort just to lift the bamboo sticks to this height."

Junko nodded in amazement.

"Of course, if the bamboo sticks left outside the hole are long enough, according to the principle of leverage, there will be no problem of strength."

"Could the murderer just use a long enough bamboo outside to lift the indoor one?"

Enomoto shook his head: "No. For one thing, if the indoor bamboo sticks are raised, the outdoor bamboo sticks will fall, but the opening of the hole is close to the ground, so the outdoor bamboo sticks cannot fall too much. Second, lawyer Aoto, don't forget Yes, the entrance of the cave is still restricted and cannot be raised.”

Junko sighed in disappointment.

"Also, aside from all these obstacles, even if the bamboo strips can reach the drawer, it is still relatively difficult to put the key in."

Junko was taken aback: "Why?"

"Using the top of the bamboo stick to pick up the key is an unstable method. If you don't pay attention in the middle, the key may fall off. Moreover, if you use a bow-shaped bamboo stick, you must turn the bamboo stick to adjust the direction. It can be said that, It is very difficult to keep the key from falling off. If you don’t pay attention to it, all previous efforts will be wasted. There is another reason. The reason why I was able to manipulate the bamboo stick to the predetermined position just now is because of the command of lawyer Qingto. At the entrance of the hole, you can’t see the situation in the room at all. But the murderer has no one to guide him. If he wants to reach the drawer accurately, it may be difficult to rely on feeling alone. Moreover, the bamboo strips are bow-shaped, and the direction is difficult to control. "

Junko frowned slightly and listened thoughtfully.

"That is to say, the way the murderer created the secret room couldn't be to use bamboo strips?"

"Ah."

Enomoto nodded as a matter of course, Junko couldn't help being a little speechless.Since Enomoto knew it was impossible in advance, why did this experiment make her happy for nothing.

"In addition, there is another reason why the murderer couldn't use the bamboo strips. If the bamboo strips can really successfully arrange the secret room, then after the murderer puts the key in the drawer, he should manipulate the bamboo strips to push the drawer and close the drawer. With the murderer's personality, This should never be forgotten.”

Junko nodded, and after a while, asked again: "Then Enomoto-san, besides using bamboo sticks, do you have other ways to make secret rooms?"

Enomoto was silent for a moment, then Fang said, "There is another way."

The author has something to say: the red line in the picture represents the bamboo strips.

In this picture, it extends in an arc to the right, and the dotted line represents the position where the bamboo strips should be inserted if there is no bookshelf blocking it.

As can be seen in the picture, the bamboo strips are blocked by the bookshelves and cannot be inserted.

In this picture, the bow-shaped bamboo sticks protrude in the direction of the arc to the left.The bamboo strips will cleverly avoid the bookshelves.

In this picture, the bamboo strips are adjusted to the opposite direction, that is, to the left in an arc.The tops of the bamboo sticks fit right around the desk.

Regarding what Enomoto said, "Measure the diameter of the hole and the thickness of the wall, and you can easily calculate the angle at which the bamboo can be lifted, and then compare it with the angle at which the bamboo can reach the desk."

Forgive Xiaoheng, Xiaoheng was going to write down the specific degrees, but he was helpless. Knowing the two sides of a right triangle, how to find the angle of the acute angle, using tan, cot, sin, cos? ?I really can't remember how to ask. . . .

Alas, within a few years of graduation, it was all returned to the teacher! ! !

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