Chapter 750 One-Stop Service 8

"Just try it." Zhou Yan smiled, "You will know how difficult it is after you try it! I have practiced for a long time to be able to float six times in a row!"

The girl lowered her head and picked up a stone casually.

Zhou Yan immediately said: "No, no, you can't choose the stone well, you have to choose flat or dish-shaped ones!"

"It's okay, I'll just practice."

"Yimei, be rigorous in everything!" Zhou Yan has a strong sense of variety, and he just pulled the stone out of Xiangyi's hands, leading her to choose carefully, and commented on the stones one by one, "Too big, no; too fat, Neither; too ugly, let alone."

The variety show effect came out all at once.

——[Yan Baoyan's dog is hammered! 】

——[Yan Sansui took Yimei to find stones, it's too cute! 】

——[I laughed until I spiraled into the sky, Yimei is too difficult! It feels like bringing a cub every day, baby Yuyu, little brother Lanlan, and now there is a giant baby Yanbao! 】

…

Finally, Zhou Yan selected a suitable stone, and made a popular science section:

"Yimei, do you know why stones bounce when you float in water? It's actually very simple, the greater the flow velocity, the lower the pressure.

Stones are denser than water, and the water will flow rapidly in a short period of time when floating, so the water surface will exert pressure on the stones.

When the pressure is greater than the weight of the stone, the stone will bounce, and the more times this happens, the more times the stone will bounce across the water. "

Xiangyi agreed: "Well, the principle of fluid mechanics."

Zhou Yan gave a thumbs up: "Smart."

The audience in the live broadcast room were almost dumbfounded.

Wouldn't it be a waste of time?

Why are you still so advanced? !

Xiangyi weighed the stone in his hand, and had to say that Zhou Yan chose it very well, and it felt great in the hand.

The girl pinched the stone with her thumb and middle finger, with her index finger behind her. Seeing her gesture, Zhou Yan called out to the expert, "Hey, expert!"

Xiangyi smiled calmly, and slowly bent down, her posture was elegant and casual. She seemed to have no strength, and moved the stone with her index finger, but the stone was spun with great force, and she threw it out!

"boom!"

"boom!"

"..."

After more than a dozen rings in a row, the stone "plopped" and sank to the bottom of the water!

Zhou Yan:?

audience:?

Is it hallucination? Must be right? !

Xiangyi said "Oh", as if she was not satisfied with the result, she took out a spare stone and threw it again!

The familiar "bang bang" sound dominated everyone again!

This time, it rang twenty-three times!

Zhou Yan was dumbfounded.

Thinking of what he said just now, "Brother, I will teach you", he digs his toes awkwardly at the soles of his shoes, wishing he could jump into the pond on the spot!

This damn... this is unscientific!

The girl gently opened her lips, and her voice was gentle and soft: "There was once a professor who summed up a famous equation based on the weight and speed of the stone and the influence of the air - the equation of floating in water."

Zhou Yan was confused: "Huh?"

The audience was in a daze: [Is Yimei fooling people? yes? ? 】

Xiangyi continued: "This equation is: M x A = P – MG + air influence. M stands for mass, A stands for vertical acceleration, P stands for water surface feedback pressure, and MG stands for gravity.

Through this equation, it has played an important role in the research on the problem of "aircraft icing", and has also been applied in the field of criminal investigation to calculate the splash of blood. "

Zhou Yan:? ? ?

audience:? ? ?

Excuse me, really bother.

Is this science?

I'm sorry, it's in vain, I'm not worthy! !

…

The equations are quoted from the Internet.

good night!