Throw a stone across the water and see how many times it skips (跳) .Have you played this game before? The more times the stone skips,the more cheers you will get. But do you know the secret behind its success?

   With the help of high-speed cameras,scientists at Brigham Young University in the US have found out the secret skills of stone skipping.

   The first step is to choose the right stone. " Use flat round stones (disc-shaped stones) , and find a weight that allows you to put a lot of spin on them," Tadd Truscott,an assistant professor,told The Huffington Post. Discs are usually easier to skip than rounded stones.

   Then,here comes the key part: find the right angle. According to the Guinness World Records,the world record for stone skipping is 88 skips set in 2013 by an American called Kurt Steiner.

   Professor Truscott said the skill depends on what angle the thrower chooses to throw a stone at. The best angle for discshaped stones is close to 20 degrees (度) . But the heavier the stone is,the flatter this angle should be.

   If you find 20 degrees hard to measure,you can try another way. Give a great deal of backspin (下旋) to a rounded stone,so it will go under the water and then pop up and out of the water.

    "To make it,you need to throw the stone at a much higher angle than for the usual skipping,M Truscott said to The Huffington Post.

71. What is the article mainly about?

It is mainly about.

72. How did scientists find out the secret skills of stone skipping?

They found out them.

73. What are the secret skills?

They are.

74. Who is Kurt Steiner according to the article?

He is an American who set in 2013.

75. What is the best angle for disc-shaped stones?

The best angle is.

 0  102597  102605  102611  102615  102621  102623  102627  102633  102635  102641  102647  102651  102653  102657  102663  102665  102671  102675  102677  102681  102683  102687  102689  102691  102692  102693  102695  102696  102697  102699  102701  102705  102707  102711  102713  102717  102723  102725  102731  102735  102737  102741  102747  102753  102755  102761  102765  102767  102773  102777  102783  102791  159627 

违法和不良信息举报电话:027-86699610 举报邮箱:58377363@163.com

精英家教网