Bottlephone. Fun physical experience at home

ENTERTAINING EXPERIENCES AT HOME
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Bottlephone. Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

The word is not very complex. However, if there is a gramophone, a telephone, a tape recorder, if they play saxophones and xylophones, why not call our musical instrument a bottle-phone? Moreover, it is made from bottles. They must be hung in a row, as shown in the figure, and filled with water to different levels, so that when struck, different notes are produced. It is best, of course, to choose a piano scale: seven tones and five semitones. To set up a bottlephone, you will have to invite a person with a good ear for music and provide him with a bucket of water and a funnel.

bottlephone

The bottlephone is played with two sticks. And if you hang bottles in two tiers, you can play with four hands!

Author: Galpershtein L.Ya.

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Speedy robot fish 29.09.2019

Mechanical engineers at the University of Virginia (UVA), along with biologists at Harvard University, have created the first robotic fish, Tunabot, which mimics the speed and movement of a live yellowfin tuna. The development will help in the future to create a new generation of fast underwater vehicles.

Yellowfin tuna belongs to the species of ray-finned fish from the mackerel family of the perch-like order. The maximum length of his body can reach almost 240 centimeters, and weight - 200 kilograms. Fleeing from a predator, this fish can reach speeds of up to 70-75 kilometers per hour. Because of its speed, tuna is popular among sport anglers: not everyone can catch this fish.

Researchers have tried to create an underwater robot that can move at the same speed as a yellowfin tuna. Their Tunabot is much smaller than a real tuna - only 25,5 centimeters in length. However, it can reach a maximum tail beat frequency of 15 hertz, which corresponds to a swimming speed of one meter per second. That is, in a second, the robot can cover a distance four times the length of its body. In general, the range of movement of Tunabot is from 9,1 kilometers if it swims at a speed of 0,4 meters per second, to 4,2 kilometers if it develops a speed of one meter per second, provided that the battery capacity is 10 watt-hours .

"Our goal was not just to build a robot. We really wanted to understand how marine life swims," said Hilary Bart-Smith, professor of mechanical and aerospace engineering at the University of Virginia. "Our goal was to create something that on which we could test hypotheses in terms of what makes biological swimmers so fast."

Underwater robots that mimic the abilities of living organisms will be useful in various fields - for example, in the study of marine resources and the verification of underwater infrastructure.

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