Experience with the center of gravity of the human body. Fun physical experience at home

ENTERTAINING EXPERIENCES AT HOME
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Experience with the center of gravity of the human body. Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

There are things we never think about. For example, over how we get up from a chair. But it turns out that in order to get up from a chair, one condition must be met. What this condition is, will be said later, but for now let's do this experiment.

Sit on a chair. Place your feet upright without slipping them under the seat. Sit completely straight. Try to stand up without leaning forward, without stretching your arms forward, and without sliding your legs under the seat. You won't succeed - you won't be able to get up. Your center of gravity, which is somewhere in the middle of your body, will not let you stand up.

What condition must be met in order to get up? It is necessary to lean forward or tuck your legs under the seat. When we get up, we always do both. In this case, the vertical line passing through your center of gravity must necessarily pass through at least one of the feet of your legs or between them. Then the balance of your body will be stable enough, you can easily stand up.

Well, now try to stand up, picking up dumbbells or an iron. Stretch your arms forward. You may be able to stand up without bending over or bending your legs under you.

Author: Rabiza F.V.

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The DPS422 from Infineon is a digital barometric pressure sensor with a built-in precision temperature meter. Pressure measurement is carried out using a capacitive sensor, which guarantees high accuracy over a wide range of operating temperatures. With a miniature 2,0x2,5x0,73mm package and low power consumption of 1,7uA, the new DPS422 is ideal for battery-powered miniature IoT devices.

Measurement of pressure and temperature takes place using a 24-bit ADC. Measurement results can be obtained via the I2C or SPI interface, and if necessary, you can use separate interrupt lines and an internal FIFO buffer for 32 values. Each sensor is calibrated during production. The individual spread is stored as fixed correction factors, which are available through internal registers.

Features of DPS422:

miniature package 8-pin LGA, 2,0x2,5x0,73 mm (typ.);
operating range: pressure: 300...1200 hPa, temperature: -40...85°C;
resolution: +- 0,005 hPa (or +-5 cm);
relative accuracy: +-0,06 hPa (or +-50 cm);
absolute accuracy: +- 1 hPa (or +-8 m);
temperature measurement accuracy: +- 0,4°C;
measurement dependence on temperature: < 0,5Pa/K;
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average consumption: 1,7 µA for pressure, 2 µA for temperature;
power supply: VDDIO: 1,2...3,6 V, VDD: 1,7...3,6 V;
operating modes: on demand, automatic, sleep;
individual factory calibration with preservation of corr. coefficient;
FIFO: saving up to 32 measurement results;
interface: I2C with interrupts, 4-lanes SPI, 3-lanes SPI with interrupts.

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