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Does iron float? Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

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What a question? Throw a carnation, a screw, a ball from a bearing into the water - they will all immediately drown. A square cut out of tin from a tin can will also go to the bottom. It floats no better than an ax or an iron.

But try to bend the same square into a box. Look, it floats! Now you can put a carnation, a screw, and a ball in this box, it will only sink deeper, but it will not go to the bottom. And in a large iron box, an ax with an iron will be able to travel on water. Steel ships with steel guns, steel machines, steel anchors on heavy steel chains are sailing on the sea!

Does iron float?

Of course, you understand why this is so. Steel ships have air. It takes up a lot of space. Like a giant swim bladder! If you let water in instead of air, the ship will immediately sink. You can make a "shipwreck" with your tin box. Punch its bottom with a nail, and you will see how the ship that has received a hole sinks!

Author: Galpershtein L.Ya.

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Linear regulator TPS7A45 16.12.2015

The powerful TPS7A45 linear regulator from Texas Instruments is optimized to handle rapidly changing loads. This LDO is capable of providing a maximum load current of up to 1.5 A with a minimum input-output voltage drop of about 350 mV.

TPS7A45 has minimal intrinsic noise and can be used to power sensitive circuits of radio paths and radio modules.

The TPS7A45 controller's own consumption is 1 mA or less. To turn off the microcircuit, there is an additional shutdown input, when activated, the consumption is reduced to 1 μA.

The output voltage level can be in the range of 1,2...20 V. The specific value of the output voltage is adjusted using a resistive divider (for the adjustable version) or by selecting a chip with a fixed output voltage.

The TPS7A45 includes reverse polarity protection (input) and reverse current protection (output).

The TPS7A45 is available in two package types: SOT-223 (6) and TO-263 (5). This chip will find its application in industrial devices, wireless networks and radio frequency systems.

The main parameters:

Maximum output current: 1,5A;
Regulation error: <1% (25°С);
Rated voltage drop: 300mV;
Noise: <35 μV (10 Hz...100 kHz);
Ripple suppression ratio: 68 dB;
Own consumption: <1 mA;
Output voltage range: 1,5V, 1,8V, 2,5V, 3,3V or adjustable version;
Own consumption in Shutdown mode: <1 μA;
Work with a ceramic capacitor at the output;
Input protection against reverse polarity supply;
Reverse current output protection;
Output overcurrent protection;
Thermal protection.

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