How much energy is in a glass of hot tea? Detailed answer

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How much energy is in a glass of hot tea? Detailed answer

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How much energy is in a glass of hot tea?

When a glass of hot tea (250 grams of water) cools from 100 to 20 degrees Celsius (boiling temperature to room temperature), it loses at least 84 kilojoules of energy (the average specific heat of water in this temperature range is at least 4,2 kilojoules per kilogram-kelvin ).

If this energy is fully converted into electrical energy, it can send out the light of a 25-watt light bulb for an hour. If this energy is fully converted into mechanical work, it will be enough to lift a load of 8540 kilograms to a height of 1 meter (or 854 kilograms to a height of 10 meters).

The hammerer performs the same work, making 400 blows, or a huge 5-ton steam hammer falling from a height of human growth.

Here is an even more striking comparison. The same energy is contained in 38 bullets fired from the barrel of a Kalashnikov light machine gun (7,62 mm RPK, bullet weight 7,9 grams, muzzle velocity 745 meters per second), or 277 bullets fired from the barrel of a Makarov pistol (PM, mass bullets 6,1 grams, muzzle velocity 315 meters per second).

Author: Kondrashov A.P.

Random interesting fact from the Great Encyclopedia:

What household murder weapon is a symbol of power in the countries of Africa, Asia and Oceania?

A fly swatter is not only a useful household item, but also a symbol of power in many countries of Africa, Asia and Oceania. For example, in Thailand, one of the royal regalia is a fly swatter, the handle of which is made of engraved ivory, and the hair is from the tail of an albino elephant. Also, a fly swatter is present on the coat of arms of the territory of American Samoa.

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BMW car will catch the green wave 04.08.2015

BMW and American startup Connected Signals have launched an app for Apple iPhone smartphones that provides real-time traffic information.

The program is called EnLighten and can be downloaded from the App Store website. After connecting the smartphone to the on-board media center, the owner of the BMW car will be able to see on the central display information about traffic signals in the direction of travel. In particular, the current traffic light mode at the nearest intersection and the time before switching are displayed.

The system allows you to determine the optimal speed for driving in the "green wave" based on data from the navigator and information about the current route. It is assumed that this will save fuel, as well as avoid unnecessary acceleration and braking, and therefore save the life of the car.
It is also noted that in the case of intersections with traffic lights equipped with separate sections of the turn signal, the EnLighten application can show the timer only "arrows" when the driver turns on the corresponding turn signal.

The system is currently in operation in Portland and Eugene, Oregon, and Salt Lake City, Utah, where traffic lights are connected to a dedicated communications network. In the future, the geography of the service is planned to expand.

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