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- Tips and tricks #5: How to show/hide input and output controls in a calculator
This article describes how to control visibility of input and output controls in a calculator

- Acceleration of gravity
Acceleration of gravity calculation on the surface of a planet. It's possible to calculate the acceleration above the surface by setting the sea level. But it won't be possible under thesurface - this is a wrong formula.

- Area de la Sombra de un Objeto
El área de la sombra se refiere a la de un objeto cuadrado o rectangular.

- Barometric leveling
- Calculation of weight by volume
Calculating the weight by the volume of material with matter density reference book

- Calculation of weight by volume
Calculating the weight by the volume of material with matter density reference book

- Clapeyron-Mendeleev equation. The relationship between the number of moles of gas, the temperature, volume and pressure.
Clapeyron-Mendeleev equation. The relationship between the number of moles of gas, the temperature, volume and pressure.

- Complementary color
This calculator shows complementary colors for entered colors

- Coulomb's law
This online calculator calculates unknown (whether force, charge or distance) using known values using Coulomb's law scalar formula. It can be used to solve physics problems.

- Direct observation error analisys
Calculates error of direct measurements for given measured value series and confidence interval.

- Energy measurement units
Energy unit converter (joules, kilowatt-hour, kilogram force per meter, horsepower per hour, kilocalories)

- Free fall. Distance passed task.
Solution of the falling body and distance passed tasks.

- Hydrostatic pressure
This online calculator can solve hydrostatic pressure problems by finding unknown value in hydrostatic equation.

- Kinematics. Throwing body up problem
Kinematics problem from the Svetozarov's book for MEPI matriculates

- Normal force
This online calculator calculates strength of the normal force from the mass of the object, the gravitational field strength and the angle of the inclined surface measured from the horizontal.

- Petroleum product density
Petroleum product density conversion, according to GOST 3900-85

- Quantity of heat
This calculator can find missing values in the relationship between heat and temperature: heat added or removed, specific heat, mass, initial temperature and final temperature

- Space object velocity
It calculates the circular orbital velocity, escape velocity and planetary system escape velocity for the given planet parameters.

- Temperature scales
Conversion between different temperature scales

- The waves and the wind. Calculation of wave characteristics
Calculation of wave characteristics