Health · 6 min
The WHR ratio is the ratio of waist to hip circumference. We explain the formula, norms for women and men and a calculation example. Body shape and risk.
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Sport · 6 min
How many calories does running burn? A formula based on body weight and distance, the effect of pace and a 10 km example. Check the real values.
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Health · 7 min
What is BMR and how to calculate it? The Mifflin-St Jeor formula, factors affecting basal metabolism and a step-by-step calculation example.
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Science · 6 min
Ohm's law in practice: the formula U = I × R, how to find voltage, current and resistance. Worked numerical example in SI units plus power formulas.
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Science · 6 min
How to calculate the density of a substance: the formula ρ = m / V, SI units, converting kg/m³ to g/cm³, and a step-by-step numerical example.
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Science · 6 min
How to calculate the molar concentration of a solution: the formula c = n / V, finding moles from mass, the unit mol/dm³, and a worked example with salt.
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Science · 6 min
How to calculate the pH of a solution from the hydrogen ion concentration: the formula pH = -log[H⁺], the pH scale, acids and bases, and a worked example.
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Science · 6 min
The kinetic energy of a body: the formula Ek = ½mv², the unit joule, the effect of mass and speed, and a step-by-step numerical example in SI units.
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Science · 6 min
Newton's second law of motion: the formula F = m × a, the unit newton, how to calculate force, mass and acceleration, and a worked example in SI units.
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Science · 6 min
How to calculate pressure: the formula p = F / S, the unit pascal, the effect of force and area on pressure, and a step-by-step numerical example in SI.
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Science · 6 min
How to calculate average speed: the formula v = s / t, the units m/s and km/h, unit conversion, and a numerical example with distance and time.
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Science · 6 min
Formulas for the area and perimeter of a square, rectangle, triangle and circle. Units, the difference between area and perimeter, and step-by-step examples.
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