Science
Physics, chemistry and astronomy worked out with the exact defined constants — standard gravity, the Planck constant, the speed of light, the gas constant — and every answer given in both SI and US customary units.
3 herramientas 23 calculadoras adentro
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Six chemistry and thermodynamics problems in one page: C1V1 = C2V2 dilutions, moles from mass and molar mass, pOH to pH, PV = nRT for any unknown, Carnot efficiency between two temperatures and the entropy change of a phase transition — with the exact 2019 SI constants.
6 calculadoras How far, how fast, how much energy?How far, how fast and how much energy: Doppler shift of a passing siren, photon energy from wavelength, star distance from parallax, recession velocity from redshift, your weight on other planets, radioactive decay, earthquake energy from magnitude and the radiative forcing of CO₂.
8 calculadoras What’s the force, energy or motion here?Nine mechanics problems in one place: free-fall distance and impact speed, kinetic and potential energy, mechanical work at an angle, friction force, Hooke’s law springs, angular momentum, pendulum period and buoyancy — with exact constants and results in both SI and US units.
9 calculadorasSection guide
Physics, chemistry and astronomy worked out with the exact defined constants — standard gravity, the Planck constant, the speed of light, the gas constant — and every answer given in both SI and US customary units.
Pick your calculation. Only the fields it needs are read — leave the rest alone.
Datos para la cuenta: In the dilution, what are you looking for?, C₁ — stock concentration, V₁ — volume of stock.
Referencia: NIST / CODATA.
Pick your question. Only the fields that case needs are read — everything else is ignored.
Datos para la cuenta: Source frequency, Speed of the source, Speed of the listener.
Referencia: NIST / CODATA.
Pick the situation. Only the fields that case needs are read — everything else is ignored, so you can leave the rest at their defaults.
Datos para la cuenta: Time falling, Mass, Speed.
Referencia: NIST / CODATA.
Editorial transparency
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Editorial inventory
These figures aggregate the decisions, variables and sources in the included hubs. The analysis is rebuilt from Hacé Cuentas’ official inventory.
Hacé Cuentas’ “Science” collection brings together 3 hubs and routes, 49 modelled variables and 17 declared sources.
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