Physics Calculators (Page 23)
Velocity, mechanics, energy, electricity and physics tools.
Physical Pendulum Calculator
Enter moment of inertia, mass, gravity and pivot distance to compute the period of a physical (rigid-body) pendulum.
Torsion Pendulum Calculator
Enter moment of inertia I and torsion constant κ to compute period T=2π√(I/κ), frequency f and angular frequency ω. I=1 kg·m², κ=1 → T≈6.283 s; watch hairspring I=1e-7, κ=1e-5 → T≈0.628 s (1.59 Hz).
Standing Wave Calculator
Enter wave speed, length and harmonic number to compute standing-wave frequencies f_n=nv/(2L) and wavelengths λ_n=2L/n. v=340, L=1 → f₁=170 Hz, f₂=340 Hz; guitar v=5000, L=0.65 → f₁≈3846 Hz.
Thin-Film Interference Calculator
Enter refractive index, wavelength and order to compute constructive thickness t=mλ/(2n) and destructive t=(m+½)λ/(2n). n=1.5, λ=500 nm, m=1 → t_c≈166.7 nm; anti-reflective MgF₂ t≈100 nm.
Carbon Dating Calculator
Compute the age of a sample from its remaining ¹⁴C fraction.
Coulomb Potential Energy Calculator
Compute electrostatic potential energy U = kq₁q₂/r.
Stefan-Boltzmann Law Calculator
Enter emissivity, surface area and temperature to compute blackbody radiated power. Human body ε=0.97, A=1.5 m², T=310 K → P≈744 W.
Reverberation Time Calculator
Enter room volume and total absorption to compute reverberation time RT60=0.161·V/A. V=100 m³, A=10 m² Sabine → T=1.61 s. Concert halls target 1.8–2.2 s, speech 0.8–1.2 s.
Sound Pressure Level Calculator
Enter RMS sound pressure to compute SPL=20·log₁₀(p/p₀) in dB, sound intensity I=p²/(ρc) and SIL=10·log₁₀(I/I₀). p=0.02 Pa (talk) → 60 dB; p=1 Pa → 94 dB; p=200 Pa (jet) → 140 dB (pain).
Electric Current Density Calculator
Compute current density J = I/A, drift velocity and resistance per length.
Magnetic Dipole Field Calculator
Enter magnetic moment and distance to compute the on-axis and equatorial magnetic field of a dipole B = (μ₀/4π)·m/r³.
Photon Momentum Calculator
Enter frequency or wavelength to compute the photon momentum p = h/λ = E/c (and the equivalent mass).