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13 results for “sphere”

Formulae (13)

V = \frac{4}{3}\pi r^3

The volume enclosed by a sphere.

A = 4\pi r^2

The total surface area of a sphere.

V = \frac{\pi h^2}{3}(3R - h)

Volume of a slice cut from a sphere.

F = 6\pi\mu r v

Drag on a small sphere in viscous flow.

r_{ph} = \frac{3GM}{c^2}

Radius where gravity bends light into a circular orbit.

r_H \approx a\left(\frac{m}{3M}\right)^{1/3}

The zone where a body's gravity dominates over its host's.

a = 38.94\sqrt{T}

Local speed of sound (kt) as a function of absolute air temperature (Kelvin).

T = 15 - 1.98\left(\dfrac{h}{1000}\right)

Standard atmosphere temperature decreases about 2°C per 1000 ft up to the tropopause.

DA = PA + 120(OAT - ISA)

Pressure altitude corrected for temperature.

P = P_0 e^{-\frac{Mgh}{RT}}

Atmospheric pressure as a function of altitude.

f_1 \approx \frac{c}{2\pi R_E}

Fundamental electromagnetic resonance of the Earth.

\text{Pa} = \text{atm} \times 101325

Convert atmospheres to pascals.

Pa = atm \times 101325

Convert atmospheres to pascals.