The next four posts will have programs for the PCalc iOS app and the HP 50g calculator. English/U.S. Units (feet/miles, pounds, seconds) will be used instead of SI units (meters/kilometers, kilograms, seconds).

The Universal Gravitational Constant is:

SI Units:

G = 6.67384 x 10^-11 m^3/(s^2 kg)

English Units:

G = 1.06904661604 x 10^-9 ft^3/(s^2 lb)

PCalc Program: Escape Velocity (in mi/sec)

5/19/2014

G = 1.06904661604 x 10^-9 ft^3/(s^2 lb)

Input:

Y: mass (in pounds)

X: distance or radius (in miles)

Output:

Y: mass (in pounds)

X: escape velocity (mi/sec)

Program:

Decimal Mode

Multiply X By 5280

Invert X

Multiply X By Y

Multiply X By 2

Multiply X By 1.0690441604e-9

X To Power of 0.5

Divide X By 5280

Example:

Y: 1.3170e25 lbs (Mass of Earth)

X: 3,959 mi (radius of Earth)

Output:

Y: 1.3170e25

X: 6.9512

Escape Velocity: 6.9512 mi/sec

HP 50g: Escape Velocity:

Input:

2: mass in pounds

1: distance in miles

Output:

1: escape velocity in mi/sec

Program ESCVEL

<< 5280 * INV * 2 * 1.0690441604E-9 * √ 5280 / >>

This blog is property of Edward Shore. 2014

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