Foot per Hour to Cosmic Velocity - Third
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How to Convert Foot per Hour to Cosmic Velocity - Third
To ft/s: ÷ 3,600. To mph: ÷ 5,280. To m/s: × 0.000085.
1 ft/h = 0.000085 m/s = 0.0003048 km/h = 0.3048 m/h.
For example, 1 Foot per Hour (ft/h) = 5.069860e-9 Cosmic Velocity - Third (v₃).
Foot per Hour to Cosmic Velocity - Third — Common Values
| Foot per Hour (ft/h) | Cosmic Velocity - Third (v₃) |
|---|---|
| 0.1 | 5.069860e-10 |
| 0.5 | 2.534930e-9 |
| 1 | 5.069860e-9 |
| 2 | 1.013972e-8 |
| 5 | 2.534930e-8 |
| 10 | 5.069860e-8 |
| 25 | 1.267465e-7 |
| 50 | 2.534930e-7 |
| 100 | 5.069860e-7 |
| 500 | 0.00000253493014 |
| 1000 | 0.00000506986028 |
About Foot per Hour (ft/h)
Foot per hour measures distance in feet traveled over one hour. Used for very slow movements in imperial units.
1 ft/h = 0.000085 m/s = 0.0003048 km/h = 0.3048 m/h.
To ft/s: ÷ 3,600. To mph: ÷ 5,280. To m/s: × 0.000085.
Glacier movement in US studies, very slow industrial processes, and some geological measurements.
Some glaciers move at 50–500 ft/h. Very slow conveyor systems might use this unit.
Confusing with ft/min (60× faster) or ft/s (3,600× faster).
5,280 ft/h = 1 mph. Extremely slow. Rarely used outside specialized contexts.
About Cosmic Velocity - Third (v₃)
The third cosmic velocity is approximately 16,700 m/s (16.7 km/s), the minimum speed to escape the Sun's gravity from Earth's orbital position.
v₃ = √(v_sun² - v_Earth²) where v_sun is solar escape velocity from Earth's orbit. Approximately 16.7 km/s relative to Earth.
To km/h: × 3,600. To mph: × 37,282. 16.7 km/s = 60,120 km/h = 37,344 mph.
Voyager missions, future interstellar probes, and calculations for leaving the solar system.
Voyager 1: ~17 km/s relative to Sun (achieved via Jupiter gravity assist). Parker Solar Probe: 163 km/s peak (but toward Sun, not away).
Thinking Voyager was launched at 16.7 km/s — it used gravity assists. Also, confusing with speed needed to escape from Sun's surface (618 km/s).
~17 km/s to leave the solar system from Earth's orbit. Voyagers achieved this with gravity assists from planets.
