如何计算Escape Velocity

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Escape velocity is the minimum speed needed for an object to break free from a celestial body's gravitational pull without further propulsion. For Earth: v_e = √(2GM/R) ≈ 11.2 km/s (40,300 km/h).

分步指南

1. 1Escape velocity: v_e = √(2 × G × M / R)
2. 2G = 6.674 × 10⁻¹¹ N·m²/kg² (gravitational constant)
3. 3M = mass of body · R = radius of body (or distance from centre)

例题解析