At a Given Point Above Earth's Surface, the Acceleration Due $7.8 \mathrm {~m} / \mathrm { s } ^ { 2 }$

question 22

Multiple Choice

At a given point above Earth's surface, the acceleration due to gravity is equal to $7.8 \mathrm {~m} / \mathrm { s } ^ { 2 }$ What is the altitude of this point above Earth's surface? (G = 6.67 × 10^-11 N ? m²/kg², M_earth = 5.97 × 10²⁴ kg, R_earth = 6.38 × 10⁶ m)

• A)770 km
• B)970 km
• C)1500 km
• D)2000 km
• E)2400 km