general physics
posted by justin .
His spacecraft, Vostok I, was a sphere about 2.3 m in diameter, and it reached a maximum altitude above Earth’s surface of 327 km. What was the spacecraft’s speed at this point in its orbit?

the gravitational constant G =6.67•10⁻¹¹ N•m²/kg²,
Earth’s mass is M = 5.97•10²⁴kg,
Earth’s radius is R = 6.378•10⁶ m.
r=R+h =6.378•10⁶ +0.327•10⁶ =...
ma=F
F =G•m•M/r²
ma=mv²/r
G•m•M/r² =mv²/r
v=sqrt(GM/r)=...