# physics

posted by .

for a sateliite to have a speed of 7400 m/s how far must it be in metres above the earth's surface

• physics -

V^2/(re+h)=9.8(re/(re+h))^2
solve for h.

• physics -

M V^2/R = M*g*(Re/R)^2
(due to inverse square falloff in weight with R)

Re is the earth's radius = 6370*10^3 m.
R = Re^2*g/V^2 = 7.262*10^6 m = 7262 km

Distance above Earth = 7262 - 6370 km = 892 km

## Similar Questions

Earth turns on its axis approximately once every 24 hours. The radius of Earth is 6.38 X 10^6 m. a.) If some astronomical catastrophe suddenly brought Earth to a screeching halt (a physical impossibility as far as we know), with what …
2. ### Physics

How far above the surface of the Earth does an object have to be in order for it to have the same weight as it would have on the surface of the Moon?
3. ### Physics

A spaceship is launched from the Earth's surface with a speed v. The radius of the Earth is R. What will its speed be when it is very far from the Earth?
4. ### physics

A 70 kg man weighs 686 N on the Earth's surface. How far above the surface of the Earth would he have to go to "lose" 14% of his body weight?
5. ### physics

What linear speed must an Earth satellite have to be in a circular orbit at an altitude of 208 km above Earth's surface?
6. ### physics

(a) What linear speed must an Earth satellite have to be in a circular orbit at an altitude of 129 km above Earth's surface?
7. ### physics

A 80 kg man weighs 784 N on the Earth's surface. How far above the surface of the Earth would he have to go to "lose" 15% of his body weight?
8. ### Physics

A projectile is fired vertically from Earth's surface with an initial speed v0. Neglecting air drag, how far above the surface of Earth will it go?
9. ### Physics

A man has a mass of 65kg on the Earth's surface. How far above the surface of the Earth would he have to go to "lose" 13% of his body weight?
10. ### Physics

An object is projected from a satellite orbiting 200 km above the surface of the earth. The object has a speed relative to the Earth of 2.85×104 m/s. What is its speed when it is very far from the earth?

More Similar Questions