# Math

posted by .

"during the opening sequences of " the day the earth stood still " the alein craft orbits the earth at 6437.376 kph. If the spaceship is flying 1.25km above the surface area of the earth , a) find the distances travelled to make a single orbit of the earth . b) the time it takes to complete one of those orbits ."

• Math -

You will need the Earth's radius, re, which you should look up. It is about 6400 km. Call that Re.

The radius of the orbit, from the center of the Earth, is
R = Re + 1.25 km.

(a) The circumference of the orbit is
C = 2 pi (R + Re)

(b) The time to complete an orbit is C/6437 km/h

If you get several hours for the orbiting time, the assumptions in the movie are wrong. It would actually take about 84 minutes.

At 1.25 km above the earth's surface, the spacecraft is going to bump into some low mountains. It would also burn up in the atmosphere, travelling at that speed.

## Similar Questions

1. ### Physics

Consider a spaceship located on the Earth-Moon center line (i.e. a line that intersects the centers of both bodies) such that, at that point, the tugs on the spaceship from each celestial body exactly cancel, leaving the craft literally …
2. ### Physics

I still cannot solve this problem: Consider a spaceship located on the Earth-Moon center line (i.e. a line that intersects the centers of both bodies) such that, at that point, the tugs on the spaceship from each celestial body exactly …
3. ### physics

still cant get this one? so damon i know you wanna help! or anyone else im open for suggestions haha Consider a spaceship located on the Earth-Moon center line (i.e. a line that intersects the centers of both bodies) such that, at
4. ### 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?
5. ### 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?
6. ### gravity

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?
7. ### physics

a satellite orbits the earth at an altitude of 5000 m above the surface of the earth. Assuming that acceleration due to gravity is still 9.8 m/s/s, find the time for 1 revolution.
8. ### Math

The radius of Earth is 3,959 miles. A spacecraft orbits 6 miles above the surface of Earth. The spacecraft completes 220° of a revolution around Earth in one day. What is the average speed of the spacecraft?
9. ### physics

A geosynchronous Earth satellite is one that has an orbital period equal to the rotational period of the Earth. Such orbits are useful for communication and weather observation because the satellite remains above the same point on …
10. ### science

A spaceship of mass 2000kg is moving towards planet Earth. Calculate the magnitude of the force that the earth exerts on the spaceship when the spaceship is 100km above the surface of the Earth. The Earth has a mass of 6*10 to the …

More Similar Questions