SuomiKaataa2

The International Space Station orbital speed Let's determine the orbital speed and period for the International Space Station (ISS): ISS orbits about 400 km above the Earth's surface, which means that radius of its orbit is R_E (Earth's radius) + 400 km.  It is easier to determine orbital speed and orbital period of satellite for circular orbits. We have satellite of mass m in a circular orbit about Earth at distance r from center of the Earth. It has centripetal acceleration directed toward the center of the Earth. Earth's gravity is the only force acting, so Newton's second law gives  Gm M E r 2 = m a c = m v 2 orbit r . Which re-arrange into v_orbit = (G M E  / r)^1/2 To find the period of a circular orbit, we note that the satellite travels the circumference of the orbit 2πr in one period T. Using the definition of speed, we have v_orbit=2πr/T, which gives T = 2πr/v_orbit.  Let's calculate orbit speed for ISS.  so, the orbital speed is 767 m/s (compa...

 Weightlessness, or zero gravity Gravity exist everywhere in the universe because it is defined as the force that attract two bodies to each other. The sensation of weightlessness or zero gravity happens when the effect of gravity is not felt. For example, astronauts in the International Space Station (ISS) do not feel the effects. ISS is in perpetual freefall above the Earth. Its forward motion, however, just about equals the speed of its fall toward the Earth. This means that the astronauts inside are not pulled in any particular direction. So they float.  Height above Earth's surface vs weight force of 10 kg object in Newtons. How to calculate g at certain altitude. (6371 km is taken as Earth's diameter.) But anyone who has flown with a small plane can experience weightlessness, for example by sudden push of wind or by a maneuver that you fly as up and turn it down, so you feel weightlessness on top of the rout. Zero G Flight Newton's theory of gravitation Newton describ...