2- At an altitude of 200 km, the downward force of gravity on an Earth satellite

Question

2- At an altitude of 200 km, the downward force of gravity on an Earth satellite (compared to the force on the surface of the Earth): the same a little bit weaker a lot weaker a little bit stronger a lot stronger 3- Molecular motion stops at –272 C 0C –273 F –32C 4- An airplane can detect buried oil or water in the ground from: its radioactivity its emitted plasma its weaker gravity its effect on air resistance 5- Which of the following has the lowest orbit? weather satellite spy satellite GPS TV satellite

Explanation / Answer

2. acceleration due to gravity is given by
   g = GM/(R + h)^2
   where h is altitude from the surface of earth
   so,
   dg/dh = -2*GM/(R + h)

   so, downforce at h = 200 km is a bit weaker than at the surface of the earth

3. Molecular motion stops at absolute zero
   -. hence at -272 C

4. airplanes can detedct oil buried in the land by measuring the weaker greavitational fields in air unsing sensitive equipment

5. The lowest orbit is followed by weather satellites as they need to be closer to the surface to get visual pictures of the earth

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