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3 marksPotential Energy, Ep

CSEC Physics · 1992 · Paper 2 · Question 2(iii)

If the mass of the satellite is 27 kg, what is the gain in gravitational potential energy by the satellite as it is lifted from the earth's surface to its orbital height? (Assume that there is no change in the force of gravity up to this height.)

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  1. 2(i)A student suggests artificial satellites can remain in orbit because they have escaped the earth's gravity. Explain why these satellites would not stay in…[2 marks]
  2. 2(ii)A weather satellite orbits at a height of 800 km above the surface of the earth. Calculate the time taken for radio waves to arrive at the earth's surface…[3 marks]
  3. 2(iv)If the satellite takes 100 minutes to complete one revolution of the earth, calculate its speed and kinetic energy given that the length of its orbit is 4.5 x…[5 marks]
  4. 2(v)The radio signal is received from the satellite by an aerial with a concave parabolic reflector. With the aid of a diagram, explain why a parabolic reflector…[3 marks]

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