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3 marksReflection

CSEC Physics · 1992 · Paper 2 · Question 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 is used.

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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(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…[3 marks]
  4. 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]

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