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Edexcel | Physics WPH0 | W 11 5 1 | 1 hour 30 minutes
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15
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The Moon takes 27.3 days to make one complete orbit of the Earth.

15
(a) (I)
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2 Mark s

15
(a) (II)
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4 Mark s

Calculate the radius of the Moon’s orbit.

                                              Radius = .-----------------------

15
(b)
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The Moon is gradually moving further away from the Earth because of the action of

tides.

15
(b) (I)
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2 Mark s

State and explain how this increasing distance affects the moon’s orbital period.

Max two from:

♦ Gravitational force on moon is reduced 

♦ (Therefore) ω or v is decreased 

♦ (Hence) the orbital time increases

15
(b) (II)
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1 Mark

In 200 years the radius of the Moon’s orbit is predicted to increase by 8 m.

Calculate the rate of increase of the radius of the orbit in cm per year.

 

                                                 Rate of increase = . . . . . . . . . . . . . . . . . cm per year

15
(b) (III)
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3 Mark s

In practice, the rate of increase of the orbital radius due to tidal action will not

have been constant. Suggest why this rate of change might have been different

in the very distant past.

(QWC – Work must be clear and organised in a logical manner using

technical wording where appropriate)

Answers based on expanding universe/galaxies/stars do not gain credit

Idea that in the past the moon was closer OR the gravitational pull

would have been larger 

In the past the tidal effects would have been greater/stronger 

The rate of change of orbital radius would have been greater

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