CAIE IGCSE Physics 6.1.1 The Earth Questions

Covered syllabus points

[Maximum number: 3]

(a)

State the equation that defines the average orbital speed v of a planet. State the meaning of any symbols you use.

[ 2 ]

$v=2 \pi r / T$
r= (average) radius of the orbit AND T= (orbital) period

(b)

Suggest why countries that are a significant distance from the Equator experience significant temperature variation throughout the year.

[ 1 ]

[Maximum number: 6]

(a)

Fig. 10.1 represents different positions A-H of the Moon as it rotates around the Earth.

Fig. 10.1

[ 3 ]

(i)

State a position of the Moon where an observer on Earth sees:
1. there is a quarter Moon
2. there is a full Moon

[ 2 ]

(ii)

State the approximate time taken for the Moon to orbit the Earth.

time =..........................................................

[ 1 ]

(b)

The average distance of the Earth from the Sun is $1.5 \times 10^{8} \mathrm{~km}$ .

[ 3 ]

(i)

Calculate the average orbital speed of the Earth in km / h.
average orbital speed = km/h [3]

[ 3 ]

$110000(\mathrm{~km} / \mathrm{h})$ $(v=) 2 \pi \mathrm{r} / T$ $T=365 \times 24 \mathrm{~h}$ OR $2 \pi \times 1.5 \times 10^{8} / 365 \times 24$

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