Page 120 - text book form physics kssm 2020

6. Figure 4 shows the Earth and planet Neptune.
Sun

Orbit of Earth
Orbital period r r 1 1
of Neptune = T Orbital period
2
r of Earth = T 1
2

Orbit of Neptune

Figure 4
(a) Write down the relationship between orbital period and radius of orbit for the Earth
and Neptune.
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(b) Orbital period of the Earth is 365 days and radius of orbit of the Earth is 1.50 × 10 m.
Calculate the radius of orbit of Neptune if its orbital period is 5.98 × 10 days.
4

7. Th e Earth orbits the Sun with radius of orbit of 1.50 × 10 m and orbital period of 1 year.
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Radius of orbit of planet Saturn is 1.43 × 10 m. What is the orbital period of Saturn?
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8. A spacecraft orbits the Earth at a height of 1 600 km. Calculate the escape velocity for
the spacecraft .
–2
24
–11
[G = 6.67 × 10 N m kg , mass of the Earth = 5.97 × 10 kg, radius of the Earth
2
6
= 6.37 × 10 m]
9. Figure 5 shows planet Saturn with rings made up of small particles around it. Planet
Saturn has a mass of 5.68 × 10 kg and radius of 6.03 × 10 m.
7
26

Rings of planet
Saturn

Figure 5
(a) Calculate the escape velocity of planet Saturn.
(b) Discuss the possibility of the small particles in the rings of planet Saturn escaping into
the outer space.

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