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Question 9

Several scientific orbiters currently circle the planet Mars. Table 1 lists orbital data for three of these spacecraft.

OrbiterUseHeight above Mars's surface (km)Speed (km/s)Period (minutes)Revolutions per day (24 hours)
Mars Odysseymapping4003.39117.112.3
MROimaging3003.44112.312.8
MAVENatmospheric study6203.25
a.

Calculate the period of the MAVEN orbiter in minutes.

[radius of Mars=3390 km][\text{radius of Mars} = 3390 \text{ km}][radius of Mars=3390 km]

[3]
b.

Calculate the number of revolutions per day (24 hours) for the MAVEN orbiter.

[2]
Markscheme

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