Moons in this stellar system have different sizes and masses. The bar chart below shows the gravitational field strength of each moon compared to Earth.

Draw on this

Which of these statements is correct?

• A A 1 kg mass would weigh more on Aether than on Zephyr
• B A 1 kg mass would weigh more on Zephyr than on Boreas
• C A 1 kg mass would weigh more on Caelum than on Boreas
• D A 1 kg mass would weigh more on Boreas than on Caelum

On Earth, the gravitational field strength is 9.8 N/kg. Which of these is the value for the gravitational field strength on Zephyr?

• A 0.6 N/kg
• B 5.88 N/kg
• C 9.8 N/kg
• D 16.3 N/kg

A research satellite is in a circular orbit around the moon Boreas. The satellite has an orbital time period of $320minutes$ and an orbital speed of 1850 m/s.

Calculate the orbital radius of this satellite.

Suppose the satellite is currently positioned directly to the right of Boreas (at the 3 o'clock position in its circular orbit). Four direction arrows are defined at the satellite's position:

• Arrow A points vertically upwards
• Arrow B points vertically downwards
• Arrow C points horizontally to the left (directly towards Boreas)
• Arrow D points horizontally to the right (directly away from Boreas)

Which arrow shows the direction of the force of gravity that Boreas exerts on the satellite?

• A Arrow A
• B Arrow B
• C Arrow C
• D Arrow D