Describe two key differences between the orbital path of a comet and the orbital path of a planet.
An astronaut drops a camera on the Moon.
State the equation linking gravitational potential energy, mass, gravitational field strength (ggg), and height.
The gravitational field strength (ggg) on the Moon is 1.6 N/kg. The mass of the camera is 650 grams650 \text{ grams}650 grams. The camera loses 1.25 J of gravitational potential energy when dropped.
Show that the camera falls through a height of approximately 1.2 m.
The astronaut retrieves the camera and lifts it back to its initial height. State the minimum work done in lifting the camera.
Explain why the astronaut would need to perform more work to lift the same camera through the exact same height on the surface of the Earth.
A climate-monitoring satellite is in a stable circular orbit around Venus.
The satellite orbits Venus with an orbital radius of 8200 km and has an orbital speed of 5.95 km/s.
Calculate the number of complete orbits the satellite completes in one 24-hour Earth day.