45. A satellite is in a stable circular orbit around Earth, as shown. With the satellite at its current position, the force due to gravity acting on it is in which direction?
Answer: D
The force due to gravity acting on the satellite is directed downwards.
In a stable circular orbit around Earth, the gravitational force acting on the satellite always pulls it towards the center of the Earth, which is downwards relative to the satellite's position.
A) left
The direction "left" is incorrect because gravity does not act horizontally in this context. Gravitational force always acts towards the center of the Earth, which is not to the left of the satellite's position.
B) right
Choosing "right" is also incorrect as gravitational force does not pull in a horizontal direction. The force due to gravity is directed inward, towards the center of the Earth, not towards the right side.
C) up
The option "up" is incorrect because gravity cannot act in the opposite direction of Earth's center. In a satellite's orbit, the gravitational force always acts downwards, not upwards.
D) down
This option is correct because the force due to gravity acting on the satellite is directed towards the center of the Earth, which is below the satellite, hence the direction is down.
Conclusion
The force due to gravity acting on the satellite is definitively directed downwards, as it always pulls objects towards the center of the Earth. All other options fail to recognize the fundamental principle of gravitational force, which is to attract objects towards the center of mass, making "down" the only correct choice.