Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange
3 clarifying isolated systems
source | link

In your problem, "earth""Earth" is not aan isolated system. The combined "Sun-Earth" system, buthowever, is, so we can know that the combined sun and earth are. The angular momentum of the Sun-earthEarth system is conserved. As the earth's mass is accelerating the sun, you have to take its angular momentum into account as well.

While the mass and size of the sun mean that we can ignore its motion with respect to the rest of the solar system, you can't do that for your calculation.

Alternatively, you can consider the sun's gravitational force on the earth to be a torque in your case because the force does not go through your reference point.

In your problem, "earth" is not a system, but the combined sun and earth are. The angular momentum of the Sun-earth system is conserved. As the earth's mass is accelerating the sun, you have to take its angular momentum into account as well.

While the mass and size of the sun mean that we can ignore its motion with respect to the rest of the solar system, you can't do that for your calculation.

Alternatively, you can consider the sun's gravitational force on the earth to be a torque in your case because the force does not go through your reference point.

In your problem, "Earth" is not an isolated system. The combined "Sun-Earth" system, however, is, so we can know that the angular momentum of the Sun-Earth system is conserved. As the earth's mass is accelerating the sun, you have to take its angular momentum into account as well.

While the mass and size of the sun mean that we can ignore its motion with respect to the rest of the solar system, you can't do that for your calculation.

Alternatively, you can consider the sun's gravitational force on the earth to be a torque in your case because the force does not go through your reference point.

2 added additional paragraph about torques.
source | link

In your problem, "earth" is not a system, but the combined sun and earth are. The angular momentum of the Sun-earth system is conserved. As the earth's mass is accelerating the sun, you have to take its angular momentum into account as well.

While the mass and size of the sun mean that we can ignore its motion with respect to the rest of the solar system, you can't do that for your calculation.

Alternatively, you can consider the sun's gravitational force on the earth to be a torque in your case because the force does not go through your reference point.

In your problem, "earth" is not a system, but the combined sun and earth are. The angular momentum of the Sun-earth system is conserved. As the earth's mass is accelerating the sun, you have to take its angular momentum into account as well.

While the mass and size of the sun mean that we can ignore its motion with respect to the rest of the solar system, you can't do that for your calculation.

In your problem, "earth" is not a system, but the combined sun and earth are. The angular momentum of the Sun-earth system is conserved. As the earth's mass is accelerating the sun, you have to take its angular momentum into account as well.

While the mass and size of the sun mean that we can ignore its motion with respect to the rest of the solar system, you can't do that for your calculation.

Alternatively, you can consider the sun's gravitational force on the earth to be a torque in your case because the force does not go through your reference point.

1
source | link

In your problem, "earth" is not a system, but the combined sun and earth are. The angular momentum of the Sun-earth system is conserved. As the earth's mass is accelerating the sun, you have to take its angular momentum into account as well.

While the mass and size of the sun mean that we can ignore its motion with respect to the rest of the solar system, you can't do that for your calculation.