Urgent help, physics HL question

[m.k.2015]

Hey guys, I am really stuck on this question and need urgent help. The question is from chapter 9; Motion in fields (AHL). Please help. Thanks in advance

[ctrls]

For a, you need to use the formula , which is in the data booklet. The Earth's surface is the last point to the left, approximately -6.5x10⁷Jkg^-1. For the second point you you then add 3x10⁷m and take the potential from that point. From there, you just rearrange the formula and substitute in the required values to find the change in GPE.

For b, recall that gravitational potential energy is defined to be the energy required to move a particle from infinity to point P in a gravitational field. In other words, the energy required is equal to the GPE of the satellite (from the surface, if I've understood the question correctly.).

Edited April 23, 2014 by ctrls

[m.k.2015]

For a, you need to use the formula , which is in the data booklet. The Earth's surface is the last point to the left, approximately -6.5x10⁷Jkg^-1. For the second point you you then add 3x10⁷m and take the potential from that point. From there, you just rearrange the formula and substitute in the required values to find the change in GPE.

For b, recall that gravitational potential energy is defined to be the energy required to move a particle from infinity to point P in a gravitational field. In other words, the energy required is equal to the GPE of the satellite (from the surface, if I've understood the question correctly.).

Thanks so much man! both answers were correct ... The teacher gave us the answers but not the method. Thanks again