If I am reading your post correctly you have correctly solved the first three parts of the question and you are stuck on part (d) to find the volume between the plates of the capacitor.

You know the area of the plates as found in part (a) so now you need to calculate the separation of the plates to be able to find the volume. Try to find an equation in your notes or you textbook that relates capacitace, area of the plates, and distance between the plates. If you are still stuck after this reply to this post again and we can dig a little deeper into this problem.

Greetings,

I see you have a question about the 2-D motion of a satellite. When thinking about 2-D motion, it is best to start by writing down the components of the acceleration during the motion and anything we know about the components of the velocity and displacement at the initial and final points of the motion that we are considering. Drawing a little picture of the motion is also good at the start of a problem so that we can visualize what is happening more clearly. Once we have a good idea of what we have been told about the motion, we can use our 2-D kinematic equations to try to figure out the parts of the motion that we weren't told about. Remember, the 2-D kinematic equations can be used just like the 1-D kinematic equations but it is important to treat the x-components and the y-components separately.

After trying that, are there any specific places where you are stuck with this problem or things that you don't understand about it?

Hi there. This is a basic electrostatic problem. Take a look at this video, I hope it will help you.

I think this will be helpful to you. Let me know if you have further questions.

Hello there. This problem is an example of a statics problem since at each instance the arm and ball are not moving. Take a look at this video, which helps determine a force in a statics situation.

In the other situation, you must be careful with the cross product since the angle between the r vector and F vector is not 90 degrees anymore.

Do you have any other questions?

Try watching these two videos I have made to help with your question. In the first video, I cover the derivation of the first and most general expression for power: P = IV.

In the second video, I derive the expressions for power delivered to an Ohmic device. Starting with P = IV, I derive the other expressions using Ohm's Law V = IR. At the end, I highlight when to use each equation.

Hopefully these videos help. Please ask any questions you have regarding any inclarities you may have.

This is another video for a charge on a discharging capacitor. Let me know if you have any other questions.