Hi guys. I do not know artificial satellite revolve around Earth in a circular path or an ellipse path but do we have physics and mathematical proof that artificial satellite revolve around Earth in circular/ellipse path?
Homework Statement
A concave mirror of focal length 10cm in air is put into a beaker containing a liquid up to 7.5cm. Refractive index of the liquid is 1.2. What is the focal length of the mirror inside the beaker?
The Attempt at a Solution
I tried proportion method:
Depth...
A wire has uniform cross sectional and resistance R. Then the wire is pulled so that the length increases by 10%. How to find the new resistance? Assumption: The wire thins uniformly.
Lets say I have a point charge X placed on a region between a +Q test charge and +2Q point charge where electric field strength is zero. Since E=-dV/dR, does it mean V=0 or constant? Can the point charge move if i place it there? Well lets just ignore gravitational field/force here.