Finding output of voltage for certain input voltage diodes

[Questions999]

Homework Statement

We have the circuit in the figure.I have to find the output graphically if the input is Vi=15sinwt.

Homework Equations

This type of exercise doesn't have any equations

The Attempt at a Solution

Heres the circuit
http://i.imgur.com/ivixWzH.jpg
For Vi<= -10 the diode is ON and Vo=10
10<=Vi we have that the diode is OFF and Vi=Vo

My solution is this one : http://i.imgur.com/ZMUB66j.jpg
Is it correct ? How can I find the output numerically in exercises like this?

 

[gneill]

Which part of the sketch represents your solution? Can you describe the behavior (in words) of the diode and cell? When will it conduct?