Thanks.It sounds like you're talking about a half wave rectifier with a 100k resistor hooked up as a load.
The diode will be reverse biased on the negative swing of the sine wave so the voltage across the resistor will be 0 since the diode will stop current flow. When the input voltage is between 0.7V (Forward Diode Voltage assumption) and the maximum of 10V, the voltage across the resistor will be the source - 0.7V.
In your first post, you stated that Vs = 10sin(2pift)Thanks.
So what would the PEAK VOLTAGE be if we ASSUME there is no voltage drop across the diode?