Q: Will Physics 101 SE run on an intel Mac?
A: Yes. The program has been recompiled as a universal binary and runs blazingly fast both on PowerPC and Intel Macs.

Q: Where do I enter my serial?
A: After you purchase the program, you are given the full version to download. When you first launch the program, you will be prompted to enter your serial number. The serial is not entered in the demo.

Q: Where can I redownload the program?
A: If you need to redownload the program, you can forward support your email receipt. If you bought Physics 101 SE between 6/10/06-9/10/06 you are eligible to receive the version 6.0 update free. If you purchased before 6/10/06, you will receive the 5.1.2 update.

Q: I cant enter data after tabbing, how do I fix this?
A: This appears to be an issue if you have Keyboard shortcuts enabled in Mac OS 10.3 (System Preferences>Keyboard>Keyboard Shortcuts), simply uncheck it to resolve the problem.

Q: How do I enter scientific notation in?
A: The "x 10^n" part is simply replaced by "e," so instead of entering in an enourmous number like 5,980,000,000,000,000,000,000,000 you can enter in 5.98e24.

Q: How do I find a variable in a formula?
A: Enter in all of the values except for the one that you want to find, then click the radial button next to the unknown value.

Q: The formula gave a result of zero, what gives?
A: If the result is too small and rounding is enabled, the program simply rounds it to zero. To see the result, no matter how small it is go to preferences and select no rounding.

Q: The resistor calculator isnt working, I have defined all the bands, but its not giving a value?
A: You must select a tolerance for it to calculate a value, be it none, silver, or gold.

Q: How do I use the Unit converter?
A: Put the unit you desire to have converted into the empty editfield and select the type of unit it is, when you do this you will see it converted into analogous units. For example, say you want to convert 35,000 seconds into hours, put 35,000 into the editfield and select seconds, you will see the conversion to hours in the list.

Q: What does NAN(000) or INF mean?
A: NAN stands for "not a number" which means you entered in non-appropiate values for the formula, and INF means "infinity"

Q: I know I'm right, but why is this formula is producing different results?
A: We may have goofed. Please email us with the values you used and which formula or feature is in error.

Q: Do you plan to make the window size compatiable with 800x600?
A: Unfortunately, no. It would require an extensive amount of work and the interface would squashed too much.

Circuit Analysis FAQ 

Q: What is a mesh?
A: A mesh is a minimum number of loops in the circuit. Voltages and resistors are summed around the circuit loop and set equal to zero. With two or more meshes the program solves the linear equations with determinants.
Q: I entered in a few resistors but no currents are being calculated.
A: The program needs the at least one resistor per vertical branch to be defined for the determinant formulas to work. Once the vertical branch resistors are defined, the program will calculate the mesh currents.
Q: Why does it come up as NAN?
A: You probably entered in something that can?t be calculated, like a non-numerical character for one of the resistors or voltages.
Projectile X FAQ