20 APPENDIX: PHYSICAL UNITS
might be in terms of “m/sˆ2” or meters per second squared. This could also be expressed
as“m/s/s”. Units of Newton-meters (for torque) would be entered as “N*m”. Parentheses
may be used to guarantee the correct sense of the unit. Kilometers per Ampere-hour could
be written as “km/(A*hr)” or “km/A/hr” but not “km/A*hr”. The last option would be
interpreted as kilometer times hours per Ampere.
LON-CAPA will automatically perform some conversions between units of the same di-
mension when units are provided for a problem. You can provide an answer of “1.45 km”
for a distance. If the computer expects the answer in cm, it will convert your answer before
comparing against the numerical solution.
Please note that if your units are inappropriate, the computer has no way of checking
the appropriateness of your answer. If units are required, only once appropriate units are
provided will the system check your numerical answer.
# electric current
# thermodynamic temperature
# amount of substance
# luminous intensity
# log of pressure amplitude