No big deal...I don't want you to pay unless you get a solid answer or advice....
So, here it is:
The line for that breaker is overloading and/or shorting....More likely overload which means too much power is being drawn on that circuit.
1-You need to have someone locate all the recepticles and lights that are tied to this circuit and proceed to troubleshoot.
2-The way to do that is unplug and shut off everything on that line and turn breaker off.
3-Then turn breaker back on as well as the lights on for that circuit.
4-Then plug in small, low power drawing things in.
5-Then plug in the bigger stuff.
6-See what tripps it.
7-Could be a faulty appliance/electrical equipment or simply too much on that line.
*****If it is too much on the line that causes it to trip....You need to tell the landlord to have an electrician come and run a new line for more recepticles and an additional breaker
*****The electrician may also notice something wrong that I can't physically see too.
Take care, Good Luck!
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Edited by High-Voltage on 1/19/2010 at 1:52 AM EST