Mac book pro feels hot

Hi. I own a macbook pro and sometimes it feels like the bottom of the computer gets really hot. Is that normal? Usually it happens when I've been on the computer for at least 30 min. or so.

It depends. Some processor intensive activities will generate quite a lot of heat and this would be normal, especially if the fans speed up at the computer heats up. But if the computer gets quite hot under less intensive processes, there could be a problem. For example, if one of the fans were not working, the computer could get hotter than it should. Or if there is a runaway process hogging the CPU, the computer could get hot.
There are a couple of ways to monitor your heat situation. One is to download the widget iStatPro so you can see how hot your computer is and how fast your fans are running. On most MBP's, the fans will idle at around 2000 RPM. (I believe that the idle was around 1000 RPM for earlier models.) With 6 applications open, my fans are at around 2000 RPM and my CPU A is at 45℃. I have the Mac on my lap, and it isn't even as warm as the average kitty cat.
You can also check Activity Monitor (in the Utilities folder in your Applications folder). Select "All Processes" at the top and "CPU" on the bottom bar. The CPU column will show up any intensive processes, including the occasional runaway process which will be hogging the CPU.
When your Mac seems like it's hot, check both iStatPro and Activity Monitor. If you see anything that seems unusual to you or have some specific questions, please post back.
Good luck!

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    Kernel Version: Darwin 13.3.0
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       2014-09-20 PluginProcess spin
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       2014-09-22 PluginProcess spin
       2014-09-22 PluginProcess spin
       2014-09-25 PluginProcess spin
       2014-09-26 Google Chrome spin
       2014-09-26 Google Chrome spin
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    Kernel messages
       Sep 26 17:21:23   IOPPF: Sent gpu-internal-plimit-notification last value 4 (rounded time weighted average 4)
       Sep 26 17:21:35   IOPPF: Sent cpu-plimit-notification last value 5 (rounded time weighted average 5)
       Sep 26 17:21:35   IOPPF: Sent gpu-internal-single-slice-plimit-notification last value 3 (rounded time weighted average 3)
       Sep 26 17:21:35   IOPPF: Sent gpu-internal-plimit-notification last value 3 (rounded time weighted average 3)
       Sep 26 17:21:47   IOPPF: Sent cpu-plimit-notification last value 8 (rounded time weighted average 7)
       Sep 26 17:21:47   IOPPF: Sent gpu-internal-single-slice-plimit-notification last value 3 (rounded time weighted average 3)
       Sep 26 17:21:47   IOPPF: Sent gpu-internal-plimit-notification last value 3 (rounded time weighted average 3)
       Sep 26 17:22:01   IOPPF: Sent cpu-plimit-notification last value 5 (rounded time weighted average 7)
       Sep 26 17:22:01   IOPPF: Sent gpu-internal-single-slice-plimit-notification last value 2 (rounded time weighted average 3)
       Sep 26 17:22:01   IOPPF: Sent gpu-internal-plimit-notification last value 2 (rounded time weighted average 3)
       Sep 26 17:22:21   IOPPF: Sent cpu-plimit-notification last value 10 (rounded time weighted average 9)
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       Sep 26 17:22:21   IOPPF: Sent gpu-internal-plimit-notification last value 4 (rounded time weighted average 3)
       Sep 26 17:22:34   IOPPF: Sent cpu-plimit-notification last value 8 (rounded time weighted average 8)
       Sep 26 17:22:34   IOPPF: Sent gpu-internal-single-slice-plimit-notification last value 5 (rounded time weighted average 5)
       Sep 26 17:22:34   IOPPF: Sent gpu-internal-plimit-notification last value 5 (rounded time weighted average 5)
       Sep 26 17:22:47   IOPPF: Sent cpu-plimit-notification last value 6 (rounded time weighted average 6)
       Sep 26 17:22:47   IOPPF: Sent gpu-internal-single-slice-plimit-notification last value 5 (rounded time weighted average 5)
       Sep 26 17:22:47   IOPPF: Sent gpu-internal-plimit-notification last value 5 (rounded time weighted average 5)
       Sep 26 17:23:01   IOPPF: Sent cpu-plimit-notification last value 7 (rounded time weighted average 7)
       Sep 26 17:23:01   IOPPF: Sent gpu-internal-single-slice-plimit-notification last value 5 (rounded time weighted average 5)
       Sep 26 17:23:01   IOPPF: Sent gpu-internal-plimit-notification last value 5 (rounded time weighted average 5)
       Sep 26 17:23:12   IOPPF: Sent cpu-plimit-notification last value 6 (rounded time weighted average 6)
       Sep 26 17:23:12   IOPPF: Sent gpu-internal-single-slice-plimit-notification last value 5 (rounded time weighted average 5)
       Sep 26 17:23:12   IOPPF: Sent gpu-internal-plimit-notification last value 5 (rounded time weighted average 5)
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