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This isn't really the right forum, and I don't have that model (I've got a dv5210us), but basically all laptops/notebooks do that. A laptop typically uses 3040W, and converts more than 95% of it to heat. By comparison, a heating pad uses about 8W and reaches 170180 degress Farenheit. So naturally the laptop will get very hot, and won't be too comfortable on one's lap.
If the laptop has a fan, make sure the vents are not obstructed, as the forced air cooling will exhaust some of that heat into the room rather than your lap.
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The probability that a laptop will get hot if insulated while running can be expressed as the integral:
/x=1

P =  sqrt(1^(s!!!)) dx
/x=0
Where s= the Processor speed in hertz. (undefined at s=0)
Richard P. Feynman spoke about this very issue in one of his later books. In brief, entropy is the way of the future.
Edited: 2 Mar 2007, 12:40 a.m. after one or more responses were posted