Clarification/Follow-up by isizathu on 07/26/06 3:35 am:
The data you provided lacks sufficient information to answer all your questions.

The planet's 5 x mass can be caused by a bigger diameter, by a heavier core, or by a combination of both. The different consequences would be enormous.

For weather conditions a heavier core would not change much (probably the magnetic field), but a bigger diameter with 2/3 water surface would, even with a 30 hour rotation.

Also the atmospheric content and pressure are important, as that is directly related to the possibility of a temperate zone.

And for weight a bigger diameter would not do much, but a heavier core would.

Clarification/Follow-up by arcura on 07/26/06 8:13 am:
Being 5 times the mass of Earth it would have both a heavier core and a bigger diameter; in this case both 5 times that of Earth.
Being 5 times the mass of Earth a 100 pound person there would weigh 500 pounds regardless of the size of the core or planet diameter.
What would plants on such a world be like and grow like? What could swim in water that would be 5 times denser? What would the fish be like for example?
How liquid would the water be?
If there were intelligent beings on that planet what would they look like (use your imagination)?
If something fell on such a planet it would hit mach harder that on earth, etc.
Peace and kindness,
Fred

Clarification/Follow-up by isizathu on 07/26/06 4:30 pm:
mass is not the same as weight, arcura.

mass is a measurement of the amount of matter something contains (the number of protons, neutrons and electrons), while weight is the measurement of the pull of gravity on an object. and gravity changes with the elements involved: a hydrogen only planet of 1000 miles diameter has a much lower gravity than a 1000 miles diameter consisting of uranium 238 only, and so identical masses (could) weigh different there.

mass is measured by using a balance comparing a known amount of matter to an unknown amount of matter. weight is measured on a scale.
the mass of an object doesn't change when an object's location changes. weight on the otherhand does change with location.

5 times the mass of earth can be arrived at in two ways: by a bigger diameter of the planet or by a different consistence of the planet (with more heavier elements than earth).

the consequences would be great: a person of 100 pounds on earth would be weighing anything there. it all depends on the gravity of the planet.

and that different gravity would influence also all other points you made, from plants to liquidity to fish to intelligence.

Clarification/Follow-up by arcura on 07/26/06 8:02 pm:
Mass = the property of a body that causes it to have weight in a gravitational field.

As example: "The moon's density, about 3.3g/cm3 is less than Earth's and it's mass is only about one eightieth Earth's."
Because the moon’s mass is far less than the earth a person would weigh far less on the moon than on the earth, about 1/6th to 1/8th as much.

So generally speaking you can answer the questions I posted if you have the knowledge of physics etc, to be able to.

Clarification/Follow-up by isizathu on 07/27/06 1:35 am:
nobody can answer your questions, unless there is more info. without that any answers remain based on personal belief instead of science.

as you refer to planet earth, the most important one to allow answering your questions correctly is knowing the diameter of that planet, as only that way you can estimate it's gravitational strenght.
5 times earth mass does not mean 5 times earth gravity. gravity results from the total mass per element.
that's what I tried to convey to you, and that's what you insist to ignore here.

Clarification/Follow-up by arcura on 07/27/06 7:47 am:
Very well.
The planet has 5 times the earth's gravity.
Peace and kindness,
Fred