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sjbauer1215

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**5.5 g/cm3**. Earth's inner core has the highest density at 12.9 g/cm3 [more than double the average]. Its surface gravity is measured in units of acceleration, which, in the SI system, are meters per second squared. It may also be expressed as a multiple of the Earth's standard surface gravity, which is equal to

*g*= 9.80665 m/s2. Near Earth's surface, the gravity acceleration is approximately 9.81 m/s2 (32.2 ft/s2), which means that, ignoring the effects of air resistance, the speed of an object falling freely will increase by about 9.81 meters (32.2 ft) per second every second.

If 80% of a planet's density exists within 20% of the planet's innermost sphere, what is the standard surface gravity of this innermost sphere? Additionally what is the gravitational rate of acceleration near this innermost sphere?