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Valentin [98]
4 years ago
5

The current theory of the structure of the Earth, called plate tectonics, tells us what the continents are in constant motion. A

ssume that the North American continent can be represented by a slab of rock 4700km on a side and 37km deep and that the rock has an average mass density of 2720kg/m^3. The continent is moving at the rate of about 4.6cm/year.
A) what is the mass of the continent.
B) what is the kinetic energy of the continent?
Physics
1 answer:
Savatey [412]4 years ago
3 0

A) We need to first determine the volume of the continent and then mass would be = Volume x density

Volume = 4.7 x 10^6 m x 4.7 x 10^6 m x 37 x 10^3m

= 817 x 10^15 cubic meter

Mass = V x density

= 817 x 10^15 cubic meter x 2720kg/m^3

= 2.2 x 10^21 Kg

B)

Kinetic Energy = ½mV²

= ½ x 2.2 x 10^21 Kg x ( 4.6cm/year. x 1m/100cm x 1yr/365.24day x 1day/24hr x 1hr/3600s)²

= 2340 J

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