Aplanet orbits a star along an elliptical path systems. in which of the following systems does the total mechanical energy of the system remain constant? a. the open system containing the planet b. the open system containing the planet and the star. c. the closed system containing the planet. d. the closed system containing the planet and the star

c) up

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igneous rocks also form where plates converge. the subducting plate melts as it sinks into the crust of the earth, and the melt rises into the overriding plate forming volcanoes. metamorphic rocks are formed mainly in the lithosphere, wherever there is high pressure and high temperature. -woods

0 = 0.40 / 0 = 0

= 0.20 = 9.80 ⁄2 =?

=0 , = = 0.20 =0.50 0 0.40 ⁄

=0−122 =0−12(9.80 ⁄2)(0.50)2 =1.2