Mechanical energy mechanical energy of the colliding objects has been converted into an equal amount of heat. Thus, the total energy of the system remains unchanged though the mechanical energy of the system has reduced. A satellite of mass formula_4 at a distance formula_5 from the centre of Earth possesses both kinetic energy, formula_6, (by virtue of its motion) and gravitational potential energy, formula_7, (by virtue of its position within the Earth’s gravitational field; Earth's mass is formula_8). Hence, mechanical energy formula_9 of a satellite is given by If the satellite is in circular orbit, the energy conservation equation can be further
Feathers: The Evolution of a Natural Miracle Adult Science Book category, presented by the American Association for the Advancement of Science and Subaru. "Feathers" was listed among the top ten best books of 2011 in the Sci-Tech category by the "Library Journal". "Feathers" received the John Burroughs Medal in 2013, which is awarded annually by the John Burroughs Association to "the author of a distinguished book of natural history". Reception to "Feathers" has been positive. Amanda Katz, in a review published by "The New York Times", wrote that because "Feathers" is a work of synthesis, bird enthusiasts will find the book's content already "familiar", but noted that