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# Application of Universal Gravity non-orbital motion Kinetic Energy mp2 Escape velocity EX-11 Find the Minimum speed... Application of Universal Gravity non-orbital motion Kinetic Energy mp2 Escape velocity EX-11 Find the Minimum speed needed for an object escape form the Earth surface. Gravitational mM Potential Energy U = -G G = 6.67 x 10-11 Work and Energy Woth = AE (2) Conservation of mechanical energy E = E (3) V = 0 Final: object at infinite Ey = y + Ug = źmv} + (-GMT) =0 4 Step procedures of solving work and energy problems Normal force (10) List other forces Friction force (W. - - W, -Parcos Wother 0 0 Water 012) If YES, y zero at infinity y changes? if No, do not need to consider U, 1 YES, compressing/stretching distance Is there a spring? if No, do not need to considers System initial System final Er - Ny+ Ugr + Hop E = E VA 3 Mm +-G Vi =? Initial: at the earth's surface 2GM RE = 11.2 km/s #### Earn Coins

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