3. A satellite moves in a circular orbit just above the surface of a planet, assumed to offer no air resistance. If the satellite's orbit speed is v, the escape velocity from the planet is (A)v (B)√2 v (C)√3 v (D)2v (E)2√2 v

5. A solid wheel with mass M, radius R, and rotational inertia MR²/2, rolls without sliding on a horizontal surface. A horizontal force F is applied to the axle and the center of mass has an acceleration a. The magnitudes of the applied force F and the frictional force f of the surface, respectively, are: (A)F = Ma, f = 0 (B)F = Ma, f = Ma/2 (C)F = 2Ma, f = Ma (D)F = 2Ma, f = Ma/2 (E)F = 3Ma/2, f = Ma/2

3. A satellite moves in a circular orbit just above the surface of a planet, assumed to offer no air resistance. If the satellite's orbit speed is v, the escape velocity from the planet is
(A)v
(B)√2 v
(C)√3 v
(D)2v
(E)2√2 v

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