Part A Knowledge and Understanding [20 marks] Multiple Choice , Use a CA Pl TAL letter that best completes the statement or answers the question 1. The gravitational force between two spherical masses is F !. Which of the following would decrease the gravitational force between the objects to 0.25Fr? a) decreasing the mass of one object to halfits original value. b) increasing the distance by a factor of 2. c) decreasing the distance to 0.5 the original value. at increasing the mass of both objects by a factor of 2. 2. For a given mass, m, and a given distance, d. separating you and the object, which of the following would exert a stronger gravitational force on you? a) an object of mass 7m a distance 15d away. b) an object of mass 9m a distance 5d away. c) an object of mass 8m a distance 3d away. (1) an object of mass 12m a distance 4d away. 3. A small object has an excess of 4.7 x IO\" electrons. The magnitude of the electric potential at a distance of 0.200 m from the object would be: (e: 1.6 x 10'15 C) a) 2.7 )1 MW b) 3.4x103V c) 2.1 x 102W d) 2.6 x MW e) 1.2 x 10-3?v 4. A satellite is in a circular orbit around the Earth at an altitude of 650 km. What orbital speed most the satellite maintain to stay in orbit at this altitude? a) 5.7 X 103 m/s c) 2.5 X 104 m/s b) 7.5 X103 m/s d) 7.9 X 104 m/s