An 8000 kg satellite is launched from the surface of the earth, and injected into a circular orbit at an altitude of 100 km above the surface of the earth. The gravitational potential energy of the satellite in the circular orbit is 
A. 
B. 
C. 
D. 
E. 
B.
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Radioactivity Basics: During ?+ decay
A. a neutron is transformed to a proton. B. a proton is transformed to a neutron. C. a neutron is ejected from the nucleus. D. a proton is ejected from the nucleus. E. the number of nucleons decreases.
Where are most of the known asteroids found?
A) between the orbits of Mars and Jupiter B) in the Kuiper belt C) in the Oort cloud D) between the orbits of the jovian planets E) between the orbits of the terrestrial planets
In an inelastic collision between two objects with unequal masses:
a. the velocity of one will increase by the amount that the velocity of the other decreases. b. the momentum of one will increase by the amount that the momentum of the other decreases. c. the energy of one increases by the amount that the energy of the other decreases. d. the total momentum of the system will decrease.
A proton falls through a potential drop of 400 V. How much is the change of potential energy of this proton in falling through this potential drop?
A) 6.4 × 10-16 J B) -6.4 × 10-16 J C) 17 × 10-16 J D) -4000 J E) 4000 J