Our most detailed knowledge of Uranus and Neptune comes from
A) ground-based radio telescopes.
B) spacecraft exploration.
C) ground-based visual telescopes.
D) the Hubble Space Telescope.
E) manned missions.
B
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Imagine placing two long wires parallel to each other. If conventional currents flow through them in the directions shown, will the wires attract each other, repel each other, or exert no net force on each other?
A. Attract each other
B. Repel each other
C. Exert no net force on each other
A 4,000 kg satellite is traveling in a circular orbit 200 km above the surface of the Earth. A 3.00 gram marble is dropped inside the satellite. What is the force of gravity on the marble as viewed by the observers on the Earth? 
A. 0.405 N B. 0.362 N C. 0.277 N D. 0.202 N E. 0.185 N
The captain of a spaceship orbiting planet X discovers that to remain in orbit at from the planet's center, she needs to maintain a speed of What is the mass of planet X? (G = 6.67 × 10-11 N ? m2/kg2 )
A) 2.8 × 1019 kg B) 4.2 × 1017 kg C) 2.8 × 1016 kg D) 4.2 × 1014 kg
A substance most commonly emits heat energy by the process of
A) conduction. B) convection. C) radiation. D) none of the above