The central region of an atom is called the ________.
Fill in the blank(s) with the appropriate word(s).
nucleus
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According to the universal law of gravitation, if you triple the distance between two objects, then the gravitational force between them
A) increases by a factor of 9. B) decreases by a factor of 9. C) decreases by a factor of 3. D) increases by a factor of 3.
Which of the following objects would be most likely to produce an emission-line spectrum?
A) a star like our Sun B) a light bulb C) the Earth D) a neon light
A 5,000 kg satellite is orbiting the Earth in a circular path. The height of the satellite above the surface of the Earth is 800 km. The velocity of the satellite is 
A. 7,460 m/s. B. 6,830 m/s. C. 6,430 m/s. D. 5,950 m/s. E. 5,350 m/s.
A 2.0 kg softball is pitched to you at 20. m/s. You hit the ball back along the same path, and at the same speed. If the bat was in contact with the ball for 0.10 s, the average force the bat exerted was
A) 0.40 kN. B) 40. N. C) zero. D) 0.80 kN. E) 0.65 kN.