The Sun's location in the Milky Way Galaxy is ________
A) in the galactic disk, roughly halfway between the center and the outer edge of the disk
B) in the halo of the galaxy, about 28,000 light-years above the galactic disk
C) very near the galactic center
D) at the very outer edge of the galactic disk
A
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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 acceleration of the marble as viewed by the observers inside the satellite? 
A. 0.00 
B. 1.62
C. 2.64
D. 4.90
E. 9.24
The first evidence confirming the crystal structure of matter was
A) the citing of experiments by Nobel Prize-winning scientists. B) testimonials by crystal-loving investigators. C) X-ray diffraction patterns.
If you place a plane mirror vertically into water, and a dolphin moves toward it with a speed of 4 m/s, she will see her image move toward her at a relative speed of
A) 6. m/s. B) 10. m/s. C) 2. m/s. D) 4. m/s. E) 8. m/s.
X-rays of wavelength 0.20 nm are scattered by a free electron
the change in the wavelength of the x-rays is observed to be 2.0 × 10-12 m at a certain scattering angle measured relative to the incoming x-ray direction. What is the scattering angle of the x-rays? (melectron = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s) A) 60° B) 80° C) 20° D) 40°