What causes the sun to "bob" up-and-down in its orbit around the galactic center?
A) gravitational attraction towards other nearby galaxies
B) the localized pull of stars within the disk itself
C) lack of friction with the low-density interstellar medium
D) A and B
E) B and C
E
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A conducting bar moves as shown near a long wire carrying a constant 50-A current. If a = 4.0 mm, L = 50 cm, and v = 12 m/s, what is the potential difference, VA?VB?
A. +15 mV B. ?15 mV C. +20 mV D. ?20 mV E. +10 mV
If Earth's mass decreased to one-half its original mass with no change in radius, your weight would
A) decrease to one-quarter. B) decrease to one-half. C) remain the same. D) none of the above
Most of the world's water is in
A) icecaps. B) glaciers. C) rivers and lakes. D) the oceans.
Nellie tosses a ball upward at an angle. Neglecting air resistance, the horizontal component of the initial velocity
A) decreases with time. B) remains constant. C) increases with time.