The flow of charge in a circuit depends on
A) adequate resistance.
B) a potential difference.
C) adequate chemical action.
D) all of the above
Answer: B
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How did star formation likely proceed in the protogalactic cloud that formed the Milky Way?
A) The protogalactic cloud gradually formed stars, starting from the center of the galaxy working outwards. B) The protogalactic cloud gradually formed stars, starting from the outer edges of the spiral arms and working inward. C) The stars that formed first eventually settled into a galactic disk, circling the center of the galaxy. D) The stars that formed first could orbit the center of the galaxy in any direction at any inclination.
The Earth's orbit has a mean radius of 1.5 × 108 km. Over a six-month period, the apparent position of a particular star varies by 0.00014° due to parallax. How distant is the star, in km?
A) 1.2 × 1011 km B) 1.2 × 1014 km C) 1.2 × 1017 km D) 1.2 × 1020 km E) 1.2 × 1023 km
A pendulum bob of mass m is set into motion in a circular path in a horizontal plane as shown in the figure. The square of the angular momentum of the bob about the vertical axis through the point P is
a.
m2 gl3 sin4 ?/cos ?
b.
m2 gl3 sin3 ?/cos ?
c.
m2 gl3 sin2 ?/cos ?
d.
m2 gl3 sin ?/cos ?
e.
m2 gl3 sin2 ?
The measure of pressure, especially in water is:
a. the press. b. the kilogram. c. the centimeter. d. the mole. e. the atmosphere.