What was the primary role of dust in the formation of the solar system?
A) Dust formed the rings around Uranus, Neptune, and Jupiter.
B) Dust veiled the process by which our solar system formed.
C) Dust acted as condensation nuclei; platforms to which other particles could attach and form larger particles of matter.
D) The Sun formed from a vast spinning cloud consisting only of dust.
E) Dust provided the radioactive elements that initially heated the Sun.
C
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One stone is dropped from the side of a bridge, and a second is dropped from the same place a short time later. What is true about the distance between the stones as a function of time after both have been dropped? Ignore air resistance
A. Increases, finally reaching a constant value B. Always increases C. Is constant D. Decreases, and then reaches a constant value E. Always decreases
Microfossil evidence suggests that life
A) originated when the Earth formed 4.6 billion years ago B) originated about 3.4 billion years ago C) existed 3.85 billion years ago D) existed and was well established by 3.4 to 3.5 billion years ago
A small sphere attached to a light rigid rod rotates about an axis perpendicular to and fixed to the other end of the rod. Relative to the positive direction of the axis of rotation, the angular positions of the sphere are negative, its angular velocity is negative, and its angular acceleration is positive. The sphere is
a. rotating clockwise and slowing down. b. rotating counterclockwise and slowing down. c. rotating clockwise and speeding up. d. rotating counterclockwise and speeding up. e. first rotating counterclockwise and then clockwise.
An ac series circuit consists of a voltage source of frequency 60 Hz and voltage amplitude V, a 533-? resistor, and a capacitor of capacitance 6.4-?F
What must be the source voltage amplitude V for the average electrical power consumed in the resistor to be 989 W? There is no inductance in the circuit.