Which of the following accurately describes the properties of Saturn's rings?
A. The rings are very wide but very thin and composed of small particles typically a few centimeters or meters in size.
B. The rings are a single, solid object.
C. The rings are very wide but a very thin veil of gas that surrounds the planet.
D. The rings are very wide but very thin and composed of large planetesimals a few kilometers in size.
Answer: A
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An atom of sodium has an atomic number of 11 and a mass of 23 . How many neutrons does it have?
a. 11 b. 12 c. 23 d. 34 e. 35
A red ball with a velocity of +3.0 m/s collides head-on with a yellow ball of equal mass moving with a velocity of -2.0 m/s. What is the velocity of the red ball after the collision?
A) zero B) -2.0 m/s C) +3.0 m/s D) +2.5.0 m/s E) +5.0 m/s
The physical characteristic that is used to distinguish intrusive igneous rocks from extrusive igneous rocks is _____________
a. silica content b. hardness c. color d. grain size
A 2.0-?F capacitor in series with a 2.0-k? resistor is connected to a 60-Hz AC source. Calculate the impedance of the circuit.
A. 1500 ohms B. 1800 ohms C. 2100 ohms D. 2400 ohms E. 8600 ohms