The period we call the "heavy bombardment" was
A) the first few hundred thousand years of the solar system's history.
B) the most recent hundred million years of the solar system's history.
C) the first few hundred million years of the solar system's history.
D) a period of a few hundred million years that began when the solar system was about 1 billion years old.
E) the time during which an asteroid hit the Earth and caused the extinction of the dinosaurs.
C) the first few hundred million years of the solar system's history.
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The celestial equator always passes directly overhead
a. True b. False Indicate whether the statement is true or false
Parallel-Plate Capacitor: Two large closely-spaced parallel metal plates are uniformly and oppositely charged and the electric field between them is 7.6 × 106 N/C.(a) What is the charge per unit area on each plate?(b) If the plates are now moved two times farther apart, what is the electric field between the plates?
What will be an ideal response?
Which of the following is the reason for the leap years?
A) precession of Earth's axis B) the tilt of Earth's axis C) the combined effect of the rotation of Earth and its orbit about the Sun D) Earth year being a non-integer number of Earth days E) the non-circular orbit of Earth around the Sun
A rock falls from a vertical cliff that is 4.0 m tall and experiences no significant air resistance as it falls. At what speed will its gravitational potential energy (relative to the base of the cliff) be equal to its kinetic energy?
A) 3.1 m/s B) 4.4 m/s C) 6.3 m/s D) 8.9 m/s E) 13 m/s