Paleozoic sedimentary rocks derived from marine deposits are widely distributed in all of the continents. What does this indicate about the height of the continents relative to sea level during the Paleozoic?
What will be an ideal response?
Answer: During the Paleozoic, periodic active and rapid seafloor spreading allowed the oceanic lithosphere to stand high on the asthenosphere. This resulted in shallower ocean basins, a condition that forced seawater onto low portions of the continents. The ultimate result was a rise in sea level and the formation of shallow seas on top of continental crust.
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A catapult fires an 800-kg rock with an initial velocity of 100 m/s at a 40° angle to the ground. The magnitude of the horizontal impulse the catapult receives from the rock is
A.
s.B.
s.C.
s.D.
s.E.
s.A car is moving along a straight highway and accelerates at a constant rate while going from point A to point B. If the acceleration is positive, increasing the speed of the car, where does the position where the instantaneous speed equals the average speed occur for the interval from A to B?
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