Author Question: The earliest atmosphere of Earth was ____. A)essentially the same as our modern atmosphere ... (Read 90 times)

c0205847 · **on:** Jul 13, 2018

The earliest atmosphere of Earth was ____.
A)essentially the same as our modern atmosphere
B)composed entirely of nitrogen
C)composed of ozone and hydrogen
D)blown into space by solar wind
E)composed entirely of ozone

Question 2

Is it possible to change the velocity of a stream but have it maintain the same discharge? Explain.

bpool94 · **Reply #1 on:** Jul 13, 2018

Answer to Question 1

D

Answer to Question 2

Yes. The discharge (Q) is a product of the velocity (V) and the cross-sectional area (A ); that is, Q = VA. To maintain the same discharge while changing the velocity, it is necessary to change the cross-sectional area at the same time, and in the opposite manner. For example, if the velocity is increased, the cross-sectional area would need to be decreased by an appropriate amount.