Oxygen did not build up in the atmosphere as soon as life began to produce it because the oxygen was pulled back out of the atmosphere by reactions with surface rocks
Indicate whether the statement is true or false
TRUE
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The sunspot cycle affects ____________. I. the latitude at which most sunspots occur II. the number of sunspots that are visible. III. the rotation rate of the sun's equator IV. the magnetic polarity of the sunspot pair members in a hemisphere
a. I & II b. I & IV c. II & III d. I, II & III e. I, II, & IV
In what two ways is Titan's atmosphere like our own? Now name two differences
What will be an ideal response?
Which pair of ball-drop experiments will best test whether mass affects the acceleration of gravity?
Exp 1. Mass 0.5 kilograms, height 20 meters Exp 2. Mass 5.0 kilograms, height 20 meters Exp 3. Mass 0.5 kilograms, height 30 meters A) Exp 1 and 3 B) Exp 1 and 2 C) Exp 2 and 3
An electron is released from rest at a distance of 9.00 cm from a fixed proton. How fast will the electron be moving when it is 3.00 cm from the proton?
(k = 1/4??0 = 8.99 × 109 N ? m2/C2, e = 1.60 × 10-19 C, melectron = 9.11 × 10-31 kg, mproton = 1.67 × 10-27 kg) A) 75.0 m/s B) 106 m/s C) 130 m/s D) 1.06 × 103 m/s E) 4.64 × 105 m/s