Venus and Earth started out with roughly the same amount of water. While Earth still has water in abundance, all of Venus' was lost. Where did it go?
A) It chemically combined with CO2 to form H2CO3.
B) Ultraviolet rays split the hydrogen from the oxygen components, and the hydrogen escaped into space.
C) It all evaporated into space due to the intense daytime heat of 470°C.
D) Scientists are still trying to determine this.
Ans: B) Ultraviolet rays split the hydrogen from the oxygen components, and the hydrogen escaped into space.
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When we look at the Andromeda Galaxy tonight though our telescope, we see this galaxy
a) as it was just after the big bang b) as it was 3.2 years ago as it was when the light left this galaxy c) as it is now because light travel instantaneously d) as it was 2.5 million years ago when the light that we are seeing today left that galaxy
If the voltage across a resistor is tripled, the current will
a. remain the same. b. be cut to one-third. c. be cut by one-third. d. be tripled. e. be multiplied by nine.
Objects A and B, of mass M and 2M respectively, are each pushed a distance d straight up an inclined plane by a force F parallel to the plane. The coefficient of kinetic friction between each mass and the plane has the same value mk. At the highest point,
a. KA > KB. b. KA = KB. c. KA < KB. d. The work done by F on A is greater than the work done by F on B. e. The work done by F on A is less than the work done by F on B.
Although tornadoes occur in many parts of the world, they are very common
A) along the Gulf Coast. B) in the northeastern part of the United States. C) in the Central Plains. D) on the western slopes of the Rockies.