A car starts from rest and accelerates uniformly at 3 m/s2. A second car starts from rest 6 s later at the same point and accelerates uniformly at 5 m/s2. How long does it take the second car to overtake the first car?
A) 24.0 s
B) 12.2 s
C) 35.0 s
D) 18.9 s
E) 22.7 s
E
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Evidence of liquid water in Mars' distant past suggests that it had a substantial atmosphere compared to what it has presently. What happened to its water vapor?
A) The carbon dioxide in its atmosphere dissolved in the water and combined with surface rocks. B) Its atmosphere was mostly hydrogen and helium. Mars' gravity is too weak to hold them. C) The water vapor has frozen out into the polar ice caps and permafrost as Mars has cooled. D) Mars initially had such a large greenhouse effect that the atmosphere became quite hot and slowly escaped. E) It has now all been lost in space, including the carbon dioxide and water vapor.
You are holding on to one end of a long string that is fastened to a rigid steel light pole. After producing a wave pulse that was 5 mm high and 4 cm wide, you want to produce a pulse that is 6 cm wide but still 5 mm high. You must move your hand up and down once,
a. the same distance up as before, but take a shorter time. b. the same distance up as before, but take a longer time. c. a smaller distance up, but take a shorter time. d. a greater distance up, but take a longer time. e. a greater distance up, but take the same time.
Europa is one of the most promising of the bodies in the outer solar system for life in its salty seas
Indicate whether the statement is true or false
Like the Sun and the Moon, the stars appear to move from west to east from one day to the next
Indicate whether the statement is true or false