Which observation(s) and/or experiment(s) demonstrate ways that the chemical building blocks of life (amino acids and DNA bases) could have originated on the early Earth?
A) Amino acids and DNA bases form from simple chemical reactions in experiments simulating the early Earth atmosphere.
B) These complex molecules have been found within meteorites.
C) Experiments have shown that naturally occurring clays can catalyze the formation of RNA strands.
D) All of the above
D
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Why doesn’t Earth have large volcanoes like those on Mars?
a. Earth's gravitational field is very strong and it pulls the planet into a spherical shape. b. Earth is not as geologically active as Mars. c. Earth’s crust is not thick enough to support such large mountains, moreover, its plates move. d. Large mountains on Earth are quickly eroded by the active dense atmosphere.
The fastest we could accelerate a chemical rocket to (assuming using 100 stages!) is approximately
A) 50% of the speed of light B) 0.001% of the speed of light C) 0.1% of the speed of light D) 100% of the speed of light
You observe two helium balloons floating next to each other at the ends of strings secured to a table. The facing surfaces of the balloons are separated by 1-2 cm. You blow through the opening between the balloons. What happens to the balloons?
1.They move toward each other. 2.They move away from each other. 3.They are unaffected.
A race car starts from rest on a circular track of radius 400 m. Its speed increases at the constant rate of 0.500 m/s2. At the point where the magnitudes of the radial and tangential accelerations are equal, determine (a) the speed of the race car, and (b) the elapsed time.
What will be an ideal response?