Will Mars ever appear to the unaided eye as large as the Moon at closest approach? Explain
What will be an ideal response?
No. Mars is small, and even at closest approach it is so distant from Earth that it takes large telescopes with the best conditions to resolve surface features as small as 100 km across. With the unaided eye, Mars appears as a small point of reddish light shining more brightly than the stars.
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Boiling is the process of evaporation
A) beneath the water surface. B) at its extreme. C) that cools instead of warms.
What are the different colored horizontal layers that we see in this photo of a wall in the Grand Canyon?
A) They are sediments deposited at different times in the past, so that layers near the bottom are the oldest and layers near the top are the youngest. B) They are different types of volcanic rock that cooled at different rates after a single, large volcanic eruption. C) They formed as the Colorado River carved out the canyon, so that the layers near the top are the oldest and the layers at the bottom are the youngest. D) They got their coloration from ancient civilizations that painted the rock.
Shown here is a schematic of Young's experiment that demonstrated the interference of light. What is the role of slit S? (See pages 385–386 in your textbook for more on this experiment.)
a. It focuses the light from the broad beam source. b. It forms a pattern of waves so that the light arriving at the silt S1 is "in step" with light arriving at S2. c. It serves as an object whose image appears as a line on the screen. d. It forms an image of the light source. e. It separates the colors that are then focused by the double slit.
Projectile Motion: A plane flying horizontally at a speed of 50 m/s and at an elevation of 160 m drops a package, and 2.0 s later it drops a second package. How far apart will the two packages land on the ground if air resistance is negligible?
A. 100 m B. 160 m C. 180 m D. 320 m