How do humans use their eyes to measure relative distance by parallax?
a. By continuously focusing our eyes on distant objects, we can determine distance.
b. Since our eyes are separated, the brain interprets the relative look angles of these eyes in terms of distance to the object viewed.
c. Our eyes can measure the time it takes light to travel from an object and from this we get distance.
d. By moving our heads from side to side our brain compares look angles from each of these positions to obtain the distance to the object viewed.
b
RATIONALE: In Figure 8-2, think of "Earth Now" as your left eye, the Sun as your nose, and "Earth 6 months from now" as your right eye as viewed from overhead and you are looking at the blue star in the distance. The geometry is the same, but on a smaller scale.
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The concept that on the grandest of scales, the universe is similar in appearance everywhere is:
A) special relativity. B) general relativity. C) homogeneity. D) isotropy. E) universality.
Adding heat to a body will ________ the mass of the body.
Fill in the blank(s) with the appropriate word(s).
What happens every 29.5 days?
a. The Moon's Saros cycle b. The Moon's synodic cycle c. The Moon's sidereal cycle d. The Moon's ecliptic season e. The Moon's chance for a partial eclipse
Equilibrium: A 10-kg sign is held by two ropes as shown in the figure. What is the tension on rope A?
A. 44 N B. 69 N C. 72 N D. 88 N E. 98 N