Vision Problems: What is the uncorrected near point of a farsighted person who can comfortably read a newspaper held 25 cm from his eyes when he wears +3.33-diopter contact lenses?
A. 1.5 m
B. 0.50 m
C. 1.9 m
D. 0.75 m
E. 0.60 m
Answer: A
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Estimate the heat transfer from the fin shown in Figure 2-65. Write the necessary node equations and then solve for the temperatures. Assume the fin is aluminum.
Which of the following explains why Polaris will no longer be the North Star 1,000 years from now?
A) Earth rotates once each day. B) Earth orbits the Sun once each year. C) The direction of Earth's axis in space precesses with a period of about 26,000 years. D) Stars appear to move randomly relative to our Sun in the local solar neighborhood. E) The universe is expanding.
Why are collisions between asteroids in the asteroid belt rare?
A) The average distance between asteroids is millions of kilometers. B) All asteroids orbit in perfect circular orbits at the same speed. C) Jupiter's gravity keeps asteroids apart. D) The gas surrounding the asteroids help them repel each other before colliding. E) There are only a few asteroids in the solar system.
The Sun and Moon both have an effect on the tides. Which one has the larger effect, and why?
A. The Sun, because its force differs more between the surface and center of the Earth B. The Moon, because its force differs more between the surface and center of the Earth C. The Moon, because it exerts a larger force on the ocean D. The Sun, because it exerts a larger force on the ocean E. Both the sun and Moon equally affect the tides