Notice that the parallax is greater (the apparent movement is larger) for the person than for the trees, and that the mountains do not appear to shift at all. Why?
A. The amount of parallax depends on an object's size, with greater parallax for larger objects.
B. The amount of parallax depends on an object's size, with greater parallax for smaller objects.
C. The amount of parallax depends on an object's distance, with greater parallax for more distant objects.
D. The amount of parallax depends on an object's distance, with greater parallax for nearer objects.
Answer: D. The amount of parallax depends on an object's distance, with greater parallax for nearer objects.
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Which method of fueling your car is likely to be more energy efficient, and why: gasoline used in a standard car engine or electricity taken from a coal-fueled generating plant and stored in lightweight car batteries? Assume that the batteries
convert electricity to work at 100% efficiency, and that electricity is transported from the power plant to the car at 100% efficiency. A) Gasoline used in a standard car engine, because a car engine's fuel burns hotter and more efficiently than does the coal in a coal-fired power plant. B) Electricity from a coal-fired generating plant, because a car engine is a heat engine, and must follow the second law of thermodynamics, whereas a coal-fired generating plant is not. C) Gasoline used in a standard car engine, because a car engine burns its fuel directly in the automobile rather than miles away at the power plant. D) Electricity from a coal-fired generating plant, because such a plant runs at higher energy-efficiency than does a car engine. E) It wouldn't make any difference, because both the car engine and the generating plant are heat engines and are thus subject to the second law of thermodynamics.
A 20-ton truck collides with a 1500-lb car. Which of the following statements must be true?
A) During the collision, the force on the truck is smaller than the force on the car. B) The car did not slow down during the collision, but the truck did. C) During the collision, the force on the truck is equal to the force on the car. D) The truck did not slow down during the collision, but the car did. E) During the collision, the force on the truck is greater then the force on the car.
A 0.28-kg stone you throw rises 34.3 m in the air. The impulse the stone receives from your hand while being thrown is
a. 2.7 N s, up. b. 2.7 N s, down. c. 7.3 N s, up. d. 7.3 N s, down. e. 9.6 N s, up.
What happens when a planet passes in front of its star (i.e. between the star and us)?
a) The star increases in brightness and the star moves away from us b) The star increases in brightness and the star moves towards us c) The star decreases in brightness and the star moves towards us d) The star does not change in brightness or move relative to us e) The star decreases in brightness and the star moves away fromus