In a double-slit experiment, the distance between the slits is 0.2 mm and the distance to the screen is 100 cm. What is the phase difference (in degrees) between the waves from the two slits arriving at a point 5 mm from the central maximum when the wavelength is 400 nm? (Convert your result so the angle is between 0 and 360°.)
a. 90°
b. 180°
c. 270°
d. 360°
e. 160°
b
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Which of the following stellar properties has the greatest range in values?
A) surface temperature B) radius C) luminosity D) core temperature E) mass
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.
The initial speed of a cannon ball is 0.20 km/s. If the ball is to strike a target that is at a horizontal distance of 3.0 km from the cannon, what is the minimum time of flight for the ball?
a. 16 s b. 21 s c. 24 s d. 14 s e. 19 s
If two straight lines start out parallel but eventually cross, then they must be in a
A) spherical geometry. B) flat geometry. C) saddle-shaped geometry. D) spacetime geometry.