Just as water flows from a region of high pressure to a region of low pressure, electric charge flows from a region of
A) high electric pressure to a region of low electric pressure.
B) high potential energy to a region of low potential energy.
C) deep to shallow regions.
D) all of the above
Answer: A
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A car travels in a flat circle of radius R. At a certain instant the velocity of the car is 20 m/s north, and the total acceleration of the car is 2.5 m/s2 37° south of west. Which of the following is correct?
A. R = 0.40 km, and the car's speed is decreasing. B. R = 0.20 km, and the car's speed is decreasing. C. R = 0.20 km, and the car's speed is increasing. D. R = 0.16 km, and the car's speed is increasing. E. R = 0.16 km, and the car's speed is decreasing.
The microwave background we now observe dates back to ________ of matter and energy at 3,000 K
Fill in the blank(s) with correct word
Standing waves can be set up in a string when two waves that are
a. of the same frequency and amplitude, but are opposite in direction of travel, meet each other. b. of the same frequency, amplitude, and direction of travel are also 180° out of phase. c. of the same frequency, amplitude, and direction of travel meet each other. d. of the same frequency, amplitude, and velocity meet each other.
Does sound travel faster in a warm room or a cold room? Explain your answer.