When a rocket is traveling toward a mountain at 100 m/s, the sound waves from this rocket's engine approach the mountain at speed V. If the rocket doubles its speed to 200 m/s, the sound waves from the engine will now approach the mountain at speed
A) 4V.
B) 2V.
C) V.
D) V.
Answer: D
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Answer the following statement(s) true (T) or false (F)
1. Suppose that a gas expands in a cylinder, pushing back a piston with a speed of 20 m/s (about 45 mi/h). We can reasonably consider such an expansion to be quasistatic. 2. In a tub, 100 kg of water at 30°C absorbs 100 J from an electric heater. We can reasonably consider the water to be a reservoir in this process.
A current carrying loop of wire lies flat on a table top. When viewed from above, the current moves around the loop in a counterclockwise sense
(a) For points OUTSIDE the loop, the magnetic field caused by this current A) circles the loop in a clockwise direction. B) circles the loop in a counterclockwise direction. C) points straight up. D) points straight down. E) is zero. (b) For points INSIDE the loop, the magnetic field caused by this current A) circles the loop in a clockwise direction. B) circles the loop in a counterclockwise direction. C) points straight up. D) points straight down. E) is zero.
Which of the following best describes how the Drake equation is useful?
A) It tells us what wavelengths of light will be most useful to examine in the search for extraterrestrial intelligence. B) It allows us to calculate the masses of planets orbiting other stars. C) It has allowed us to determine the number of civilizations in the Milky Way Galaxy. D) It helps us understand what we need to know in order to determine the likelihood of finding other civilizations.
Both sound waves and electromagnetic radiation:
A) travel at the speed of light. B) require a medium to move through space. C) can move through space without a medium. D) transfer energy. E) are transverse waves.