Intensity of Sound: The intensity at a distance of 6.0 m from a source that is radiating equally in all directions is 6.0 × 10-10 W/m2. What is the power emitted by the source?
A. 2.1 × 10-8 W
B. 2.7 × 10-7 W
C. 2.1 × 10-6 W
D. 2.7 × 10-5 W
Answer: B
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A heavy dart and a light dart are launched horizontally on a frictionless table by identical ideal springs. Both springs were initially compressed by the same amount
Which of the following statements about these darts are correct? (There could be more than one correct choice.) A) The darts both have the same kinetic energy just as they move free of the spring. B) The lighter dart leaves the spring moving faster than the heavy dart. C) The heavy dart had more initial elastic potential energy than the light dart. D) Both darts move free of the spring with the same speed. E) Both darts had the same initial elastic potential energy.
If seafloor spreading creates new lithosphere, does the size of Earth change?
A) Yes, Earth is getting larger. B) No, the extra crust is crumpled up to form mountains. C) No, older crust is recycled back into the asthenosphere. D) Yes, the Earth is shrinking because it is cooling.
Describe the reasoning leading to the idea that the number of technological civilizations in the galaxy is equal to the average lifetime of a technological civilization
What will be an ideal response?
A temperature of degrees 250 Celsius is equivalent to _____ degrees Fahrenheit
a. –9.4 b. 482.0 c. 121.1 d. –23.0