What method has been used to determine the most recent time the Tharsis volcanoes on Mars have erupted?
A) measuring the thickness of lava flows on their sides
B) measuring the intensity of infrared radiation emitted by them
C) measuring the changes in sulfur compound concentrations in the planet's atmosphere
D) counting the craters on their slopes
D
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An ambulance is generating a siren sound at a frequency of 2,400 Hz. The velocity of sound is 345.0 m/s. The observer is traveling at a velocity of 24.00 m/s toward the ambulance and the ambulance is traveling at a velocity of 20.00 m/s toward the observer. What is the frequency of the siren perceived by the observer?
A. 2,489 Hz B. 2,560 Hz C. 2,675 Hz D. 2,725 Hz E. 2,830 Hz
As the sloped surface supporting a shoe becomes steeper
A) the shoe's weight mg remains unchanged. B) the normal force becomes less. C) friction needed to keep it at rest increases. D) all of the above E) none of the above
Astronaut Jennifer's lifeline to her spaceship comes loose and she finds herself stranded, "floating" 100 m from the mothership. She suddenly throws her 2.00-kg wrench at 20 m/s in a direction away from the ship
If she and her spacesuit have a combined mass of 200 kg, how long does it take her to coast back to her spaceship? A) 1000 s B) 750 s C) 500 s D) 250 s E) 2.50 min
Which of the following best describes the image for a thin, convex lens that forms whenever the object is at a distance less than one focal length from the lens?
a. upright, diminished, and virtual c. upright, enlarged, and virtual b. inverted, diminished, and real d. inverted, enlarged, and real