Suppose your telescope has perfect mirrors and is limited only by diffraction. If you are viewing with light of 400 nm wavelength,
what diameter mirror in a space telescope would have 1.0-km resolution of objects on Mars when viewed from above the earth at a time when the Earth-Mars distance of 80 million kilometers?
A) 39 km
B) 3.9 m
C) 3.9 km
D) 39 m
E) 390 m
D
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A 75-kg swimmer dives horizontally off a 500-kg raft. The diver's speed immediately after leaving the raft is 4.0 m/s. A micro-sensor system attached to the edge of the raft measures the time interval during which the diver applies an impulse to the raft just prior to leaving the raft surface. If the time interval is read as 0.20 s, what is the magnitude of the average horizontal force by diver on the raft?
a.900 N b.450 N c.525 N d.1500 N
What is the origin of Earth's atmosphere?
A. Gases were released into the atmosphere by volcanic eruptions. B. Gases were brought to Earth by cometary impacts. C. Gases were released when planetesimals impacted Earth's surface and melted it. D. All of these choices are correct.
Which of the following was the most perfect region according to Aristotle's philosophy?
A) The center of the Sun B) The heavens C) Earth's surface D) Earth's center
While standing at a crosswalk, you hear a frequency of 600 Hz from an approaching police car. After the police car passes, its frequency is 400 Hz. What is the speed of the police car? (speed of sound = 340 m/s)
a. 34.0 m/s b. 60.0 m/s c. 66.3 m/s d. 68.0 m/s e. 199 m/s