EBK LIFE IN THE UNIVERSE
4th Edition
ISBN: 9780134080321
Author: SHOSTAK
Publisher: YUZU
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Chapter 12, Problem 22TYU
Looking for signals from star systems is a poor approach, because any truly advanced civilization will have moved beyond its home planet and populated interstellar space.
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While cruising down University Boulevard you are stopped by a cop who states that you ran a red traffic light. Because you don't
want to pay the stiff fine, you are attempting a physics defense. You claim that due to the relativistic Doppler effect, the red color of
the light λ=616 nm appeared green '=531 nm to you. The cop makes a quick calculation of his own and rejects your defense.
How fast, in terms of your speed u divided by the speed of light in vacuum c, would you have to drive to justify your claim? Note
that the speed u is taken to be a positive quantity.
U 4.0
C
220 V is supplied to 800 primary turns of an autotransformer. What will the outputvoltage be across 200 secondary turns?
2. A filament transformer has a turns ratio of 1:20. What current must be supplied to theprimary windings if 5 A is required by the filament?
3. The filament transformer in the previous question is supplied with 150 V to theprimary side. What is the secondary voltage?
4. 440 V is supplied to 1000 primary turns of an autotransformer. If the desired outputvoltage is 100 V how many secondary turns must be tapped?
Chapter 12 Solutions
EBK LIFE IN THE UNIVERSE
Ch. 12 - What is the purpose of the Drake equation? Define...Ch. 12 - What is convergent evolution? How does this idea...Ch. 12 - Prob. 3RQCh. 12 - Prob. 4RQCh. 12 - Briefly describe early attempts at interplanetary...Ch. 12 - Briefly discuss early SETI efforts. What do we...Ch. 12 - What are the three general categories of signals...Ch. 12 - Why do SETI researchers assume that beacon signals...Ch. 12 - Summarize the current techniques of radio SETI and...Ch. 12 - Explain why it is reasonable to imagine optical or...
Ch. 12 - Prob. 11RQCh. 12 - What are the three distinct categories of...Ch. 12 - Briefly discuss some of the issues that would...Ch. 12 - Discuss several types of claims about alien...Ch. 12 - Humans are the crown of creation and an inevitable...Ch. 12 - If, for some reason, we humans were to suddenly...Ch. 12 - Prob. 17TYUCh. 12 - Most of the intelligence in the universe is not...Ch. 12 - Because SETI researchers are listening to star...Ch. 12 - Prob. 20TYUCh. 12 - Prob. 21TYUCh. 12 - Looking for signals from star systems is a poor...Ch. 12 - If 10,000 people saw the same UFO, scientists...Ch. 12 - The absence of any scientific evidence for alien...Ch. 12 - The end result of a calculation with the Drake...Ch. 12 - Which of the following statements is true about...Ch. 12 - The fact that marine predators like dolphins and...Ch. 12 - Which of the following would lead an animal to a...Ch. 12 - Prob. 29TYUCh. 12 - Why are we more likely to be able to detect a...Ch. 12 - What is the distinguishing characteristic that...Ch. 12 - Two-way conversation with other societies is...Ch. 12 - Prob. 33TYUCh. 12 - One reason scientists doubt that crop circles have...Ch. 12 - Alien Visits. Learn more about a particular claim...Ch. 12 - Prob. 39IFCh. 12 - Evolution of Intelligence. Based on your...Ch. 12 - Intelligence on Other Worlds. Consider again the...Ch. 12 - Talking Back. Suppose SETI were to find a signal...Ch. 12 - Contact. Watch the movie Contact, paying careful...Ch. 12 - Invasions of Movie Aliens. Choose a science...Ch. 12 - Prob. 47IFCh. 12 - Actual SETI Searches. Project Phoenix, the largest...Ch. 12 - Power Used by E.T. A modern SETI search using the...Ch. 12 - Detecting Signals. SETI scientists are sometimes...Ch. 12 - Societal Reaction. It is frequently said that the...Ch. 12 - Dealing with UFO Claims. Given the large number of...
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- 220 volts is supplied across 1200 winding of the primary coil of the autotransformer.If 1650 windings are tapped, what voltage will be supplied to the primary coil of thehigh-voltage transformer?2. A kVp meter reads 86 kVp and the turns ratio of the high-voltage step-up transformeris 1200. What is the true voltage across the meter?3. The supply voltage from the autotransformer to the filament transformer is 60 volts. If theturns ratio of the filament transformer is 1/12, what is the filament voltage?4. If the current in the primary side of the filament transformer in question 3 were 0.5 A,what would be the filament current?5. The supply to a high-voltage step-up transformer with a turns ratio of 550 is 190 volts.What is the voltage across the x-ray tube?arrow_forward220 V is supplied to 800 primary turns of an autotransformer. What will the outputvoltage be across 200 secondary turns? 2. A filament transformer has a turns ratio of 1:20. What current must be supplied to theprimary windings if 5 A is required by the filament? 3. The filament transformer in the previous question is supplied with 150 V to theprimary side. What is the secondary voltage? 4. 440 V is supplied to 1000 primary turns of an autotransformer. If the desired outputvoltage is 100 V how many secondary turns must be tapped?arrow_forwardPlease solve and answer thw question correctly please. Thank you!!arrow_forward
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