Preliminary research questions
a. Proxima Centauri is the closest star that lies 4.3 light years away from the Earth. What is the distance from Earth to Proxima Centauri?
b. If the light emitted by Proxima Centauri takes more than four years to reach Earth, how are we able to see the star instantly when we point our telescope towards it?
c. Chinese astronomers in 185 B. C. recorded a supernova explosion. The supernova was located 9100 light years away from Earth. When did the actual explosion take place? (State the date in B. C.)
Answers: 2
Physics, 21.06.2019 19:00
Find the momentum for a 2.6-kg brick parachuting straight downward at a constant speed of 8.4 m/s .
Answers: 3
Physics, 22.06.2019 05:10
Waves are used in many practical applications to support work, entertainment, and health. one example is the use of ultrasound imaging to safely track the development of a growing fetus. what is a specific example of a practical application of waves in medicine, entertainment, safety, or other fields? provide a brief explanation of how the properties of waves are useful to that application.
Answers: 3
Physics, 22.06.2019 07:00
World class speed skaters can skate a 3,000-m course in about 4 minutes.what is their average speed for this course? a. 12.5 m/sb. 1.33 m/sc. 1.25 m/sd. 13.3 m/s
Answers: 2
Physics, 22.06.2019 17:00
Air conditioners not only cool air, but dry it as well. suppose that a room in a home measures 5.0m×9.0m×2.4m . if the outdoor temperature is 30 ∘c and the vapor pressure of water in the air is 85 % of the vapor pressure of water at this temperature, what mass of water must be removed from the air each time the volume of air in the room is cycled through the air conditioner? the vapor pressure for water at 30 ∘c is 31.8 torr.
Answers: 3
Preliminary research questions
a. Proxima Centauri is the closest star that lies 4.3 light years a...
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