Concept explainers
Explain all answers clearly, with complete sentences and proper essay structure if needed. An asterisk(*) designates a quantitative problem, for which you should show all your work.
Unanswered Questions. As discussed in this chapter, we are only just beginning to learn about extrasolar planets. Briefly describe one important but unanswered question related to the study of planets around other stars. Then write two or three paragraphs in which you discuss how we might answer this question in the future. Be as specific as possible, focusing on the type of evidence necessary to answer the question and how the evidence could be gathered. What are the benefits of finding answers to this question?
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- Please answer the question and its subquestions entirely! This is one question with two subquestions. According to the official Bartleby guidelines, I am alowed to have up to two subquestion! 1) When an ice-skater spins and increases her rotation rate by pulling her arms and leg in, what happens to her kinetic energy? It stays the same. It increases. It decreases. a) A 0.400 kg mass, sitting on a horizontal frictionless surface, is attached to the end of a 0.750 m string. It is whirled around in a circular horizontal path. If the maximum tension that the string can withstand is 450 N, then what maximum velocity can the mass have if the string is not to break? 375 m/s 22.4 m/s 19.4 m/s 29.0 m/s b) A grinding wheel with a moment of inertia of 2 kg-m 2 has a 2.50 N-m torque applied to it. What is its final kinetic energy 10 seconds after starting from rest? 312 J 237 J 156 J 106 Jarrow_forward1. What do you think are the advantages and disadvantages of using points near the corners of aphoto for scale computations?2. Would you consider the aerial photo as a map substitute than a topo map? Why?3. Aside from using the topographic map, suggest other means of determining the scale of an aerialphoto. Cite your references if there are any.arrow_forwardWhy I got it wrong? Please help me to provide just few summary.arrow_forward
- Are the planets really lined up as we have them in this model? (Model is the image attatched). What is the minimum possible distance in AU between Mars and Earth? What is the maximum possible distance in AU between Mars and Eath? Show your work if possible. Thanks so much :)arrow_forwardI need urgent answers on the photo provided here pls. Thank you so much.arrow_forwardThink of our Milky Way Galaxy as a flat circular disk of diameter 100,000 light-years. Suppose we are one of 1000 civilizations, randomly distributed through the disk, interested in communicating via radio waves. How far away in light years would the nearest such civilization be from us on average? Show your working. (Hint: Begin by calculating the area of the disk. Find the area of one of a 1,000 squares. Consider the separation of the centres of two adjacent squares.)arrow_forward
- For problems requiring calculations, show the equation you will use to solve, your work, your answer, and correct units. E F=ma 6. A woman has a mass of 30 kg on earth (9am.-9.8m/s*). What is her weight? 7. The same 30 kg woman weighs 245 N on Ceres. What is the acceleration due to gravity on Ceres? 8. A man in the "Strong Man" competition pushes a 1500 kg vehicle with an acceleration of 3 m/s2? How much force did the man exert on the vehicle? 9. Using your answer from the previous question, what force did the vehicle exert on the man?arrow_forwardWrite all pertinent computations to justify your final answer To how many atmosphere pressure must a liter of gas measured at 1.00atm and 20.0oC be subjected to be compressed to half liter when thetemperature is 40.0^oC?arrow_forwardPlease explain in full detail as I am trying to understand this concept! thank you! a. Sketch a diagram including Earth, Sun, and Mars, with attention to scale of distance (Mars is about 1.5 AU from the Sun) showing a faster trajectory from Earth to Mars than the minimal energy trajectory discussed in the lecture. b. Without doing a calculation, how would the arrival velocity of the spacecraft at Mars for the case in (a) compare to the spacecraft arrival in the class example? The lecture example had the spacecraft arriving at Mars with a velocity of 22.49 km/sec. c. The average velocity of Mars in orbit around the Sun is 24.08 km/sec. Comment on the trade-offs between trajectories, arrival velocities and velocity changes (delta V) required to enter an orbit around Mars.arrow_forward
- Give a Claim and Evidence to each question.5. Is there a possibility that Physics in the context of Entropy help in the explanation of emergenceof life?arrow_forwardPLEASE be clear in your answer since the last time I posted was incorrect, thanks.arrow_forwardFiguring for Yourself. Always show your work.27. Calculate the wind speed at the edge of Neptune's Great Dark Spot, which was 10,000 kmin diameter and rotated in 17 days. (Hint: recall a circle circumference=2 x pie x radius).arrow_forward