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Explain all answer clearly, with complete sentences and proper essay structure if needed. An asterisk (*) designates a quantitative problem, for which you should show all your work.
Discussion: A Flat Earth? A few relatively famous people have recently made the claim that Earth is flat. Working in small groups, first find out the basis on which they make these claims, then make a list of key observations that refute the flat Earth claims, then a make a list of key observations that refute the flat Earth claims. Based on what you learn, how can you tell which websites discussing, flat Earth claims are scientifically valid and which are not, and what lessons the flat Earth claims may contribute to the more general issue of “fake news” in our modern society?
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Chapter 3 Solutions
COSMIC PERSP.FUND.-MASTERING ASTRONOMY
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- Let's assume that the brightness of a field-emission electron gun is given by β = 4iB π² d²α² a) Assuming a gun brightness of 5x108 A/(cm²sr), if we want to have an electron beam with a semi-convergence angle of 5 milliradian and a probe current of 1 nA, What will be the effective source size? (5 points) b) For the same electron gun, plot the dependence of the probe current on the parameter (dpa) for α = 2, 5, and 10 milliradian, respectively. Hint: use nm as the unit for the electron probe size and display the three plots on the same graph. (10 points)arrow_forwardi need step by step clear answers with the free body diagram clearlyarrow_forwardNo chatgpt pls will upvotearrow_forward
- Review the data in Data Table 1 and examine the standard deviations and 95% Margin of Error calculations from Analysis Questions 3 and 4 for the Acceleration of the 1st Based on this information, explain whether Newton’s Second Law of Motion, Equation 1, was verified for your 1st Angle. Equation: SF=ma Please help with explaining the information I collected from a lab and how it relates to the equation and Newton's Second Law. This will help with additional tables in the lab. Thanks!arrow_forwardPlease solve and answer the problem step by step with explanations along side each step stating what's been done correctly please. Thank you!! ( preferably type out everything)arrow_forwardAnswer thisarrow_forward
- No chatgpt pls will upvotearrow_forwardNo chatgpt pls will upvote instantarrow_forwardKirchoff's Laws. A circuit contains 3 known resistors, 2 known batteries, and 3 unknown currents as shown. Assume the current flows through the circuit as shown (this is our initial guess, the actual currents may be reverse). Use the sign convention that a potential drop is negative and a potential gain is positive. E₂ = 8V R₁₁ = 50 R₂ = 80 b с w 11 www 12 13 E₁ = 6V R3 = 20 a) Apply Kirchoff's Loop Rule around loop abefa in the clockwise direction starting at point a. (2 pt). b) Apply Kirchoff's Loop Rule around loop bcdeb in the clockwise direction starting at point b. (2 pt). c) Apply Kirchoff's Junction Rule at junction b (1 pt). d) Solve the above 3 equations for the unknown currents I1, 12, and 13 and specify the direction of the current around each loop. (5 pts) I1 = A 12 = A 13 = A Direction of current around loop abef Direction of current around loop bcde (CW or CCW) (CW or CCW)arrow_forward
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