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steven johnson

steven j.

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The H$\alpha$ line is a prominent hydrogen spectral line often used by astronomers to measure redshift. For a source that is not moving, the wavelength of the H$\alpha$ line is 656.3 nm. Assume that a star is moving away from Earth at a velocity of 51.30 km s$^{-1}$. What change in wavelength ($\Delta\lambda$) will an astronomer on Earth measure for the H$\alpha$ line? Consider the speed of light, c, equal to 2.998 x 10$^{5}$ km s$^{-1}$. $\Delta\lambda$ = 0.1124 Correct Answer What is the new wavelength that the astronomer will measure for the H$\alpha$ line? Express the answer to the fourth decimal place. new wavelength: 656.4124 Incorrect Answer

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7 2 points Determine the reducing agent in the following reaction: $Sn^{4+} + Ca \rightarrow Sn^{2+} + Ca^{2+}$ $Sn^{2+}$ $Sn^{4+}$ Ca $Ca^{2+}$

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In 1998, a British medical doctor published a paper describing a case series of 12 children who were consecutively referred to a pediatric department with a history of developmental disorders and intestinal complaints. Of these, eight children were documented as having symptoms of autism which appeared within one month of receiving the measles-mumps-rubella (MMR) vaccine. (Wakefield, 1998) Which one of the following statements is true? Answers A-D A This study proves that MMR vaccines cause autism in British children. B The study is prospective. C This case series does not establish causality between MMR vaccination and onset of autism. D This study used randomization to limit bias.

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Figure Part A Determine the magnitude of the moment of the force \(F = \{50i - 21j - 80k\} \text{ N}\) about the base line AB of the tripod. (Figure 1) Express your answer to three significant figures and include the appropriate units. M_{AB} = \text{Value} \qquad \text{Units} Submit Request Answer Return to Assignment Provide Feedback Review

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Note: there are more than one correct answer. In this type, if you don't select all of the correct answers, the grading will be incorrect even your choice(s) is(are) correct (but not complete). $F_x = F\cos(360-35^\circ)$ $F_y = F\sin(360-35^\circ)$ $F_x = F\cos(35^\circ)$ $F_y = F\sin(35^\circ)$ $F_x = F\cos(35^\circ)$ $F_y = -F\sin(35^\circ)$ $F_x = F\sin(35^\circ)$ $F_y = F\cos(35^\circ)$ $F_x = F\cos(360-35^\circ)$ $F_y = -F\sin(360-35^\circ)$ $F_x = F\sin(35^\circ)$ $F_y = -F\cos(35^\circ)$

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Active transport allows the movement of solutes against this gradient by means of using pumps. The transporter proteins in membranes are _______ to use the movement of one solute down its gradient to provide the energy to drive the uphill transport of a second gradient. Group of answer choices electrochemically inert activated to the membrane potential coupled inactivated by cGMP

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Match the muscles with the compartment where it is located. Drag and drop options on the right-hand side and submit. For keyboard navigation...SHOW MORE Press space or enter to grab Deep Posterior Soleus Press space or enter to grab Lateral Tibialis Anterior Press space or enter to grab Anterior Gastrocnemius Press space or enter to grab Superficial Posterior Peroneal Longus

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x^2 - 1 \\ if \\ x > 1 \\ x - 1 is continuous on the entire real line. 7. Find an equation of the tangent line to the function f(x) = -3x^2 - 5x + 1 at the point (1, -7)

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QUESTION 2 An outbreak of Lumpy Skin Disease in cattle has provided the following results over an observation period of three (3) days: Type of cattle affected Disease Disease positive negative Total Meat 75 675 750 Dairy 20 230 250 Total 95 905 1.000 2.1 Provide the formula to calculate the prevalence of a disease. 2.2 With reference to the data tabled above, calculate the prevalence of Lumpy Skin Disease in: 2.2.1 meat cattle 2.2.2 dairy cattle 2.2.3 meat and dairy cattle combined 2.3. With reference to the data in the table above, calculate the proportion of: 2.3.1 meat cattle affected by Lumpy Skin Disease 2.3.2 Dairy cattle not affected by Lumpy Skin Disease

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PREVIEW ONLY - ANSWERS NOT RECORDED Problem 7. (1 point) Use the symbols provided below to sketch the phase line for the differential equation $x' = (x+4)(x-3).$ To place a symbol on the line click a symbol button then click a point on the line. To remove a symbol from the line click the "delete" button then click the symbol on the line. decreasing increasing equilibrium slope undefined delete < > ? | X Entered Answer Preview

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