Numerade

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A heavy rope, 40 ft long, weighs 0.3 lb/ft and hangs over the edge of a building 110 ft high. (Let x be the distance in feet below the top of the building. Enter xi* as xi.) (a) How much work W is done in pulling the rope to the top of the building?

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a 2.32 g sample of Na2SO4 nH2O yields 1.42 g Na2SO4 upon heating. What is the value of n?

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What is the pH of a buffer system prepared by dissolving 10.70 grams of NH4Cl and 25.00 mL of 12 M NH3 in enough water to make 1.000L of solution? Kb = 1.8x10-5 for NH3

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The IR spectrum of a compound shows only two intense (large) peaks--one at 1100 cm$^{-1}$ and a broad one at 3300 cm$^{-1}$. Which structure below is the most likely structure for this compound? OH ~~~A~~~~B~~~~C~~~~D Question 5 One of the compounds in Question #4 shows an intense peak in its IR spectrum around 1715 cm$^{-1}$, but no significant peaks above 3100 cm$^{-1}$. Which compound is it?

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Why is it necessary to charge the sample when taking SEM (Scanning Electron Microscopy) and TEM (Transmission Electron Microscopy) images? Why does the imaging chamber need to be in a vacuum environment when capturing SEM and TEM images?

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When buying a Pokemon booster pack, there is a 3.29% chance that it contains a foil card. When buying 35 booster packs, what is the probability of getting at least 5 packs with a foil card? Provide an answer accurate to 4 decimal places.

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V On the low-speed airfoil diagram below CLEARLY label the items listed in A, B, C, D (I must be able to easily understand what you are showing me!) A) Draw the chord line clearly labeling it. B) Draw the mean camber line clearly labeling it C) Show and label the angle of attack. D) Draw the Lift and Drag vectors clearly labeling what directions they are perpendicular to.

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Written Assignment: Show all your work and submit problems 7-10 as written assignment. 7. [1pt] Show that the radial wave function $R_{20}$ for $n = 2$ and $l = 0$ satisfies Equation (7.13). What energy results? Is this consistent with the Bohr model? 8. [1pt] Show that the radial wave function $R_{21}$ for $n = 2$ and $l = 1$ satisfies Equation (7.13). What energy results? Is this consistent with the Bohr model? 9. [1pt] Show that the radial wave function $R_{21}$ for $n = 2$ and $l = 1$ is normalized. 10. [1pt] The wave function for the ground state of hydrogen is given by $\psi_{100} (r, \theta, \phi) = Ae^{-r/a_0}$ Find the constant A that will normalize this wave function over all space.

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Baer & Baer sells knitted caps for children. The company plans to price the caps at 75% above cost. What price should be charged for a cap that cost the company $8? $8*.75 $8*.25 $8*.075 ($8*.075)+$8 None of the above

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6. (20 points) A beam and its cross section are shown below. At a section, A-A, the resisting vertical shear force, $V_r$, is 5 kN (upward). a. Determine the vertical shear stress at point $b$ b. Show this stress on the cross section. Note: $\tau_H = \frac{V_rQ}{I_t}$ $I = \frac{bh^3}{12}$

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luke a.