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Q5. When a bicycle pedal is at the top of its motion, you can exert the greatest torque on the crank by A. pushing straight down on the pedal with your foot. B. pushing straight forward on the pedal with your foot. C. hooking your toes under the pedal and pulling upward. Q6. In a stable stack of identical boards at the edge of a table, the center of gravity of the top board A. must lie above the table. B. must lie above the next lower board. C. must lie above the bottom board. D. need not lie over anything. Q7. You stand with your heels against a wall and bend ninety degrees forward at the waist. A. You are able to maintain your balance. B. You fall forward because of the momentum you gain when you move. C. You fall forward because your center of gravity moves ahead of your base of support. D. You fall forward because the muscles in your feet aren't strong enough to stop you. Q8. A constant torque is applied to a flywheel. Which of the following mechanical quantities will be constant? A. rotational energy B. angular momentum C. rotational acceleration D. rotational velocity E. linear velocity of a particle on the rim Q9. In using a long steel rod as a lever to move a large rock, where should the fulcrum be placed? A. Halfway between the rock and the applied force. B. Close to the rock. C. Close the point where the force is applied. D. Anywhere in between - it makes no difference. Q10. Which of the following is an appropriate unit for describing rotational acceleration? A. m/s² B. rad/min C. rev/min D. rev/m/s E. rev/min² Q11. Torque in the metric system is measured in units of: A. N B. Ns C. Nrad D. N/m E. Nm

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4. Studies have shown that one stereoisomeric forms of compound E is an effective agent against certain types of neurodegenerative disorders. Recognize that structure E contains a decalin type system, as illustrated in structure F, and that the nitrogen can be treated just like a carbon. 8a ΝΗ HO NH 6 3 P HO 4a CO2H E F a) Use your model kits to analyze the ring juncture. Make models of the cis as well as the trans ring juncture of structure F. You should have four different models. Identify the stereochemical relation between them as diastereomeric or enantiomeric. Draw the isomers and assign the R and S configuration to the stereocenters at the ring fusion. b) Although the trans ring juncture is the energetically more favorable one, the compound with cis ring juncture is the stereoisomer of structure E that shows biological activity. Make models of structure E that have the cis ring juncture exclusively. Set the stereochemistry of C3 as shown in structure E and vary the center at C6 in relation to that at C3. Again, there are four different models. Draw them and convince yourselves that none of them are enantiomers by assigning the R or S configuration to all four of the stereocenters in each of the compounds. c) The stereoisomer of compound E that shows the greatest biological activity has a cis ring fusion with substituents at C3 and C6 that are both equatorial. Which of the stereoisomers that you drew encompasses these constrains? Identify it by recording the absolute configuration at C3, C4a, C6, and C8a.

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How does the Hartmann hypothesis critique the continuity hypothesis? Suggests dreams don't contain much cognitive activity Suggests dreams continue from waking life Suggests dreams are intended to regulate emotions None of the above

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Problem 4 A soap bubble of refractive index $n_{soap} = 1.40$ appears yellow when viewed perpendicular to its surface (yellow = white - blue, where $\lambda_{blue} = 440nm$ in a vacuum). A. Does the light change phase when reflected from the outside surface of the bubble? B. Does the light change phase when reflected from the inside surface of the bubble? C. Calculate the wavelength of blue light when passing through the bubble. D. Determine the thickness t of the thinnest bubble for which the blue light reflected from the outside surface of the bubble interferes destructively with light reflected from the inside surface (creating the yellow fringe)

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Solve the system using any method -x + y + z = 7, 4x - 3y - z = -22. x + y + z = 1 Your answer is x = y = z =

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Lab2- Mesh Analysis Instructions: Unless otherwise stated, solve for the mesh currents in the following circuits 1. 6 Ohm 12 Ohm 4 Ohm +40V 12V 24V 2. 8 Ohm 191V 100V 4 Ohm 15V 6 Ohm 3 Ohm 5 Ohm 74V 7 Ohm 23V 150V

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The national distribution of fatal work injuries in a country is shown in the table to the right under National %. You believe that the distribution of fatal work injuries is different in the western part of the country and randomly select 6231 fatal work injuries occurring in that region. At $\alpha = 0.10$ can you conclude that the distribution of fatal work injuries in the west is different from the national distribution? Complete parts a through d below. Cause National % Western Frequency Transportation 43% 2895 Equipment 17% 1156 Assaults 15% 803 Falls 14% 755 Harmful fumes 9% 534 Fires 2% 86 The distribution of fatal work injuries in the west differs from the expected distribution. Which hypothesis is the claim? $H_0$ $H_1$ b. Determine the critical value, $\chi^2_0$, and the rejection region. $\chi^2_0 = $ (Round to three decimal places as needed.)

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EGN 3365 Structure and Properties of Materials Homework #4 Due end of day Thursday, March 18, 2021, online 500 400 300 stress (MPa) 200 100 0.002 0.004 0.006 0.008 0.01 0.012 0.014 strain From the above stress-strain curve, determine the: (a) elastic modulus (b) 0.2% offset yield strength (c) ultimate tensile strength (d) % elongation at failure (ductility) 2. Corrected_text: A steel bar 100 mm long and having a square cross-section 20 mm on each edge is pulled in tension with a load of 89,000 N and experiences an elongation of 0.10 mm. Assuming that the deformation is entirely elastic, calculate the elastic modulus of steel. Give your answer in GPa. 3. Corrected_text: A zinc single crystal is being pulled in tension with the normal to its basal plane (0001) at 60Â° to the tensile axis and the slip direction [1120] at 40Â° to the tensile axis. What is the resolved shear stress, t, acting in the slip direction when a tensile stress of 0.690 MPa is applied? 4. Corrected_text: An alloy is evaluated for potential creep deformation in a short-term laboratory experiment. The creep rate is found to be 1% per hour at 800Â°C and 5.5 x 10^-2 % per hour at 700Â°C. (a) Calculate the activation energy for creep in this temperature range. (b) Estimate the creep rate to be expected at a service temperature of 500Â°C. (c) What important assumption underlies the validity of your answer in (b)? 5. Corrected_text: A cylindrical specimen of a hypothetical metal alloy is stressed in compression. If its original and final diameters are 30.00 and 30.04 mm, respectively, and its final length is 105.20 mm, compute its original length if the deformation is totally elastic. The elastic and shear moduli for this alloy are 65.5 and 25.4 GPa, respectively.

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The electric potential changes by 7 V from point A to point B in a certain electric field. If a -0.032 C charge is moved from point A to point B, how much work is done by the field?

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The current price for a futures contract that matures in 283 days is CAD1.46/EUR. The size for a futures contract on EUR is EUR 125,000 and the futures price has risen to CAD1.466/EUR by the close of trading. If you own 7 futures contracts, how much can you gain under marking to market? a. 5250 b. 875000 c. 1277500 d. 4127 e. 1282750

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amanda c.