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The urinary system is the only system to contain excretory organs. true or false

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Question 2 Archaebacteria and Eubacteria are both missing which of these regions of a cell? O nucleus O cytoplasm and its organelles O phospholipid bilayer O deoxyribonucleic acid 2 pts

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The orderly sequence in the development of motor abilities from crawling to walking is a result of

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Use the following information to answer the next question During the formation of phosphorous trichloride, red phosphorous reacts with chlorine gas, accompanied by the following reaction: (Standard enthalpy of formatior of PCI3 -287.0 kJ/mol.) 2P(s) + 3CI2(g) -> 2PCI3(g) Enthalpy of products of a reaction is greater than enthalpy of the reactants Enthalpy of the products is less than enthalpy of the reactants Enthalpy of the products is equal to the enthalpy of the reactants Enthalpy of the products and reactants is zero none of the above

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For the problem below, draw a diagram representing the problem. In the diagram, label the right angle, given information, and use a variable for the quantity you are being asked to find. Then, set up an equation involving a trigonometric function, that when solved, determines the correct value of your variable. Solve the equation and approximate the value of your answer using a calculator to two decimal places. You can use Desmos (make sure the calculator is in degree mode). State your answer in a complete sentence and include units. Problem: A 23-ft ladder leans against a building so that the angle between the ground and the ladder is 40°. Determine how high the ladder reaches up the side of the building.

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This type of bond is considered to be a weak bond, but yet very important to living systems.

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Explain the working principle of a transformer and the role of mutual inductance.

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10:14 9231_w20_qp_22.pdf 7 (a) Show that \( \sum_{r=1}^{n} z^{2 r}=\frac{z^{2 n+1}-z}{z-z^{-1}} \), for \( z \neq 0,1,-1 \). \( [2] \) \( \qquad \) \( \qquad \) \( \qquad \) \( \qquad \) \( \qquad \) \( \qquad \) \( \qquad \) \( \qquad \) \( \qquad \) \( \qquad \) \( \qquad \) \( \qquad \) \( \qquad \) \( \qquad \) \( \qquad \) \( \qquad \) \( \qquad \) \( \qquad \) \( \qquad \) \( \qquad \) \( \qquad \) \( \qquad \) \( \qquad \) \( \qquad \) \( \qquad \) \( \qquad \) C UCL.ES 2020 \( 9231 / 22 / 0 / \mathrm{N} / 20 \) 9 (b) By letting \( z=\cos \theta+i \sin \theta \), show that, if \( \sin \theta \neq 0 \), \[ 1+2 \sum_{r=1}^{n} \cos (2 r \theta)=\frac{\sin (2 n+1) \theta}{\sin \theta} \] \( \qquad \) 9231_w20_ms_22.pdf C UCLES 2020 Page 12 of 16

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Texts: Please search for the following mortgage rates of a lender (e.g., a commercial bank, a credit union, etc.) in Canada: i. A two- or three-year fixed mortgage rate ii. A five-year fixed mortgage rate iii. A variable mortgage rate (a) Briefly explain the difference between a fixed-rate mortgage and a variable-rate mortgage. (Hint: Please Google the terms if you do not know them already.) (b) Please rank the three rates you found. (c) According to the ranking in (b), what are the market's expectations on future short-term interest rates? Please explain. (d) If you were to take a mortgage, which one would you prefer? Please explain your choice. (Hint: You should discuss under what expectations of future interest rates, you prefer one choice over the other two.)

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From the data below a. estimate the recovery, recrystallization, and grain growth temperatures b. Recommend a suitable temperature for a stress relief heat treatment. c. Recommend a suitable temperature for a hot-working process. d. Estimate the melting temperature of the alloy. Annealing Temperature Residual Yield Grain Stresses Strength Size (°C) (psi) (psi) (mm) 100 45,000 80,000 0.20 200 45,000 80.000 0.20 300 40,000 80,000 0.20 400 0 80,000 0.20 500 0 45,000 0.06 600 0 38,000 0.06 700 0 37,000 0.08 800 0 37,000 0.18

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