Numerade

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pt) How much KCl (in grams) should be used to obtain a molarity of 0.5 in a 500 mL aqueous solution? (K = 39.1 amu, Cl = 35.43 amu)

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find an inverse of a modulo m: a) a=4 m=9, b) a=19 m=141, c) a=55 m=89, d) a=89 m=232

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14.Ms. Brown moves money from a saving account to buy US Treasury bills for US government. Then, (A) M1 decreases and M2 stays the same. (B) M1 stays the same and M2 increases. (C) MI increases and M2 stays the same. (D) M1 stays the same and M2 stays the same. (E) M1 decreased and M2 decreased.

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A positive 3 µC charge and a negative 3 µC charge is separated by 0.2 mm and is located at the origin as shown in the picture. What would be the direction of the net electric field at a point 13 cm from the origin? + 13 cm up Zero To the Left To right down

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Please neatly show all work, and circle, underline or highlight all answers. The gear shaft system transmits 40 H.P. and rotates at 1142 RPM. The Pitch is 5 and the Pressure Angle for all four gears is 20° and the shaft is 1.00 inches in diameter (Hint: Gear Diameter = Number of Teeth/Pitch) a. Determine the tooth loading $W_t$ and $W_r$ for each for gear pairs 1 and 2, and gears 3 and 4. (10 points) b. Determine the loading on the shaft due to the $W_r$ and $W_t$ gear forces and draw both top and front view Shear and Bending Moment diagrams (10 points) c. Using Mohr's circle, determine maximum stress seen in the shaft. Provide Principle Stresses 1 and 2 and Max Shear Stress only. Do not draw the Principle Stress or Max shear elements (unless you want to). (10 Points)

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An object is thrown from the ground into the air with a velocity of 1.0 m/s at an angle of 30.0Â° to the horizontal. What is the maximum height reached by this object? [2]

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Instructions: 1. Please answer all questions 2. The deadline to submit the exam is Friday (27/11/2020 3. Be sure that your answers are written clearly and can be read Q1: (2 points) 1. Define Requirement? Briefly explain five types of requirements 2. Differentiate between functional requirements and nonfunctional requirements. 3. Define goal? What is the difference between requirements and goal 4. List down three problems that we face when writing requirement in natural language? Q2: (3 points) Choose whether following statements are true or false 1. System requirement is a structured document setting out detailed descriptions of the system's functions, services and operational constraints 2. Ambiguous requirements may be interpreted in different ways by developers and users 3. Product requirements specify that the delivered product must behave in a particular way 4. Organizational Requirements arise from factors which are external to the system and its development process 5. Goal is a general intention of the user such as ease of use 6. Requirements amalgamation means several different requirements may be expressed together Q3: (2 points) Write 2 Functional Requirements and 2 Non-Functional Requirements for the following system Online shopping store

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Question 2 [40 points] Consider the following signal $X(e^{j\omega})$ $X(e^{j\omega}) = \frac{1}{1-\frac{1}{2}e^{-j\omega}} + 5e^{-j4\omega}$ a) Find $x[n]$, show all your works. [15 Points] b) If $y[n] = x[n] - x[n-1]$, Find $Y(e^{j\omega})$ you need to show all your calculation steps. [15 Points] c) Using your own words, explain your results in parts a and b above. [10 Points]

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1.0 Cu(acac)3 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 4000 3500 3000 2500 2000 1500 1000 500 Wavenumbers (cm-1)

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Total volume of buffer = 250 mL Acid used: Ammonium chloride Ratio in buffer: 0.52 Concentration of HA: 0.085 M Concentration of A-: 0.044 M Moles of HA: 0.02125 Moles of conjugate base: 0.011 What volume of reagents will you be mixing to create your assigned buffer? Amount of 1.0 M ammonium chloride = ? mL Amount of 1.0 M NaOH = ? mL

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michele r.