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breanna quir-s

breanna q.

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Problem 6: A heat engine takes in 2600 J of heat from a thermal reservoir at 580 K and performs 900 J of work per cycle. The waste heat is output at a temperature of 300 K. (a) How much energy is released as heat (output) from the heat engine (per cycle)? (b) What is the efficiency of this heat engine? (c) What is the efficiency of an ideal Carnot engine operating between these temperatures? (d) Suppose the high temperature (580 K) is increased. What new high temperature would make the Carnot efficiency be equal to 60% (0.60)?

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patient comes in with strep throat and a urinary tract infection. You choose to use two different antibiotics (one to treat each infection). After two days, you learn that the medications are effectively canceling each other and your patient is not getting better. This is a perfect example of: A) Commensalism B) Synergism C) Parasitism • D) Antagonism

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Question 6 [10 points] Solve the following system of linear equations: $x_1+3x_2+x_3 = 1$ $-x_1-3x_2-x_3 = -1$ $3x_1+9x_2+3x_3 = 3$ If the system has no solution, demonstrate this by giving a row-echelon form of the augmented matrix for the system. You can resize a matrix (when appropriate) by clicking and dragging the bottom-right corner of the matrix. The system has no solution Row-echelon form of augmented matrix: $\begin{bmatrix} 0 & 0 & 0 \\ 0 & 0 & 0 \\ 0 & 0 & 0 \end{bmatrix}$

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a) (5 points) What is the principle that the data structure stack must follow and what is the principle that a queue must follow? b) (5 points) What are the complexity of push and pop operations for a stack that is implemented based on the array? c) (5 points) What are the advantages of the array-based list and the linked lists? d) (5 points) In the worst case, what’s the complexity of removal from a linked-list and what’s the complexity of removal from an index-based list? (Hint: finish the reading task carefully)

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What is true of schizophrenia? The symptoms are not associated with other illnesses. Variants of many genes contribute to schizophrenia. Environmental factors can cause symptoms that mimic schizophrenia.

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The following program displays ________. public class Test { public static void main(String[] args) { String s = "Java"; StringBuilder buffer = new StringBuilder(s); change(s); System.out.println(s); } private static void change(String s) { s = s + " and HTML"; } } a. and HTML b. Java c. Java and HTML d. Nothing is displayed.

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You work in the quality control (QC) lab at a water treatment facility where you ensure that potential contaminants are below federal and state thresholds. The facility you are working at is interested in buying a new spectrophotometric instrument to test nitrate levels in water. Your team recently sent out the same standard samples for analysis by two different instrument manufacturers. The following table contains the measured signal for a series of 10 replicate measurements using the known standard on each instrument. Measurement Number Instrument 1 Instrument 2 (ppm) 1 4.22 4.70 2 5.43 4.81 3 4.57 4.65 4 4.11 4.68 5 5.89 4.89 6 5.02 4.50 7 4.53 4.55 8 3.74 4.62 9 4.83 4.87 10 4.32 4.78 a) What is the signal to noise ratio for each instrument of this standard sample? b) If you were given a choice, which instrument would you utilize? Why? c) How many measurements are required to improve the S/N ratio to S/N = 50 for instrument number 1?

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QUESTION 8 Which of the following is/are true about the pressure of a mixture of gases? A. The total pressure is the sum of all the partial pressures of each gas in the mixture B. The pressure is only affected by the heaviest gas in the mixture C. Each gas in the mixture exerts its own pressure D. A and B E. A and C QUESTION 9 Which of the following is the reducing agent in this reaction? Zn (s) + Cu$^{2+}$ (aq) ? Zn$^{2+}$(aq) + Cu (s) Cu (s) Zn (s) Zn$^{2+}$(aq) Cu$^{2+}$ (aq)

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Determine $I_x$ and $I_y$ for the image shown below. Given that $c = 0.72$ in. y $\leftarrow$0.5 in.$\rightarrow$0.5 in.$\rightarrow$ $\uparrow$ 0.25 in. $x$ $c$ $\downarrow$ 0.125 in. 0.125 in. The value of $I_x$ is ____ in.$^4$ and the value of $I_y$ is ____ in.$^4$

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Q4. Find $V_1$ and $V_2$, and write the answer in polar form.

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