Numerade

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Which member of the following pairs is the stronger acid?Give reasons for your choice. A) [Al(H2O)6]3

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Question 05 a) A manufacturer sells a certain article in batches of 5000. By agreement with a customer the following method of inspection is adopted: A sample of 100 items is drawn at random from each batch and inspected. If the sample contains 4 or fewer defective items, then the batch is accepted by the customer. If more than 4 defectives are found, every item in the batch is inspected. If inspection costs are 75 p per hundred articles, and the manufacturer normally produces 2% of defective articles, find the average inspection costs per batch. b) The number of failures occurring in a machine of a certain type in a year has a Poisson distribution with mean 0.4. In a factory there are ten of these machines. i. What is the expected total number of failures in the factory in a year? ii. the probability that there are fewer than two failures in the factory in a year?

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The cell membrane is made of proteins. nucleotides. water. proteins and phospholipids. phospholipids.

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Suppose a new technology is discovered in Econland, and taxes have decreased recently. The most likely outcome in Econland is Group of answer choices Lower unemployment and more output (Real GDP) Lower inflation rates Higher inflation rates Higher unemployment and less economic output (Real GDP)

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Time left 1:40:16 Quiz r Time (s) If the ground level is the reference point, the amplitude and median of the sinusoidal function are respectively, Select one: a. 60 and 60 b. 120 and 75 c. 120 and 135 d. 60 and 75. A mass is attached to a hanging spring during a physics experiment. A motion sensor records the height of the mass above a table as it oscillates up and down. A Time (s) 0 0.25 0.5 0.75 1.0 1.25 1.5 Height (cm) 18 14 10 14 18 14 10 The height of the mass above the table as a function of time can be modeled by a sinusoidal regression. The period of this function, to the nearest second, is 5 12 L

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Distance between device and appliance (cm) 1.5 0.5 1 Bolt Machine Motion 2 Time (s) 3 3. The motion of an automated device for attaching bolts to a household appliance on an assembly line can be modelled by the graph shown at the left. a) What is the period of one complete cycle? b) What is the maximum distance between the device and the appliance? c) What is the range of this function? d) If the device can run for five complete cycles only before it must be turned off, determine the domain of the function. e) Determine the equation of the axis. f) Determine the amplitude. g) There are several parts to each complete cycle of the graph. Explain what each part could mean in the context of "attaching the bolt."

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30. IGCSE Maths Extended Assignment 1 Without using your calculator, work out $2\frac{1}{2} \div \frac{5}{6}$ Give your answer as a fraction in its lowest terms. You must show each step of your working $\frac{25}{2} \times \frac{6}{5}$ $\frac{5 \times 6}{2 \times 1} = \frac{30}{2}$ $\frac{10}{3} = 3\frac{1}{3}$ 31. Fritz drives a distance of 381 km in 2 hours and 18 minutes. He then drives 75 km at a constant speed of 30km/h. Calculate his average speed for the whole journey. Answer _____________ km/h [4]

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PROBLEM 1.2 A very thin metallic sheet is placed between two wood plates of different thicknesses. The plates are firmly pressed together and electricity is passed through the sheet. The exposed surfaces of the two plates lose heat to the ambient fluid by convection. Assume uniform heating at the interface. Neglect end effects and assume steady state. [a] Will the heat transfer through the two plates be the same? Explain. [b] Will the exposed surfaces be at the same temperature? Explain. (1) Observations. (i) The electric energy generated in the metallic sheet is transferred outwardly through the two wood plates. (ii) Since the plates are of identical material but of different thicknesses, it follows that this is an asymmetrical problem. (iii) According to Fourier's law of conduction, material thickness plays a role in the rate of heat conducted. (iv) Heat is removed from the exposed surfaces by convection to the surroundings.

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If $E_1 = 120V$, $R1 = 1.2k\Omega$, $R2 = 1.2k\Omega$, $R3 = 1.2k\Omega$, $R4 = 1.2k\Omega$, $R5 = 1.2k\Omega$, write mesh equations and simplify them. Select one: a. $3i_1 - i_2 - i_3 = 10$ $-i_1 + 2i_2 - i_3 = 1$ $-i_1 - i_2 + 3i_3 = 0$ b. $3i_1 - i_2 - i_3 = 0$ $-i_1 + 2i_2 - i_3 = 0.1$ $-i_1 - i_2 + 3i_3 = 0$

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Discussion Section 6. Provide a detailed discussion written in past tense, impersonal and paragraph form interpreting all of the results. Discuss the solubility of benzoic acid in water at low temperature (near 0 °C in the ice- water bath) and at elevated temperature (near 100 °C in boiling water). Explain why water is a good solvent for benzoic acid recrystallization. Discuss the experimental %recovery. Explain why the %recovery must be less than 100% the mass of impure benzoic acid. How could the %recovery be improved? If the %recovery was equal to, or greater than, 100%, explain why. Discuss the appearance of the benzoic acid before and after recrystallization. Does the appearance suggest different purity? What should pure benzoic acid look like? Include all other relevant discussion regarding the experiment. Use additional pages as necessary. (4 points)

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andres f.