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Jeff Moore

Jeff M.

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INSTANT ANSWER

A neutral water molecule \( \left(\mathrm{H}_{2} \mathrm{O}\right) \) in its vapor state has an electric dipole moment of magnitude \( 6.2 \times 10^{-30} \) C.m. a) How far apart are the molecule's centers of positive and negative charge? b) If the molecule is placed in an electric field of \( 1.5 \times 10^{4} \mathrm{~N} / \mathrm{C} \), what maximum torque can the field exert on it? c) How much work must an external agent do to rotate this molecule by \( 180^{\circ} \) in this field, starting from its fully aligned position, for which \( \theta=0 \) ?

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INSTANT ANSWER

A neutral water molecule \( \left(\mathrm{H}_{2} \mathrm{O}\right) \) in its vapor state has an electric dipole moment of magnitude \( 6.2 \times 10^{-30} \) C.m. a) How far apart are the molecule's centers of positive and negative charge? b) If the molecule is placed in an electric field of \( 1.5 \times 10^{4} \mathrm{~N} / \mathrm{C} \), what maximum torque can the field exert on it? c) How much work must an external agent do to rotate this molecule by \( 180^{\circ} \) in this field, starting from its fully aligned position, for which \( \theta=0 \) ?

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2. A body of mass 2kg is initially at rest on a horizontal surface. If a horizontal force of 25 pushesit Im, using work energy relationship, find the velocity.

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CityNew Orleans53Phoenix53Pittsburgh50San Francisco47Seattle46a) Compute the sample standard deviation for these datab) What is the 90% confidence interval estimate of the variance of car rental rate for the populationWhat is the 99% confidence interval estimate of the standard deviation for the population d) Wie summary based in your findings

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Q3) Haverty's Furniture is a family business that has been selling to retail customers in the Chicago area for many years. The company advertises extensively on radio, TV, and the internet. emphasizing low prices and easy credit terms. The owner would like to review the relationship. between sales and the amount spent on advertising Below is the data on sales and advertising expenses for the last five months:

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02) Older people often have a hard time finding work. AARP reported on the number of weeks it takes a worker aged 55 plus to find a job. The data on the number of weeks spent are given below:7,4, 10.9, 8, 7, 6, 5.3.2a) What is the point estimate of the population mean the number of weeks it takes a worker aged 55 plus to find a job?b) At 95% confidence, what is the margin of error?e) What is the 90% confidence interval estimate of the meand) Write a summary based on your findings

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a) Conenae the supie standard deization for these datn. popilatien e) What in the yoes comfidence inierval entimate of the mamdunt deriitian fot the popalation?

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Solution_I ecture Problems (Topulation Meaal Problem 01 A research firm conducted a survey to determine the mean amount steady senoluers spend en cigarettes during a week. They found the distribution of amounts spent per week followed a normal distribution with a population standard deviation of 55 . A sample of 49 steady smoluers revealed that the sample mean is 520 . a. What is the point estimate of the population mean? b. Develop a \( 90 \% \) confidence interval estimate of the population mean. c. Develop a \( 95 \% \) confidence interval estimate of the population mean. Solution:

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INSTANT ANSWER

A body is vibrating with simple harmonic motion of amplitudes 15 cm and frequency 4 Hz.Compute (a) Maximum value of the acceleration and velocity. [94.8 m/s², 3.77 m/s] (b) Acceleration and velocity when the coordinate is 9 cm. [56.9 m/s², 3.02 m/s](c) Time required to move a distance 12 cm from equilibrium position [0.0369 s]

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5. A steel piano wire 50 cm long of mass 5 g is stretched with a tension of 400 N.(a) What is its fundamental frequency? [200 Hz] (b) What is the number of the highest overtone that could be heard by a person who is capable of hearing frequencies up to 10000 Hz? [50]

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