What mass of potassium fluoride must be added to 500.0 mL of water to give a solution with pH = 8.07?

[K_a(HF) = 7.1 × 10^–4]

What domain expertise specific information is collected and organized during the problem definition step of a data mining spiral?

A beam of electrons is shot into a uniform downward electric field of magnitude 1.10 103 N/C. The electrons have an initial velocity of 1.11 107 m/s, directed horizontally. The field acts over a small region, 5.00 cm in the horizontal direction. (a) Find the magnitude and direction of the electric force exerted on each electron. magnitude 1.76e-16 N Correct: Your answer is correct. direction Correct: Your answer is correct. (b) How does the gravitational force on an electron compare with the electric force? The gravitational force is much smaller than the electric force. The gravitational force is much bigger than the electric force. Correct: Your answer is correct. (c) How far has each electron moved in the vertical direction by the time it has emerged from the field? (d) What is the electron's vertical component of velocity as it emerges from the field? (Up is the positive y-direction.) (e) The electrons move an additional 19.4 cm after leaving the field. Find the total vertical distance that they have been deflected by the field.

For this problem, carry at least four digits after the decimal in your calculations. Answers may vary slightly due to rounding.

In a marketing survey, a random sample of 998 supermarket shoppers revealed that 280 always stock up on an item when they find that item at a real bargain price.(a) Let p represent the proportion of all supermarket shoppers who always stock up on an item when they find a real bargain. Find a point estimate for p. (Round your answer to four decimal places.)


(b) Find a 95% confidence interval for p. (Round your answers to three decimal places.)

Give a brief explanation of the meaning of the interval.

5% of the confidence intervals created using this method would include the true proportion of shoppers who stock up on bargains.95% of the confidence intervals created using this method would include the true proportion of shoppers who stock up on bargains.    5% of all confidence intervals would include the true proportion of shoppers who stock up on bargains.95% of all confidence intervals would include the true proportion of shoppers who stock up on bargains.

(c) As a news writer, how would you report the survey results on the percentage of supermarket shoppers who stock up on items when they find the item is a real bargain?

Report the margin of error.Report p̂ along with the margin of error.    Report the confidence interval.Report p̂.

What is the margin of error based on a 95% confidence interval? (Round your answer to three decimal places.)

16.

–/5

For each of the reactions, calculate the mass (in grams) of the product formed when 15.86 g of the underlined reactant completely reacts. Assume that there is more than enough of the other reactant.

4Cr(s)+3O2(g)−−−−−→2Cr2O3(s)

M= g

2Sr(s)−−−−+O2(g)→2SrO(s)   

M= g

Marcia wants to keep track of each of her customers and their orders. Ultimately, she wants to notify them that their clothes are ready via email. Suppose that you have designed a database for Marcia’s Dry Cleaning that has the following tables:

CUSTOMER (CustomerID, FirstName, LastName, Phone, EmailAddress)

INVOICE (InvoiceNumber, CustomerID, DateIn, DateOut, Subtotal, Tax, TotalAmount)

INVOICE_ITEM (InvoiceNumber, ItemNumber, ServiceID, Quantity, UnitPrice, ExtendedPrice)

SERVICE (ServiceID, ServiceDescription, UnitPrice)

The referential integrity constraints are:

CustomerID in INVOICE must exist in CustomerID in CUSTOMER

InvoiceNumber in INVOICE_ITEM must exist in InvoiceNumber in INVOICE

ServiceID in INVOICE_ITEM must exist in ServiceID in SERVICE

Assume that CustomerID of CUSTOMER, EmployeeID of EMPLOYEE, ItemID of ITEM, SaleID of SALE, and SaleItemID of SALE_ITEM are all surrogate keys with values as follows: CustomerID Start at 100 Increment by 1

InvoiceNumber Start at 2018001 Increment by 1

D. Suppose that MArcia decides to allow multiple customers per order (e.g. for customers' spouses). Modify the design of these tables to accommodate this change.

E. Code SQL statements necessary to redesign the database, as described in your answer to question D.

F.Suppose that Marcia considers changing the primary key of CUSTOMER to (FirstName, LastName). Write correlated subqueries to display any data that indicate that this change is not justifiable.

Consider the following questions and provide your responses in the form of short answers. Be sure to apply your knowledge from the course thus far and use critical thinking to address these questions thoughtfully and thoroughly. If you use any external sources in your responses, be sure to cite them.

1. Define the term “globalization” and explain how advances in information technology have stimulated globalization. Describe recent events that provide evidence of globalization.
2. What is “the digital divide?” Describe the two fundamentally different dimensions of the digital divide.

sorry found a solution!

Do you think that having a government where employees demographically represent the population means that all voices have a shot of getting heard? Does having people who look like you in government increase your faith in government? Can a government official who comes from a different background advocate on your behalf?

At some instant, an alpha particle(q=+2e) has the coordinates(3.0,0.0,0.0)(nm) and is moving along the positive x-axis with 500km/s while an electron at (0.0,4.0,0.0)(nm) is moving along the negative y-axis with 1000km/s.
A)SHOW ALL WORK
Find the magnitude and direction of the total magnetic field at the location(3.0,4.0,0.0)(nm)
B)SHOW ALL WORK
Find the magnitude and direction of the magnetic forces felt by the electron and alpha particle.

A ladder is leaning against a vertical wall, and both ends of the ladder are at the point of slipping. The coefficient of friction between the ladder and the horizontal surface is μ1 = 0.295 and the coefficient of friction between the ladder and the wall is μ2 = 0.153. Determine the maximum angle with the vertical the ladder can make without falling on the ground.

IT Project Management:

1. Duration estimates are often provided as a discrete number, such as four weeks, or as a range, such as three to five weeks, or as a(n) ____________________.

2. Most projects have one path through a network diagram.

True or False

3. To make milestones meaningful, some people use the ____________________ criteria to help define them.

4. ____ involves analyzing activity sequences, activity resource estimates, and activity duration estimates to create the project schedule.

a. Estimating activity durations

b. Developing the schedule

c. Controlling the schedule

d. Estimating activity resources

5. ____ results in supporting detail to document important product information as well as assumptions and constraints related to specific activities.

a. Defining activities

b. Sequencing activities

c. Estimating activity resources

d. Estimating activity duration

*Answer must be in C*

Write a program as follows:

a- Define a structure type named "student" capable of storing the name of a student (string less than 15 characters long),

homework grade as float, and exam grade as a float.

b- Create an array of students named "cats" to store the info for 50 students.

c- Create a menu (and repeatedly display the menu) with three options:

option 1: enter the info for a student.

option 2: print the info of all students, do not print structures that have no hurricane data in them

option 3: exit program

d. write code to carry out each menu option

Regarding Operating Systems

Researchers have suggested that, instead of having an access control list associated with each file (specifying which users can access the file, and how), we should have a user control list associated with each user (specifying which files a user can access, and how). Discuss the relative merits of these two schemes.