Saturday

October 10, 2015
Total # Posts: 832

**Physics**

Two blocks move along a linear path on a nearly frictionless air track. One block, of mass 0.120 kg, initially moves to the right at a speed of 4.90 m/s, while the second block, of mass 0.240 kg, is initially to the left of the first block and moving to the right at 7.40 m/s. ...
*October 18, 2012*

**math**

a social security number contains nine digits such as 074-66-7795. how many different social security numbers can be formed?
*October 4, 2012*

**stats**

1. Find the sample variance and standard deviation 6, 53,11,49,35,26,28,28,31,31 s squared = (round to the nearest hundredth as needed)
*October 2, 2012*

**math**

3B216 + 2B316 =
*September 26, 2012*

**math**

Divide 332 by 2 (base 4)
*September 26, 2012*

**Math**

Thanks Steve
*September 25, 2012*

**Math**

please convert decimal numbers to binary 32.75 10th power
*September 25, 2012*

**economics**

1. Suppose that as the price of Y falls from $3.00 to $1.00 the quantity of Y demanded increases from 10 to 18. Compute the price elasticity of demand. Is the demand elastic or inelastic?
*September 24, 2012*

**Math**

Let p -> q represent the conditional statement All hummingbirds love nectar. This is equivalent to p = If it is a hummingbird and q = then it loves nectar. State your answers to the questions below both in words and in symbols. 1. What is the contrapositive of this ...
*September 17, 2012*

**Math**

Please I am having a hard time with these. Let p be: it is wrong to smoke in public Let q be: secondary cigarette smoke is a health threat Let r be: the American Lung Association says that secondary cigarette smoke is a health threat Can you answer these questions? A. What ...
*September 17, 2012*

**math**

Equivalencies If A, then B is equivalent to If not B, then not A Not (A and B) is equivalent to not A OR not B Not (A or B) is equivalent to not A AND not B Can you give an equivalent statement to 1. If an Iowa farmer does not grow corn or beans, then he grows alfalfa. 2. It ...
*September 12, 2012*

**Math**

Thank you Ms Sue. I was scrolling through the thread and my eyes where bugging out
*September 12, 2012*

**Math**

Is there a way to get an message or I have to scroll through these Maths to find me because I can't find mine
*September 12, 2012*

**math**

If A, then B is equivalent to If not B, then not A Not (A and B) is equivalent to not A OR not B Not (A or B) is equivalent to not A AND not B Can you give an equivalent statement to 1. If an Iowa farmer does not grow corn or beans, then he grows alfalfa. 2. It is not true ...
*September 9, 2012*

**math**

What is the negation for these Original……-> Negation Some are....---->None are Some are not--->All are All are... ---> Some are not None are..---->Some are 1. Some basketball players are tall. 2.All roses are flowers. 3. No dogs are cats. Some ...
*September 9, 2012*

**math**

Can you each make up an example in which "Some A are not B" is true, but the statement "Some B are not A" is false? An example would be "Some dogs are not poodles" is true but "Some poodles are not dogs" is false
*September 9, 2012*

**math**

if the universal set U is defined by U={1,2,3,4,5,6,7,8,9,10}and A={1,2,3,4} B={3,4,5,6,7} what is contained in A n B'=the intersection of A and B'?
*September 9, 2012*

**Statistics**

(TCO A) Consider the following age data, which is the result of selecting a random sample of 20 United Airlines pilots. 47 45 45 52 58 55 58 44 42 38 45 52 48 47 51 45 52 42 37 40 a. Compute the mean, median, mode, and standard deviation, Q1, Q3, Min, Max for the above sample ...
*September 6, 2012*

**math**

Find the x-intercept and y-intercept for y=-5+1
*September 4, 2012*

**Statistics**

A conservative correction method for inflated "Alpha values" based on multiple comparisons being carried out independently on a specific data set, is known as...? A. Ad Hoc Testing B. Tukey's honestly significan differences (HSD) C. Post Hoc testing D. Bonferroni...
*September 2, 2012*

**Statistics**

In conducting multiple regression analyses (MRAs), a major technical concern involves any high correlation of predictor (regressor) variables included in the model. The term for this is ....? A. Redundant predictors B. Close "knit" IVs C. Multicollinearity D. ...
*September 2, 2012*

**Statistics**

Parametric procedures of quantitative analysis make an underlying assumption that...? A. Dichotomous variables have been "smoothed" B. The variables are measured at least at an ordinal level. C. All responses are measured in a mutually exclusive manner D. The ...
*September 2, 2012*

**Statistics**

Analysis of Variance (ANOVA) results in the calculation of the F Statistic and interpretation of this statistics will inform you as to...? A. Which means significantly differ from the others. B. How the variables are associated with each other. C. Whether one or more of the ...
*September 2, 2012*

**Statistics**

To make causal inferences from observed differences between groups based on varied levels of treatment, it is necessary to...? A. Find significant differences between groups at at-least the .05 level B. Use T-test or ANOVA procedures to conduct the analysis C. Have random ...
*September 2, 2012*

**Statistics**

When conducting an inferential statistical analysis, and applying a conventional "critical p-value" of .05, the odds of making a Type I Error and "rejecting a true Null Hypothesis" is? A. 1 in 30 B. 1 in 100 C. 1 in 20 D. 1 in 10
*September 2, 2012*

**statistics**

What would a person's numerical score be if someone scored two Standard Deviations above the Mean on a standardized test where the Mean = 100 and the Standard Deviation =15?
*August 30, 2012*

**statistics**

What formula is used to calculate the Standard Error of Measurement?
*August 30, 2012*

**statistics**

What do independent trials in relationship to probability theory mean?
*August 30, 2012*

**statistics**

A "Set" within quantitative theory represents ...?
*August 30, 2012*

**statistics**

What particular measure of correlation would be most appropriate for use with two variables measured at an ordinal level?
*August 30, 2012*

**math**

what is the correct order of operations for calculations of basic math problems?
*August 30, 2012*

**statistics**

What are the defining characteristics of the Ratio Level of Measurement?
*August 30, 2012*

**chemistry**

how much heat is released wen 10g of steam at 100 degrees c is cooled to 10g of liquid water at 100degrees c?
*August 29, 2012*

**english**

In Great expectations, how is pip different from the convict in chapter l?
*August 19, 2012*

**Algebra2**

Are these right?! Absolute value : 1. |x^2-2x+16|=8 x=-4 x=-3 x=-2 x=2 2.|3x-2|=7 x=5\3 x=3 3. |3x+2|+3=0 x= -5/3
*August 16, 2012*

**math**

Equivalencies?? If A, then B is equivalent to If not B, then not A Not (A and B) is equivalent to not A OR not B Not (A or B) is equivalent to not A AND not B Can you give an equivalent statement to 1. If an Iowa farmer does not grow corn or beans, then he grows alfalfa. 2. It...
*August 10, 2012*

**Financial Planning**

What are the long term and short term effects of credit and debt?
*July 26, 2012*

**Statistics**

n1-25, n2-36, s1 power 2=50, s2 2 power=72, m1=100. m2=105
*July 23, 2012*

**math**

wheels are 1.25 inches in diameter and the fastest speed is 3ft/second maximum distance to travel is 16 x (18cm)
*July 19, 2012*

**maths**

20. Marie can afford a $250 per month car payment. She’s found a 5 year loan at 7% interest. a. How expensive of a car can she afford? b. How much total money will she pay the loan company? c. How much of that money is interest?
*July 18, 2012*

**porpotions**

Carlos goes to a local deli for lunch and orders a sandwich. He needs to choose a bread, a meat, a vegetable, a cheese, and a sauce. How many sandwich combinations are possible? Assume Carlos always picks only one item from each category. Bread: Italian, rye, wheat, white, ...
*July 6, 2012*

**Statistics**

A study was conducted in order to estimate u, the mean number of weekly hours that U.S. adults use computers at home. Suppose a random sample of 81 U.S. adults give a mean weekly computer usage time of 8.5 hours and that from prior studies , the population standard deviation ...
*June 25, 2012*

**Statistics**

How large a sample of U.S. adults is needed in order to estimate U with a 95% confidence interval of length 1.2 hours?
*June 25, 2012*

**math**

what does it mean to describe the context in which a equation is used. describe the meaning of a equation and the meaning of the variables.what is meant by solution of a equation. my equation is y=2x+3
*June 9, 2012*

**microeconomics**

Individuals in a market who must take the market price as given are?
*June 9, 2012*

**PHYSICS**

1. A 500.0 g metal block absorbs 1.125 × 104 J of heat to raise its temperature by 50.0 K. What is the substance?
*June 5, 2012*

**PHYSICS**

If you increase the distance between two identical point charges so that the new distance is five times the original distance, what happens to the force between them? I know it is suppose to be divided by 25 but why?
*June 4, 2012*

**maths**

Five members of staff had their till sales analysed. Andrew scored higher than Amanda who didn`t have the lowest score. Angela had the highest score and Sally scored more than David but less than Andrew. Who had the lowest score?
*June 4, 2012*

**Physics**

Before a nuclear reaction, there is 0.01000 kg of uranium. After the nuclear reaction, there is 0.00950 kg of uranium. How much energy was released? (h = 6.63 × 1034 Js)
*June 1, 2012*

**Physics**

Two objects are near a bar magnet. One is about 1 cm away, while the other is 6 cm away. Compare and contrast the magnetic force that affects each object. What do they want me to do?
*May 27, 2012*

**Physics**

The minimum frequency for the photoelectric effect of a zinc plate is 9.7 × 1014 Hz. What will be the kinetic energy of an ejected electron when a photon with a wavelength 200 nm (2.00 × 10 7 m) strikes it?
*May 27, 2012*

**Honors Physics Question**

Two objects are near a bar magnet. One is about 1 cm away, while the other is 6 cm away. Compare and contrast the magnetic force that affects each object. What do they want me to do?
*May 27, 2012*

**PHYSICS**

A coil with an area of 0.10 m2 is in a magnetic field of 0.20 T perpendicular to its area. It is flipped through 180° so that the part that was up is down. The flip takes 1.0 s. Estimate the average induced emf between the ends of the coil while it is being flipped. What ...
*May 27, 2012*

**PHYSICS**

A straight 1.2 m length iron rod is moved at 10 m/s through the earth's magnetic field at a location where it has magnitude 1.0 × 105 T. What is the magnitude of the induced emf between one end of the wire and the other end? What formula do I use?
*May 27, 2012*

**physics**

A wire loop has an area of 0.12 m2, and the magnetic field through it increases from 0 to 0.20 T in 0.30 s. What is the induced emf in the loop?
*May 27, 2012*

**Physics**

According to Boyle's law, the volume V of a gas at a constant temperature varies inversely with the pressure P. When the volume of a certain gas is 125 cubic meters, the pressure is 20 psi (pounds per square inch). If the volume of gas is increased to 400 cubic meters, the...
*May 25, 2012*

**physics**

current through a device is 0.30 A, and the resistance in the device is 40 Ù. How many 1.5 V batteries are required to run the device
*May 24, 2012*

**Physics**

each resistor in the circuit shown is 5.0 Ù, and the battery is 12.0 V, what does the second ammeter (A2) read?
*May 24, 2012*

**Change boring verb and ordinary adjectives**

bill get angry with his sister
*May 23, 2012*

**physics**

A boy drops a 0.10 kg stone down a 150 m well and listens for the echo. The air temperature is 20°C. How long after the stone is dropped will the boy hear the echo? The speed of sound through air at 20°C is v = 343 m/s.
*May 21, 2012*

**Lost in Physics**

The strength of an electric field at 5.0 cm from a point charge is 100.0 N/C. What is the magnitude of the source charge? Show work so I understand how to do it. E=kQ/r^2 solve for Q, you have r, E What do I do NOW? I am lost
*May 19, 2012*

**Physics**

Calculate the force between a +5 µC test point charge and this source charge at a distance of 2.00 cm. (µC = 1.0 × 10–6 C) force=kq1q2/r^2 Have the formula now what do I do?
*May 19, 2012*

**Physics**

A 5.0 µC point charge is moved within an electric field and has an electric potential energy change of 10.0 J. What is the electric potential difference before and after the charge was moved? Show work. (µC = 1.0 × 10–6 Vq=energy so delta V must be 10 ...
*May 19, 2012*

**Physics**

If the test charge were moved closer to the source charge, would the change in its potential energy be positive, negative or zero? Explain.
*May 19, 2012*

**Physics**

Calculate the force between a +5 µC test point charge and this source charge at a distance of 2.00 cm. (µC = 1.0 × 10–6 C)
*May 19, 2012*

**Physics**

A 5.0 µC point charge is moved within an electric field and has an electric potential energy change of 10.0 J. What is the electric potential difference before and after the charge was moved? Show work. (µC = 1.0 × 10–6 C)
*May 19, 2012*

**Physics**

If I knew how to do it with formula I would have done it.
*May 19, 2012*

**Physics**

The strength of an electric field at 5.0 cm from a point charge is 100.0 N/C. What is the magnitude of the source charge? Show work so I understand how to do it.
*May 19, 2012*

**chem**

What volume of a 2.5 M stock solution of acetic acid (HC¿HÀO¿) is required to prepare 100.0 milliliters of a 0.50 M acetic acid solution?
*May 10, 2012*

**Math**

Determine the total amount of interest you will pay over the next 3 months on a credit balance of $725 if your credit card has an annual interest rate of 18% and you make monthly payments of 10% of the amount due, rounded to the nearest dollar.
*May 7, 2012*

**Chemistry**

When a mixture of sulfur and metallic silver is heated, silver sulfide is produced. What mass of silver sulfide is produced from a mixture of 3.0 g Ag and 3.0 g S8? 16 Ag(s) + S8(s) > 8Ag2S(s)
*May 6, 2012*

**Chemistry**

yes
*May 6, 2012*

**Chemistry**

This is all the info I have DrBob222 I don' have a solubility table. It doesn't say how much solution either,huh, is this something that can be answered?
*May 6, 2012*

**Chemistry**

Thank you DrBob222 for your help!
*May 6, 2012*

**Math**

A spinner is divided into 20 equal sections and are numbered 1 through 20. What is the probability of the spinner's pointer landing on section 5?
*May 5, 2012*

**Math**

In 2004, your family bought a new car for $15,000. Each year the value of the car is decreasing approximately 15% per year. Your father plans to keep the car 5 years before he buys another new car. What will be the value of the car when he's ready to trade? What is the ...
*May 5, 2012*

**english**

which of the following is a simple sentence? a)karen and david arrived at the airportat 3:35pm and took a taxi to their hotel b)i went to the airport ,but i was too late to meet them
*May 1, 2012*

**social studies **

Which of the following statements should not be included in the general principles of self-evaluation in a child care facility? A. The knowledge that a self-evaluation is taking place should be restricted to the program director. B. Self-evaluation should take place at regular...
*April 30, 2012*

**statistics**

A TV pollster believes that 75% of all TV households would be tuned in to Game 6 of 1997 NBA Championship series between the Chicago Bulls and the Utah Jazz. A sample of 1000 TV households was selected and 722 indicated they were tuned into the game. Find the Standard Error ...
*April 18, 2012*

**Math**

$1000 in a savings bond on the day you were born. The bond pays 6% interest compounded annually. How much is it worth in 18 yrs? I know it earns $60 a yr. but I am lost after that.
*April 18, 2012*

**statistics**

A TV pollster believes that 75% of all TV households would be tuned in to Game 6 of 1997 NBA Championship series between the Chicago Bulls and the Utah Jazz. A sample of 1000 TV households was selected and 722 indicated they were tuned into the game. Find the point estimate ...
*April 17, 2012*

**Math**

You invest $7,000 in a two-year CD. At the end of the 2 years, you receive $8,331.97. Assume you left the first year' s interest in the account, what was your yearly interest rate?
*April 10, 2012*

**English**

Reminds me of movie and a book I read!
*April 10, 2012*

**statistics**

The time it takes Jessica to bicycle to school is normally distributed with an average of a third of an hour and a variance of 9 minutes. Jessica has to be at school at 8:15 am. What time should she leave the house so she will be late on 5% of the time?
*March 27, 2012*

**statistics**

An agricultural economist is interested in determining the average diameter of peaches produced by a particular tree. A random sample of 50 peaches is taken and the sample mean calculated. Suppose that the average diameter of peaches on this tree is known from previous years&#...
*March 26, 2012*

**statistics**

the dean of admissions in a large university has determined that the scores of the freshman class in a mathematics test are normally distributed with a mean of 86 and a standard deviation of 11. A sample of 50 students is selected at random from the entire freshman class. ...
*March 26, 2012*

**Physics**

You have a 2.00 kg block of lead. Lead melts at 327.5Â°C. CPb = 130.0 , and ï„Hf for lead is 2.04 Ã— 104 J/kg. Say you start at room temperature (25.0Â°C). How much heat must you transfer to melt all the lead?
*March 18, 2012*

**math**

if one boy runs 2 3/5 miles a day for 4 days and another boy runs 10 miles in 4 days who runs further?
*March 15, 2012*

**Physics**

A 500.0 g metal block absorbs 3.25 × 103 J of heat to raise its temperature by 50.0 K. What is the substance? Please show steps because I have several problems like this and then I can see where I am goibg wrong
*March 12, 2012*

**math**

what is rule for a function table that has input/output 12/0 20/2 32/5 52/10
*March 8, 2012*

**physical Science**

t=(v-vo)/a v=100m/sx10 a=9.81m/sx2
*February 29, 2012*

**Physics**

3. A 0.200 kg air-track glider moving at 1.20 m/s bumps into a 0.600 kg glider at rest. a.) Find the total kinetic energy after collision if the collision is elastic. .144J I got that one. b.) Find the total kinetic energy after collision if the collision is completely ...
*February 28, 2012*

**chemistry 111**

in calibrating your thermometer by setting only the freezing and boiling points, what assumptions are you making regarding the internal diameter of the thermometer and the expansion of the thermometer fluid?
*February 26, 2012*

**Math**

The Robinsons decide they would rather purchase the $85,000 home. Their bank requires a 5% down payment to be paid to the seller and a payment of 1 point (1%) of the mortgage at the time of closing. How much is the down payment?
*February 25, 2012*

**statistics**

If the means for our groups on calories consumed a day were Group A = 2000, Group B = 2500, and Group C = 3000 could we just assume that all of the groups had statistically different means? How could we determine which groups were significantly different from each other?
*February 24, 2012*

**chemistry**

Calculate the number of moles in each of the following: 0.150 g of salicylic acid 0.30 mL of acetic anhydride (density = 1.08 g/mL)
*February 24, 2012*

**math**

how to find the volume when two figures are used?
*February 20, 2012*

**Physics**

I am still lost! I understand the formula I just don't know what numbers to put where.
*February 12, 2012*

**Physics**

A girl places a stick at an angle of 60.0° against a flat rock on a frozen pond. She pushes at an angle and moves the rock horizontally for 2.00 m across the pond at a velocity of 4.00 m/s and a power of 160.0 W. What force did she apply to the stick? How much work did she...
*February 12, 2012*

**Physics**

A man weighing 700 N lifts a 50.0 N object 2.0 m high. He uses a lever and with a force of 10.0 N. What is the resistance force
*February 7, 2012*