Wednesday

January 18, 2017
Total # Posts: 53

**physics**

Explain why helicopters need 2 rotors to fly in a straight line. Talking about centripetal force.

*December 14, 2016*

**physics**

Explain why helicopters need 2 rotors to fly in a straight line.

*December 14, 2016*

**Physics**

A bowling ball pendulum demonstration goes bad. The 8.0-lb bowling ball is raised to the height of the demonstrators nose, 160 cm above the ground, and releases the bowling ball. When the bowling ball is at the lowest point of the swing (36 inches above the ground), the knot ...

*November 13, 2016*

**math algebra?**

If I spend 2/3 on a car then 2/3 on a boat and have£2000 left what did I start with

*June 2, 2014*

**quantum physics**

its wrong.8 d,

*October 18, 2013*

**quantum physics**

r u right,david abt 8d?and wat abt 8 b?

*October 18, 2013*

**quantum physics**

r u right,david abt 8d?

*October 18, 2013*

**physics**

sure last option?justify

*April 19, 2013*

**Math**

Teresa has 4 flower pots in 4 different designs she likes to display her flower pots in different position on her window sill how many ways can she place her flower pots?

*November 6, 2012*

**Math**

If a car is going 50 mph and is hit by a car going 70 mph, how fast (what mph) does the car going 50 mph hit the wall

*November 5, 2012*

**math**

5 3/5 + 3/4 + 2 1/2 =

*April 30, 2012*

**Math**

I want to creat a easy-to-use formula to measure the intensity of a exercise workout. The input factors are: 1. Minutes exercise. 2. Miles run. 3. Calories burned. 4. Level of treadmill. So, if: Minutes = 50 Miles = 4 Calories = 423 Level = 10 Therefore, what is the overall ...

*April 21, 2012*

**physics**

It is the derivative if you know calculus.

*October 17, 2011*

**Math**

12 - 9 = 15d + 9? please help with operations

*March 1, 2011*

**Math**

12 - 9 = 15d + 9? please help with operations

*March 1, 2011*

**Math**

Please I need help with operations to this following problem: 12d - 9 = 15d + 9

*March 1, 2011*

**8th grade science**

Velocity is displacement divided by time, its a vector having both magnitude and direction Speed is distance divided by time and is scalar having a magnitude only. ie. a man runs a race stopping at the finish line, hence 0 displacement and no velocity. He would have speed ...

*February 28, 2011*

**chemistry**

When you consume a lot of food that is basic, how does your stomach respond to it? Why is this response necessary? Do you want to neutralize ALL the acid in your stomach? Why or Why not (Hint: What is the stomach acid for?) Describe and explain two possible advantages of ...

*March 31, 2010*

**Science**

These are 3 of the 21 questions i have and they seem pretty difficult. Someone help me please :). When you consume a lot of food that is basic, how does your stomach respond to it? Why is this response necessary? Do you want to neutralize ALL the acid in your stomach? Why or ...

*March 31, 2010*

**chemistry**

How many moles of calcium carbonate can be disloved in .0250 moles of hydrocloric acis

*March 16, 2010*

**algebra topics**

- 7/8 - 4/5 simplify

*February 15, 2010*

**Business Statistics**

) A sample of eight observations of variables x and y is shown below: x 5 3 7 9 2 4 6 8 y 20 23 15 11 27 21 17 14 Find the value of coefficient of correlation, r. a) - 0.991 b) 0.872 c) - 0.512 d) 0.942 2) In the past, young women drivers have maintained a better driving ...

*March 29, 2009*

**Statistics**

A monthly report to the Texas Department of Health, division of Water Hygiene, contained the following water production data in thousands of gallons: 5263 5636 5264 4395 6090 5293 4668 5725 5171 4378 5118 5538 4838 5167 5119 5438 6843 5262 4653 5303 5913 4570 5142 5964 6431 ...

*March 29, 2009*

**Statistics**

Intentions of consumers regarding future automobile purchases and the financial capability of the consumers are given below: What is the provability of P(A | D)? a)0.5 b)0.75 c)1 d)0

*March 29, 2009*

**Statistics Help**

Six candidates for a new position of vice-president for academic affairs have been selected. Three of the candidates are female. The candidates’ years of experience are as follows. Candidate Experience Female 1 Female 2 Female 3 Male 1 Male 2 Male 3 5 9 11 6 4 8 Suppose ...

*March 29, 2009*

**Statistics- I think I have the answer**

The salaries (in thousands of dollars) for a sample of 13 employees of a firm are: 26.5, 23.5, 29.7, 24.8, 21.1, 24.3, 20.4, 22.7, 27.2, 23.7, 24.1, 24.8, and 28.2. Compute the variance of the salaries. a)2.562 b)6.125 - I Picked this c)9.223 d)7.097

*March 29, 2009*

**Statistics Help**

A medical statistician wanted to examine the relationship between the amount of sunshine (x) and incidence of skin cancer (y). As an experiment, he found the number of skin cancers detected per 100,000 of population and the average daily sunshine in eight counties around the ...

*March 29, 2009*

**Statistics Help Please**

A sample of eight observations of variables x and y is shown below: x 5 3 7 9 2 4 6 8 y 20 23 15 11 27 21 17 14 Find the value of coefficient of correlation, r. a) - 0.991 b)0.872 c)- 0.512 d)0.942

*March 29, 2009*

**Statistics**

Much of the emphasis in TQM is an understanding and reducing variation within the process through which the product is produced, and samples of output are used in reaching inferences about the stability of the process. I choose True. True False

*March 22, 2009*

**Statistics**

Much of the emphasis in TQM is an understanding and reducing variation within the process through which the product is produced, and samples of output are used in reaching inferences about the stability of the process. I choose True. True False

*March 22, 2009*

**Statistics**

When no point lies outside the control limits of a chart, we conclude that: A) variation in the process is caused by assignable causes and there is enough evidence to infer that the process is in statistical control. B) variation in the process is caused by chance and there is...

*March 22, 2009*

**Statistics**

If a point is more than 3 sigmas away from the centerline, or if two out of three consecutive points are on the same side of the centerline and more than 2 sigmas away from it, the process is deemed to be in control. True False

*March 22, 2009*

**Statisitics**

When the purpose of sampling is to detect when a process becomes too variable, the chart of choice will be an R chart. I picked true on this? True False

*March 22, 2009*

**Statistics**

When the purpose of sampling is to detect when a process becomes too variable, the chart of choice will be an R chart. True False I picked True.

*March 22, 2009*

**Statistics**

A multiple regression model has the form: As x2 increases by 1 unit, holding constant x1, then the value of y will increase by: ^ is over y = 5.25 + 2.5x1 + 4x^2 A) 2.5 units B) 7.75 unit C) 4 units on average D) 11.75 units on average

*March 22, 2009*

**Business Statistics**

A chi-square test for independence with 8 degrees of freedom results in a test statistic of 18.21. Using the chi-square table, the most accurate statement that can be made about the p-value for this test is that: A) p-value < 0.01 B) 0.025 > p-value > 0.01 C) 0.05 >...

*March 15, 2009*

**Business Statistics**

In a goodness-of-fit test, the null hypothesis states that the data came from a normally distributed population. The researcher estimated the population mean and population standard deviation from a sample of 500 observations. In addition, the researcher used 6 standardized ...

*March 15, 2009*

**Business Statistics**

Given the least squares regression line = -2.88 + 1.77x, and a coefficient of determination of 0.81, the coefficient of correlation is: A) -0.88 B) +0.88 C) +0.90 D) –0.90 I picked C +0.90

*March 15, 2009*

**Business Statistics**

Thanks again MathGuru

*March 15, 2009*

**Business Statistics**

If the total variation in y values is 200, and the variation explained by regression line is 180, then the coefficient of determination is equal to __________. A) 1.11 B) 0.90 C) 0.81 D) 1.21 I picked D 1.21

*March 15, 2009*

**Statistics**

Thank you MathGuru

*March 15, 2009*

**Statistics**

A test for independence is applied to a contingency table with 3 rows and 5 columns for two nominal variables. The degrees of freedom for this test will be: A) 20 B) 12 C) 8 D) 15

*March 15, 2009*

**Statistics**

Need help with these questions: I have already answered 27 out of the 30 accept these last three: 8. Given the significance level 0.01, the F-value for the degrees of freedom, d.f. = (7,3) is. A) 8.45 B) 27.67 C) 5.89 D) 14.62 9. One-way ANOVA is performed on three independent...

*March 8, 2009*

**Statistics**

1) For each of the following statements, formulate appropriate null and alternative hypotheses. Indicate whether the appropriate test will be one-tailed or two-tailed,then sketch a diagram that shows the approximate location of the rejection regions for the test. a) The ...

*March 1, 2009*

**Statistics**

In 2020, the average charge of tax preparation was $95. Assuming a normal distribution and a standard deviation of $10, use the approximate areas beneath the normal curve, as discussed in this section, to answer the following questions. What proportion of tax preparation fees ...

*February 22, 2009*

**Statistics**

Assume x is normally distributed with mean µ= 15 and standard deviation α= 3-. Use the approximate areas beneath the normal curve, as discussed in this section, to answer the following questions. Find P (X ≥15)- A) 0.50 B) 0.16 C) 0.34 D) 0.84

*February 22, 2009*

**Statistics**

1) Laura McCarthy, the owner of Riverside Bakery, has been approached by insurance underwriters trying to convince her to purchase flood insurance. According to local meterologist, there is a 0.01 probability that the river will flood next year. Riverside's profits for the...

*February 16, 2009*

**Statistics**

Using the information presented calculate the following probabilities: Blood Alcohol Level of Victim A B C Age 0.00% 0.01-0.09% 0.10% D 0-19 142 7 6 155 E 20-39 47 8 41 96 F 40-59 29 8 77 114 G 60 over 47 7 35 89 Total 265 30 159 454 A) P(A or D) B) P(B or F) C) P(C or G) D) P...

*February 15, 2009*

**Statistics**

Using the below information calculate the conditional probability of C given each of the age groups, or P(C/D), P (C/E), etc. Compare these probabilities and speculate as to which age groups seem more likely than others to have been (according to the legal definition at that ...

*February 15, 2009*

**statistics**

The following contingency table of frequencies is based on a five year study of fire fatalities in Maryland. For purposes of clarity, columns and rows are identified by the letters A-C and D-G respectively. Blood Alcohol Level of Victim Age A B C 0.00% 0.01-0.09% ¡&...

*February 15, 2009*

**maths**

multiply and simplify 2(b + 3) + 3(2b - 1)

*November 30, 2008*

**Engineering**

I need help solving the following simultaneous equations, for the values of Vo and a: 1.4 = Vo e^-32a 4 = Vo e^-6a I've never come across simultaneous equations like this (e is the base of natural logarithms, so perhaps taking logs of both sides might help, but I'm ...

*May 13, 2007*

**Genral Science**

What C word defines a substance that speeds a chemical reaction without being consumed? http://en.wikipedia.org/wiki/Catalysis

*March 28, 2007*

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