Thursday

December 18, 2014

December 18, 2014

Total # Posts: 56

**physics**

A car traveling due east at 20 m/s reverses its direction over a period of 10 seconds so that it is now traveling due west at 20 m/s. What is the direction of the car’s average acceleration over this period? a- The car’s average acceleration points due west. b- The ...
*October 22, 2014*

**college physics**

A cruise ship of seniors is moving due west with an engine speed of 60km/hr when it encounters a current from the North at 20Km/hr. What is its relative velocity due to this current? (speed and angle) What course correction does it need to continue due west? (new angle and ...
*October 30, 2012*

**college physics**

A cannonball shot at an angle of 60 Degrees had a range of 196m. What was its initial speed?
*October 30, 2012*

**college physics**

A 3rd baseman is throwing a ball to 1st base which is 39.0m away. It leaves his hand at 38.0m/s at a height of 1.50m from the ground and makes an angle of 20 Degrees. How high will it be when it gets to 1st base.
*October 30, 2012*

**college physics**

A ball is thrown from a 20.0m high building and hits the ground 6.0m from the building. With what horizontal velocity was it thrown?
*October 30, 2012*

**physics college**

A dog sled is pulled at an angle of 30 degrees with the horizon using a tension of 450N. If the sled has a mass of 50kg, then find the recoil, forward force and acceleration (if any).
*October 24, 2012*

**physics college**

A rocket booster fires in space with a force of 500N and moves the 10kg satellite from rest to motion in 2.1 seconds. Find the acceleration? What is the final speed of the satellite?
*October 23, 2012*

**physics college**

A lamp has a mass of 10kg and is supported by two wires that make an angle of 35 degrees between them. Find the tension in each wire?
*October 23, 2012*

**physical**

A dog is pulled at an angle of 30 degrees with the horizon using a tension of 450N. If the sled has a mass of 50kg, then find the recoil, forward force and acceleration (if any)?
*October 23, 2012*

**stat**

Help my name is Gee and i have posted several question on and ive waited for help and no one will answer can someone please assist me. My post were on Sept 13 and 18 2012 thank you
*September 20, 2012*

**statistics**

Can someone please answer my question help
*September 19, 2012*

**statistics**

Healthy breakfast contains the rating of 77 cereals and the number of grams of sugar contained in each serving. A simple linear regression model considering "sugar" as the explanatory variable and "rating" as the response variable produced the following ...
*September 19, 2012*

**statistics**

Can someone please answer my question please
*September 18, 2012*

**statistics**

Pre study scores versus post-study scores for a class of 120 college freshman english students were considerated. The residual plot for the least squares regression line showed no pattern. The least square regression line was y = 0.2 + 0.9x with a correlation coefficient r = 0...
*September 18, 2012*

**statistics**

Can someone please answer my question thank u
*September 18, 2012*

**statistics**

Use the following information to calculate the lower and upper fence: A teacher was interested in how many text messages teenagers got per day. He randomly selected 70 students and asked them how many text messages they received the previous day. The mean (x)=23.1 standard ...
*September 18, 2012*

**statistics**

If a distribution is skewed, should the mean must be smaller than the median?
*September 18, 2012*

**statistics**

Can categorical data be graphed using a boxplot?
*September 18, 2012*

**statistics**

A correlation of 0 always means there is no relationship between x and y true or false?
*September 18, 2012*

**statistics**

Is another name for an explanatory variable an independent variable?
*September 18, 2012*

**statistics**

standard deviation is not resistant to outliers true or false?
*September 18, 2012*

**statistics**

Is weight an example of a discrete variable?
*September 18, 2012*

**statistics**

The box plot below summarize the distributions of SAT verbal and math scores among students at an upstate New York high school. 300 400 500 600 700 800 data Whic of the following statements is false? 1. The range of the math scores equals the range of the verbal scores. 2. The...
*September 18, 2012*

**statistics**

On a given day the NYSE opening price per share for the 100 largest U.S. corporations has a mean of $385 and a median of $92. We can conclude A. The distribution of the price per share is symmetric, B. The distribution of the price per share is skewed to the right or is it ...
*September 13, 2012*

**statistics**

On a given day the NYSE opening price per share for the 100 largest U.S. corporations has a mean of $385 and a median of $92. We can conclude A. The distribution of the price per share is symmetric, B. The distribution of the price per share is skewed to the right or is it ...
*September 13, 2012*

**statistics**

A teacher was interested in how many text messages teenagers got per day. He randomly selected 70 students and asked them how many text messages they reveived the previous day.?
*September 13, 2012*

**statistics**

Pre- study scores versus post- study scores for a class of 120 college freshman english students were considerated. The residual plot for the least squares regression line showed no pattern. The least squares regression line was y^=0.2+0.9x withwith a correlation coefficient r...
*September 13, 2012*

**statistics**

The data set healthy breakfast contains the ratings of 77 cereals and the number of grams of sugar contained in each searving. A simple linear regression model considering Sugar as the explanatory variable and Rating as the response variable produced the following regression ...
*September 13, 2012*

**statistics**

I want to examine the relationship between gas mileage of cars and the engine size ( displacement in cubic inches). The explanatory variable is?
*September 6, 2012*

**statistics**

I want to examine the relationship between gas mileage of cars and the engine size ( displacement in cubic inches). The explanatory variable is?
*September 6, 2012*

**statistics**

The ABC Company has been evaluating the performance of two advertising agencies it deals with. They produce the following scatterplot of sales against advertising expenditures.
*September 6, 2012*

**statistics**

The data in the scatterplot below are an individual' s weight and time it takes ( in seconds) on a tredmill to raise their pulse rate to 140 per minute. The o' s correspond to females and the +'s to males.
*September 6, 2012*

**statistics**

I wish to determine the correlation between the height ( in inches) and weight ( in pounds) of 21 year old males. To do this , i measure the height and weight of two 21 year old men. The measured values are?
*September 6, 2012*

**statistics**

The lifetime of a 2- volt non- rechargeable battery in constant use has a normal distribution with a mean of 516 hours and a standard deviation of 20 hours. What is the z-score for batteries with lifetimes of 600 hours?
*September 6, 2012*

**statistics**

The lifetime of a 2- volt non-rechargeable battery in constant use has a normal distribution of 516 hours and a standard deviation of 20 hours. What is the z- score for batteries with lifetimes of 520 hours?
*September 6, 2012*

**statistics**

Research reports a correlation of +0.8 between math achievement and math aptitude it also reports a correlation of -0.8 between math achievement and a math anxiety. Which interpretations is most c?orrect
*September 5, 2012*

**statistics**

A student computes the correlation between two variables in a spreedsheet and finds r= 0.06.Is there a relationship between the variables?
*September 5, 2012*

**statistics**

If a certain species of female lizard mate males that are .75 years younger what would the correlation between the ages of the males and female lizard be?
*September 5, 2012*

**statistics**

The cholesterol levels of young women aged 20 to 34 vary approximately normal with mean 185 milligrams per deciliter and standard deviation 39 mg/dl. Cholesterol levels for men vary with mean 222mg/dl and standard deviation 37 mg/dl Sandy's cholesterol level is 220 her ...
*September 5, 2012*

**statistics**

The lifetime of a 2 volt non- rechargeable battery has a normal distribution with a mean of 516 hours and a standard deviation of 20 hours.What is the z- score for batteries with lifetimes of 600 hours
*September 3, 2012*

**statistics**

The most common intelligence quotient (IQ) scale is normally distributed with mean 100 and standard deviation 15. What score would put a child 3 standard deviations above the mean
*September 3, 2012*

**statistics**

The cholestetol levels of young women aged 20 to 34 vary with a mean of 185 milligrams per decliter and standard deviation 39 mg/dl. What cholesterol level would be a young woman have in this age group if they were 2 standard deviations below the mean?
*September 3, 2012*

**statistics**

The most common intelligence quotient (IQ) scale is normally distributed with mean 100 and standard deviation 15. What score would put a child 3 standard deviations above the mean
*September 3, 2012*

**statistics**

The lifetime of a 2 volt non-rechargeable battery has a normal distribution with a mean of 516 hours and a standard deviation of 20 hours. What is the z- score for batteries with lifetimes of 520 hours
*September 3, 2012*

**math**

h(x)=2x-5 h(0)= h(-8)=
*October 31, 2011*

**alegbra**

2d+3=13
*October 31, 2011*

**precalc(help!!)**

I have been trying to figure this out for hours and I still cant figure it out! Please help me.. The question says to find the value of theta when sin(theta)=0 the answers include equations like pi/2 +2piK 0=2piK pi/2+pik pik
*August 5, 2011*

**physics**

A large wooden wheel of radius R and the moment of inertia I is mounted on an axle so as to rotate freely. A bullet of mass m and speed v is shot tangential to the wheel and strike its edge, lodging in the wheel’s rim. If the wheel was originally at rest, what is its ...
*December 4, 2010*

**english**

authenticity is the right answer just checking thought>>>
*November 1, 2010*

**Algebra**

A minor league baseball team plas 84 games in a season. If the team won 15 more than twice as many games as they lost, how many wins and losses did the team have?
*September 23, 2010*

**physics**

a car is moving at 40km per hour what is the velocity in meters per second?
*March 7, 2010*

**Economics**

Why does the US need a single banking system to help organize its financial structure?
*May 13, 2009*

**Math**

I need help with this question: Estimate the product by rounding to the nearest one 6.38 times 18.716 I said on my assignment 120 and my teacher marked it wrong. She said it's 114, and I donot see how it's 114. Any input, would certainly be welcome. Thank you! By ...
*March 4, 2007*

**Algebra**

How do I solve this? 2 {2/3 } / 4/5 / 1/3 {4/9} / 4/4 / 1/3 How do I cross multily the numbers? Is the (2/3) supposed to be squared? Is the (4/5)/(1/3) in a denominator below (2/3) ? You need to use more parentheses or brackets to clarify the order of operations. (4/5)/(1/3) ...
*February 19, 2007*

**physics**

there also is a problem with the vaster train's distance. Make sure to divide by two. Dividing in this instance makes the d of the faster train 800 instead of 1600. These different numbers don't change the fact that they collided, though, considering d1+d2=total, which...
*September 18, 2006*

**physics**

(1)v_f^2= v_o^2 + 2ad so d=(v_f^2 - v_o^2)/2a For the red train v_f=0m/s, v_o=20m/s and a=-1m/s^2 then d=(0-400)/-1 m = 400m this statement is wrong-- you failed to multiply the acceleration by 2 as it states in the equation. So (vx^2-vx0^2)/2(ax)= x so therefore--(0-400)/(2*-...
*September 18, 2006*

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