# Posts by Jacob

Total # Posts: 903

**chemistry**

A sample of an unknown gas effuses in 11.5 min. An equal volume of H2 in the same apparatus at the same temperature and pressure effuses in 2.77 min. What is the molar mass of the unknown gas?

**science..physics**

I'm on a test..don't get me wrong physics is hard. Ha. A 10 kg sled is pulled horizontally by a force. If the coefficient of static friction is 0.3 , what force is needed to get the sled moving at a constant velocity?

**Science**

no really were all just in the library helping each other get ready for a bug chem test

**Science**

Constract a heating/cooling curve from an MSDS, draw multistep energy bar charts that correspond to the curve, and calculate the total. Energy released/ absorbed

**NEED HELP POSTED TWICE**

1. Find the slope of the line through the pair of points. (-1/3,0) and (-1/2,-1/2) Choices: -3 1/3 -1/3 3 2. Write in standard form an equation of the line passing through the given point with the given slope. Slope=8/7; (5,-3) Choices: -8/7x+y=-61/7 -8/7x-1=-61/7 -8/7x+y=61/7...

**Algebra 2**

1. Find the slope of the line through the pair of points. (-1/3,0) and (-1/2,-1/2) Choices: -3 1/3 -1/3 3 2. Write in standard form an equation of the line passing through the given point with the given slope. Slope=8/7; (5,-3) Choices: -8/7x+y=-61/7 -8/7x-1=-61/7 -8/7x+y=61/7...

**PHYSICS**

Jade you got to remember that it is accelerating downwards since gravity is -9.8 m/s. so it is not easy as that and I would think before you try and put your knowledge on the page.

**math**

Can someone explain to me how this question has the answer like this Points:(2,3) y=-2f[2(x+5)] - 4 The answers are (2, 3) ( 2, -3) -> (2, -6)-> (1, -6) -> (-4, -10) I know it has to do with translations like 1/k etc.. but im a bit confused ):

**3rd grade math (array)**

how i do (6)(4)

**algebra**

What is the answer to 7(d+5d) - 16d

**6th grade**

use the distbutive property to rewrite the expression as a product. 6+18y+24

**Physics**

Convert the meters cubed to liters. Divide 8.7604x10^6 by how many liters the tanker truck can hold. Easy peasy :)

**physics**

An airplane is flying with a speed of 240 km/hr at an angle of 27 degrees north of east. a) How fast is the plane flying north? b) How fast is the plane flying east?

**math**

6*6+6*6-6=24 Where would the parenthesis go?

**Chemistry**

Why does molarity depend on temperature?

**9th grade**

Around the time of the roman empire the terms inch, foot, and yard were refine. what was the length of a foot based on?

**algebra**

2y^-3 = 4e^(-x/2)/(1+e(-x/2)) my teacher gave this problem in my chem class and i don't know what he is really asking , does any one have an idea if i have to solve for y or what's going on..

**CALCULUS**

Use the product rule to calculate the derivative. dh dx x = 4 , h (x) = (x^(-1/2) + 7x)(9 - x^-1) very weird.. i know how to do it, i used product rule and got an answer in decimal but the website is not accepting it. Can any one help me?...

**chemistry**

how would one do this problem.. 2y^-3 = 4e^(-x/2)/(1+e(-x/2))

**Math**

What is 87 to the power of 8?

**physics**

if you are an observer moving at 3.2 m/s towards an object that is moving toward you at 1.4 m/s, what is the relative velocity of the object moving toward you?

**Physics**

The drawing shows an elastic cord attatched to two back teeth and stretched across a front tooth. The purpose of the arrangement is to apply a force to the front tooth. If the tension in the cord is 1.2N what are the magnitude and direction of the force applied to the front ...

**Math**

Yes, thank you. I was doing it that way, but didn't know if I was correct.

**Math**

Find: Re[1/(2+j)] Im[2+j/(3+4j)]

**History**

Yes or no. To have a favorable balance of trade, a country must sell fewer goods to other countries than it buys from other countries. Yes or no.Money is an example of an capital resource. Yes or no.In our economic system, people receive wages for producing goods or providing ...

**college math**

stratified sampling

**English**

I agree with SraJMcGin, that will give you the answers.

**Algebra 1**

Thank you Jen. U r great

**Algebra 1**

pythagorean theorema=13 b=9 c=?

**ARTICLES OF CONFED. - HISTORY**

How did the Confederation Congress attempt to colve the problem of staus of western territory that the states had ceded to it? Which interest groups favored which plans for the sale and distribution of land?

**Algebra**

Kate cut a 100-foot rope into two pieces. One piece was 5 feet longer than 4 times the length of the other. Find the length of each piece.

**math**

The height of a rocket in meters t seconds after it is launched is approximated by the polynomial 0.5 at2 + vt + y where a is always -9.8, v is the initial velocity, and h is the initial height. The 4400i was launched from the ground at the same time the Q99 was launched from ...

**math**

The height of a rocket in meters t seconds after it is launched is approximated by the polynomial 0.5 at2 + vt + y where a is always -9.8, v is the initial velocity, and h is the initial height. A 300X was launched from a height of 10 meters. What was its height after 3 seconds?

**english**

in the diary of anne frank. how does anne use imagery to describe both the environment of her hiding place and the people in it.

**English**

How does Anne use imagery to describe both the environment of her hiding place and the people in it?

**Math**

how do you find the fractional notation for the ratio of 54.28 to 89.69

**Geometry**

It should be D. If the hypotenuse and leg of a right triangle are congruent to the hypotenuse and leg of another right triangle, then the triangles are congruent

**math**

A 16-ft ladder is sliding down a wall as shown in the figures below. The variable h is the height of the ladder's top at time t, and x is the distance from the wall to the ladder's bottom. Suppose that the top is sliding down the wall at a rate 5 ft/s. Calculate dx/dt ...

**Statistics**

Assume that about 45% of all U.S. adults try to pad their insurance claims. Suppose that you are the director of an insurance adjustment office. Your office has just received 110 insurance claims to be processed in the next few days. What is the probability that fewer than 45 ...

**Statistics**

Assume that about 45% of all U.S. adults try to pad their insurance claims. Suppose that you are the director of an insurance adjustment office. Your office has just received 110 insurance claims to be processed in the next few days. What is the probability that fewer than 45 ...

**Statistics**

Assume that about 45% of all U.S. adults try to pad their insurance claims. Suppose that you are the director of an insurance adjustment office. Your office has just received 110 insurance claims to be processed in the next few days. What is the probability that fewer than 45 ...

**Statistics**

. Suppose that about 20% of those called will find an excuse (work, poor health, travel out of town, etc.) to avoid jury duty. If 14 people are called for jury duty, what is the probability that all 14 will be available to serve on the jury? Round your answer to three decimal ...

**Statistics**

. As the sample size increases The confidence interval also increases (gets larger) The confidence interval decreases (gets smaller) The confidence interval stays the same The population mean increases.

**Statistics**

What is meant by the 95% confidence interval of the mean ? That 95% of my sample is OK to do more tests. That I am 95% confident that the confidence interval will contain the parameter being estimated. That 5% of my sample is not OK. That I am 95% sure that the population mean...

**Statistics**

Suppose in a carnival game, there are six identical boxes, one of which contains a prize. A contestant wins the prize by selecting the box containing it. Before each game, the old prize is removed and another prize is placed at random in one of the six boxes. Is it appropriate...

**Statistics**

Suppose in a carnival game, there are six identical boxes, one of which contains a prize. A contestant wins the prize by selecting the box containing it. Before each game, the old prize is removed and another prize is placed at random in one of the six boxes. Is it appropriate...

**Statistics**

Suppose that x has a distribution with = 10 and = 5. If a random sample is taken of size n = 44, find . 10.00 my answer was 0.75 is this correct 0.75 1.51 0.11 5.00

**Statistics**

. A certain company makes 12-volt car batteries. After many years of product testing, the company knows that the average life of a battery is normally distributed, with a mean of 45 months and a standard deviation of 7 months. If the company does not want to make refunds for ...

**Statistics**

Suppose I am using the t-distribution to estimate or test the mean of a sample from a single population. If the sample size is 25, then the degrees of freedom are ____? I have an answer of 26 is this correct

**Statistics**

Suppose in a carnival game, there are six identical boxes, one of which contains a prize. A contestant wins the prize by selecting the box containing it. Before each game, the old prize is removed and another prize is placed at random in one of the six boxes. Is it appropriate...

**Statistics**

I am having trouble understanding standard normal distribution such as if p(z<-0.13) the answer to that was 0.4483 but not understanding how that is computed.

**Statistics**

Suppose a certain species bird has an average weight ofx=3.55 grams. Based on previous studies, we can assume that the weights of these birds have a normal distribution with 0=0.37 grams. For a small group of 15 birds, find the margin of error for a 70% confidence interval for...

**Statistics**

In a random sample of 508 judges, it was found that 281 were introverts. Let p represent the proportion of all judges who are introverts. Find a point estimate for p. Round your answer to four decimal places. I am needing assitance in trying to figure out the correct formula ...

**Statistics**

I am having trouble understanding standard normal distribution such as if p(z<-0.13) the answer to that was 0.4483 but not understanding how that is computed.

**Statistics**

Can a frequency distribution have overlapping classes? Sometimes No Yes Can't determine. I need more information my answer is sometimes, but i believe this to be incorrect

**Statistics**

Which of the following can be classified as Discrete and Quantitative data. The acceleration of your car as you drive to school. my answer was number of neighbors still unsure of this though The different colors of the eyes of your classmates. The number of students in your ...

**Statistics**

Which of the following can be classified as Discrete and Quantitative data. The acceleration of your car as you drive to school. my answer was number of neighbors still unsure of this though The different colors of the eyes of your classmates. The number of students in your ...

**Statistics**

Can a frequency distribution have overlapping classes? Sometimes No Yes Can't determine. I need more information

**Statistics**

I am having trouble understanding standard normal distribution such as if p(z<-0.13) the answer to that was 0.4483 but not understanding how that is computed.

**Statistics**

Can a frequency distribution have overlapping classes? Sometimes No Yes Can't determine. I need more information

**Statistics**

Which of the following can be classified as Discrete and Quantitative data. The acceleration of your car as you drive to school. my answer was number of neighbors still unsure of this though The different colors of the eyes of your classmates. The number of students in your ...

**Statistics**

Suppose in a carnival game, there are six identical boxes, one of which contains a prize. A contestant wins the prize by selecting the box containing it. Before each game, the old prize is removed and another prize is placed at random in one of the six boxes. Is it appropriate...

**Statistics**

Richard has been given a 5-question multiple-choice quiz in his history class. Each question has four answers, of which only one is correct. Since Richard has not attended the class recently, he does not know any of the answers. The success occurs if Richard answers a question...

**Statistics**

How many sequences contain exactly three heads when you flip a coin five times? 2 15 10 8 12 my answer was 15 ,but that was incorrect

**Statistics**

still questionable not understanding how to get the problem with the correct answer

**Statistics**

You draw two cards from a standard deck of 52 cards and replace the first one before drawing the second. Find the probability of drawing a 4 for the first card and a 9 for the second card. Round your answer to the nearest thousandth. 0.006 0.039 0.019 0.155 0.026 which wwould ...

**Statistics**

A football team’s coach predicts that his team will win 9 out of 10, or 90%, of its games. Which method did he most likely use to make this prediction my answer to this is relative frequency is this correct equally likely outcomes intuition law of large numbers ...

**Statistics**

httth

**Statistics**

A football team’s coach predicts that his team will win 9 out of 10, or 90%, of its games. Which method did he most likely use to make this prediction my answer to this is relative frequency is this correct

**Statistics**

how to sketch the areas under the standard normal curveover the indicated intervals and find the specified areas to the left z=0 to the left z=-0.47 to the left of z=0.45

**Statistics**

fawnsbetween one and five months old have a approx body weight of u=27.2 kilograms and a standard deviation of o= 4.3 kilograms let x be the the weight of the fawn in kilograms convert the following x intervals to z intervals. x=<30 19<x 32<z<35

**Statistics**

What are the values of the mean and standard deviation of a normal standard deviation

**Statistics**

does a raw score less than the mean correspond to a positive or negative score? what about a raw score greater than the mean.

**language arts**

There is this paper that my teacher gave me and its sooooooo confusing.The directions say:change the word at the bottom of each ladder to the word at the top.Change one letter at a time.Rules:1.If the letter is to the right of the step,remove the word and put another letter in...

**music**

i cant figure out what a quarter note,scale,tie,treble clef,fermata,accent,half note,sharp, and a stem look like

**health**

im learning about skin @ hair but im stuck on questions about the dermis

**algebra 1**

v^2-7v-30/v^2-5v-24

**math**

what is the rule for Table 1?what are the missing output entries in Table?

**Math**

What is the area and perimeter of a quadrilateral that has a width of 4m and length of 14m

**calculus**

A uniform thin sheet of metal is cut in the shape of a semicircle of radius R and lies in the xy plane with its center at the origin and diameter lying along the x axis. Find the position of the Center of Mass using polar coordinates.

**Physics**

ok formula L=Iw i know I=5kgm^2 and i am finding w. How would i go about finding L give me a hint.

**Physics**

Wong is standing on a turntable in class holding a weight in each hand a distance .75 meters from the center of his body. He is originally rotating with an angular frequency w=0.3 rad/s. He pulls the weights in so they are only .25 meters from the axis of rotation. The ...

**physics**

A box is pulled across a horizontal surface at a constant speed by a horizontal rope with tension T=30N. The coefficient of friction between the box and surface is uk = 0.05. 1. Calculate the work done by friction as the box moves 4 meters to the right. i thought it would be ....

**physics**

momentum is p=mv so p(brother)=(35.6)(9.50)and p(skateboard)= (1.3)(9.50) solve and add them.

**Physics**

A student gets a 2.9 kg mass to oscillate up and down on bottom of a light vertical spring by pulling her hand up and down on the top end of the spring. The spring is a real spring with a spring constant of 93 N/m and a damping constant of 0.7 N sec/m. (b) The student now ...

**Physics**

Two geekie physics students with a combined mass of 131 kg jump into their old car to run out for some late night pizza. The distance between the front and back axles of the car is 2.9 m. When they get in the car, the springs compress a total of 9.3 cm. On their way to the ...

**trigonometry**

It would be 2pi/6 because period (1 oscillation) = 2pi/b

**Physics**

A student gets a 2.9 kg mass to oscillate up and down on bottom of a light vertical spring by pulling her hand up and down on the top end of the spring. The spring is a real spring with a spring constant of 93 N/m and a damping constant of 0.7 N sec/m. (a) At what approximate ...

**Physics**

Two geekie physics students with a combined mass of 131 kg jump into their old car to run out for some late night pizza. The distance between the front and back axles of the car is 2.9 m. When they get in the car, the springs compress a total of 9.3 cm. On their way to the ...

**physics**

A student throws a 9 gram of gum is thrown across the physics lab from a distance of 2.5 m. When the gum has a horizontal velocity of vo it connects with a mass on the end of 1.62 kg simple pendulum which is initially at rest. The pendulum has a length of L of 0.74 m. The gum ...

**Physics**

nvm i got it, thanks for the help guys.

**Physics**

can you write me some kind of a equation or explain to me in a way which i can understand. because what they wrote is just flying over my head and i have already spent a good amount of time trying to figure these out. so please help

**Physics**

A physics student of mass mm = 100 kg gets a summer job painting houses. On his first project, he builds a platform using large pine board with a mass of mb = 60 kg The board has an overall length of L = 8.5 meters and set on two 1 meter tall saw horses so that l = 2.25 ...

**Biology---Urgent!**

if you are using APA, then its the (author, p. 4-9) I believe.

**Chemistry New question**

If 12.5 mL of 8.6 multiplied by 10-2 M NaOH is added to 32.5 mL of 6.0 multiplied by 10-4 M NaOH, what is the pH of the solution?

**Chemistry: Acid Base Equilbria**

pH = .5 (pka1)

**Chemistry**

A 1.50 M solution containing 25 Grams of Al(OH)3 would occupy what volume in liters?

**map**

How do you draw a net duagram for a group of cubes???!!!

**frictonsplease**

please help with frictions thanks

**5th grade**

What events led up to the Civil War? A State's Rights B Slavery C All of the above