Friday

April 25, 2014

April 25, 2014

Total # Posts: 1,185

**Physics**

Hot air balloons float in the air because of the difference in density between cold and hot air. In this problem, you will estimate the minimum temperature the gas inside the balloon needs to be, for it to take off. To do this, use the following variables and make these assump...

**statistics**

If someone scored two Standard Deviations above the Mean on a standardized test where the Mean = 100 and the Standard Deviation = 15, then that person’s numerical score would be…?

**math**

is it 1

**math**

which of the following expressions shows the equation to use in finding the dimensions of cube n by n by n by n with a volume of 125? 1. n to the third power =125 2. n to the second power= 125 3. 3n=125 4.n=125/3

**math**

oh your right okay so then its 135

**Physics**

A 50-story building is being planned. It is to be 200.0 high with a base 48.0 by 66.0 . Its total mass will be about 2.5×107 , and its weight therefore about 2.5×108 . Suppose a 200 wind exerts a force of 860 over the 66.0 wide face . Part A Calculate the magnitude...

**Geometry**

John places a mirror on the ground between himself and an apartment building. He then stands so that he can see the top edge of the building in the center of the mirror. The center of the mirror is 6.10 meters from her feet and 18.30 meters from the building. John’s eyes ...

**bus stats**

Given the following information about a hypothesis test of the difference between two means based on independent random samples, what is the standard deviation of the difference between the two means? Assume that the samples are obtained from normally distributed populations h...

**business stats**

Given the following information about a hypothesis test of the difference between two means based on independent random samples, which one of the following is the correct rejection region at a significance level of .05? Assume that the samples are obtained from normally distri...

**mba stats class, help!!**

true or false. In an experiment involving matched pairs, a sample of 14 pairs of observations is collected. The degree of freedom for the t statistic is 12

**Chemistry**

Whoops forgot that part of the question: A closed flask originally contains 1.7 mol/L SO2 and O2.

**Chemistry**

The oxidation of sulfur dioxide to sulfur trioxide is an important reaction. At 1000K, the value of Kc is 3.6 x 10^-3. What is [SO3] at equilibrium when the reaction vessel is maintained at 1000K.

**mba stats class, help!!**

a door to door sales person for a household appliance has learned from her past experience that out of 10 demonstrations of her appliaance only 4 result in actual sales. This week she needs to make at least 5 sales. At least how many demonstrations does she need to perform to ...

**nba stats help!!**

The weight of a product is normally distributed with a standard deviation of .8 ounces. What should the average weight be if the production manager wants no more than 1% of the products to weigh more than 7.3 ounces?

**mba stats class, help!!**

A salesperson goes door-to-door in a residential area to demonstrate the use of a new Household appliance to potential customers. She has found from her years of experience that after demonstration, the probability of purchase (long run average) is 0.30. To perform satisfactor...

**stats **

A salesperson goes door-to-door in a residential area to demonstrate the use of a new Household appliance to potential customers. She has found from her years of experience that after demonstration, the probability of purchase (long run average) is 0.30. To perform satisfactor...

**stats**

The weight of a product is normally distributed with a standard deviation of .8 ounces. What should the average weight be if the production manager wants no more than 1% of the products to weigh more than 7.3 ounces?

**stats**

a door to door sales person for a household appliance has learned from her past experience that out of 10 demonstrations of her appliaance only 4 result in actual sales. This week she needs to make at least 5 sales. At least how many demonstrations does she need to perform to ...

**stats**

a door to door sales person for a household appliance has learned from her past experience that out of 10 demonstrations of her appliaance only 4 result in actual sales. This week she needs to make at least 5 sales. At least how many demonstrations does she need to perform to ...

**stats**

a door to door sales person for a household appliance has learned from her past experience that out of 10 demonstrations of her appliaance only 4 result in actual sales. This week she needs to make at least 5 sales. At least how many demonstrations does she need to perform to ...

**Chemistryy.**

Some mole problems! Which quantity of neon may be represented by the symbol Ne? A) 1 gram B) 4 liters C) 6 x 1023 atoms D) 2 moles A sample of nitrogen containing 1.5 x 1023 molecules has the same number of molecules as a sample containing A) 1.0 mole of H2 B) 0.25 mole of O2 ...

**physics**

the 2lb box slides on the smooth curved ramp. if the box has a velocity of 30ft/s at A, determine the velocity of the box and the normal force acting on the ramp when the box is located at B and C. assume the radius of curvature of the path is still 5 ft.

**physics**

the 2lb box slides on the smooth curved ramp. if the box has a velocity of 30ft/s at A, determine the velocity of the box and the normal force acting on the ramp when the box is located at B and C. assume the radius of curvature of the path is still 5 ft.

**physics **

the 3 lb block A rests on a surface for which the coefficient of kinetic is Mk=.30 determine the distance the 8-lb cylinder B must descend so that A has a speed of Va = 5ft/s starting from rest.

**physics**

a toy spring gun is used to shoot 28-g bullets vertically upward. the un deformed length is 150 mm, it is compressed to a length of 25 mm when the gun is ready to be shoot and expands to a length of 75mm as the bullet leaves the gun. a force of 45 N is required to maintain the...

**physics**

Does the resonance position change as the length of the tube changes, for example a longer tube?

**pre- algebra**

Tell weather a triangle with side lengths of 10,24,26 could be 45 45 90 degrees or 30 60 90 degrees. Explain.

**maths (mensuration)**

The area of an equilatoral triangle ABC is 50cm^2 . Find AB.

**maths**

Q1) Find area of the triangle ABC where AB=c, AC=b and BC=a. When a=b=c=12m

**Algebra**

How much 20% and 40% copper alloy should be mixed to yield 500 kilograms of 25% copper alloy

**Business**

How will demand and supply trends in the high-definition industry affect the price for HDNet’s programming?

**comm**

Read the summary paragraph on the bottom of p. 37. Identify the author’s goal in writing the paragraph. How effectively do you think the author met that goal? The paragraph is below. Hockenbury and Hockenbury tell us that daily hassles often cause more stress than major p...

**Math**

-4^2+(2)(-4)= 16+-8= 8

**Biology**

A population of animals has a dominant allele for dark-colored fur and a recessive allele for light-colored fur. If the population of animals is 100 and 12 members of the population have the light-colored fur, about what percentage of the population is heterozygous? What perce...

**math**

Wht do u get if a bunch of bad guys fall in the ocean

**spanish**

Make the following word agree in spanish: Un ,abuelos ,amables and traslate them

**Chemistry**

At 35 degrees Celcius, K = 1.6x10^-5 for the reaction: 2NOCl<--> 2NO + Cl2 If 2.0mol NOCl and 1.0mol Cl2 are placed into a 1.0-L flask, calculate the equilibrium concentrations of all species. Answer: [NOCl] = 2.0M [NO] = 8.0x10^-3 [Cl2] = 1.0M --------- What I did: ___2...

**Chemistry**

Great, my answer was correct. But, why did you divide the moles of limiting reactant by 4?

**Chemistry**

Suppose that 0.650 mol of methane, CH4(g), is reacted with 0.800 mol of fluorine, F2(g), forming CF4(g) and HF(g) as sole products. Assuming that the reaction occurs at constant pressure, how much heat is released? Substance & Enthalpy of Form. (kJ/mol) C(g) 718.4 CF4(g) -679....

**english**

how does the first ten mins of the film remember the titans capture the audiences attention?

**APUSH**

I need help understanding this FRQ prompt: Analyze the circumstances around the decision to ultimately relocate persons of Japanese ancestry. The "analyze the circumstances" part really confuses me! Thank you!

**Tx History**

The Mexican War What are the unites states 4 reasons for war? I know one of the reasons is that Mexico refused to pay the united states citizens for damage claims from the Texas revolution.

**Chem**

What is the percent by mass of a solution if 45 grams of acetic acid is added to 90 g of H2O? Thanks.

**Math**

7/11 as a percent

**algebra**

how do i work this problem step by step 12.5=.8x

**science**

what material reflects the least amount of sunlight ?

** chemistry**

How many atoms are contained in 8.8 g of CO2?

**Math**

Okay, thanks! :)

**Math**

The circular rug is placed on a square floor. The rug touches all four walls. How much of the floor space is not covered by the rug? The square floor is 14 feet for length and width.

**Chemistry**

Can Fe2+ and Mn2+ be separated by precipitating FeS(s) and not MnS(s)? Assume [Fe2+]=[Mn2+]=[H2S]=0.10 M. Choose a [H3O+] that ensures maximum precipitation of FeS(s) but not MnS(s). Will the separation be complete? For FeS, Kspa = 6x10^2 ; for MnS, Kspa = 3x10^7

**Geometry - Math**

A picture measures 20 cm x 25 cm. The width of the matting and frame at the top and bottom is 5cm. What should be the dimensions of the frame so that the framed picture is similar to the picture alone

**History**

Yes, there are many world and phrases that I have never heard of.

**History**

How did India experience that arrival of the British, in light of the past? How did India experience the British domination? How did India emerged out of British domination in the 20th century as an independent nation?

**Chemistry**

A water sample saturated in CaF2 has Ca2+ of 115 ppm (115g Ca2+ per 10^6g water sample). What is the F- ion content of the water in ppm?

**History**

When the British arrived to India

**History**

How did India experience that arrival of the west, in light of the past? How did India experience the western domination? How did India emerged out of western domination in the 20th century as an independent nation?

**chemistry**

What do you expect when you mix 1M Na2SO4 with 1M CaCl2?

**Chemistry**

Thank you so much!

**Chemistry**

And it's 0.20M

**Chemistry**

Adding 20mL sodium acetate, sorry.

**Chemistry**

How do I find the volume of 6M stock solution of acetic acid needed to make a 250 mL buffer at a pH 4.7? pka is 4.74

**Business Communications**

A. Good communicators advance more quickly in the company. B. It is true that good communicators advance more rapidly in the company. C. There is evidence that has shown that good communicators advance more rapidly in the company. D. It is the case that good communicators adva...

**Business Communications**

A job application letter is effective in convincing the reader that an applicant is knowledgeable of the company by?

**Business Communitions**

"Investors And their wives" is considered sexist because?

**geometry**

a cube is placed inside a right circular cylinder. How may cubic feet of water will file the cylinder that has the cube in it? The sides of the cube are 24. The radius of the cylinder in 12 square root of 2 thanks you

**Chemistry-Practical Applications**

What are some practical applications of London dispersion forces? And the rule like dissolves like besides making antichap lipstick? Thank you!

**biochem**

If I am given a solid chemical form of both the acid and the base, how do I determine how many grams of each I need to make 1L of a 25mM Tris-HCl buffer with acid concentration of 18.94mM, and base concentration of 6.06mM?

**English**

hey Ms. Sue can you come back and help me? -thanks

**English**

cars Mcdonalds

**English**

I need to think of a question to write about for my inquiry paper and I need a question so I can answer but I can't think of it. It has to be about advertising and need to connect with communication.

**Chemistry**

If a reaction quotient is undefined, and the Kc = 1. A+B=>C A=0m, B=0m, C=10m What happens to the concentrations of A,B,C? do they decrease or increase or no change to reach equil?

**Chemistry**

well if it is undefined, which way would the equilibrium shift?

**Chemistry**

Kc=1. The initial concentrations are A = 0M, B = 0M, C=10M. A+B --> C calculate the reaction quotient. (c)/(a)(b) = 10/0 .. is the answer zero?

**Math**

-36x^2-300=0 solve for x

**Physics**

If you are pushing a box with 100 N of force and the maximum friction is 150 N. What is the net force of the box?

**earth**

classify each of the folowing layers as liquid,rigid,or solid but able to flow slowly:lithosphere,asthenosphere,lower mantle,outer core,inner core.

**Chemistry**

In blueprinting, there are to reactions that occur. The first one: Fe^3+ + C204^-2 (oxalate) -> Fe^2+ + CO3 must occur with light. Can the second reaction described by the chemical equation below occur without light? Fe^2+ + Fe (CN)6^-2 -> Fe3[Fe(CN)6]2 Please explain wh...

**Chemistry - Oxidation, Reduction Reactions**

Fe^3+ + C204^-2 (oxalate) -> Fe^2+ + CO3 Which is the oxidizing agent and the reducing agent in the chemical equation above?

**comm**

User: · Read the four sample paragraphs in Appendix F. · Identify whether each paragraph is a summary, analysis, synthesis, or evaluation. · Write a paragraph explaining the key differences between the four types of writing. 1. Alice Axia’s article di...

**College algebra**

x+5 + x-3 = 5 --- --- --- 7 4 14

**Reference Letter**

Hey Im trying to write a Reference letter, and Im kind of having trouble starting off. I have to imagine myself as an adult who knows me as a student.Then I have to create a made up letter of reference for myself based on what I hope someone would honestly be able to write abo...

**Math**

A jet leaves an airport traveling at a steady rate of 600 km/h. Another jet leaves the same airport 3/4 hr later taveling at 800 km/$ in the same direction. How long will it take the second jet to overtake the first.

**physics**

A revolutionary new diet advertises that one can lose weight simply by eating ice. When one eats ice,chemical energy in the body is used to melt the ice and then raise the temperature of the melted ice to the temperature of the body, 37 degrees Celsius.Past scientific studies ...

**geometry**

rectangle ABCD is similar to rectangle wxyz , with AB corresponding to wx. if AB=24,BC=30 and wx=16 , what is the area of the rectangle wxyz

**Social Studies**

how has the internet changed video voyerism? noone answered when i posted it before

**Social Studies**

how has the internet changed video voyeurism?

**comm 155 **

Describe your experience with credit and credit cards in a brief paragraph using at least five adverbs and five adjectives in your description. Bold the adverbs and underline the adjectives. What is the most effective way to determine whether a word is an adjective or an adver...

**math**

Thank you!

**math**

A spotlight is attached to the ceiling 2 feet from one wall of a room and 3 feet from the wall adjacent. How many feet is it from the intersection of the two walls? a. 4 b. 5 c. 3 square root of 2 d. square root of 13 e. 2 square root of 3

**math**

Muhammad Chabali earns $13,600 per year. He is paid 12 times per year and claims 2 exemptions. His city and state combined tax him at a rate of 10%. How much tax is withheld per pay period?

**Math**

A person is standing next to a flag pole.The person is 6ft tall.She casts a shadow 10 ft long.The flag pole casts a shadow of 45 ft long.How tall is the flag pole.

**pre-calculus**

Which of these has the greatest average rate of change between 2 and 3 : f(x)=x ;g(x)=X^2 ;h(x)=x^3?

**7th grade**

how do you find the range of a math problem if you have all even numbers?

**calculus**

Two positive numbers have a sum of 60. what is the maximum product of one number times the square of the second number? a) 3481 b) 3600 c) 27,000 d) 32,000 e) 36,000 So Idk if this is right, but I have .... x+y=60 p=xy^2 p=x(60-x)^2 P'=-2x(60-x)+(60-x^2) x=.5021 x= 119.498...

**calculus**

Suppose that log2 = a and log3 = b Solve for x in terms of a and b: 6^x = 10/3 - 6^-x

**material science/ chemistry**

why are metals so apt to corrode while polymers are immune to corrosion?

**Physics**

A 250-gram pendulum bob is initially constrained at a 53 degree angle by two strings. When the horizontal string is cut the pendulum begins to swing. As the pendulum bob passes through its equilibrium position, what will be its velocity?

**English**

a. Paragraph one – Describe the subject that you are writing about, and say why this subject is important. b. Paragraph two – State the current situation associated with this subject(s). What is happening now in the field that triggered you to write an article about ...

**Physics**

A 250-gram pendulum bob is initially constrained at a 53 degree angle by two strings. When the horizontal string is cut the pendulum begins to swing. As the pendulum bob passes through its equilibrium position, what will be its velocity?

**Math**

Write the numeral 436eight in base ten

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