Friday

April 18, 2014

April 18, 2014

Total # Posts: 92

**mat 116**

Simplify (2x)^3+2^3x

**Math**

A surveyor, standing 80 ft. from the base of a building, measures the angle of elevation to the top of the building to be 75 degrees. How accurately must the angle be measured for the percentage error in estimating the height of the building to be less than 4%?

**Math**

Use the linear approximation (1+x)^k=1+kx to find an approximation for the function (3+3x)^(1/3) for values of x near zero. Help would be greatly appreciated!

**chemistry**

The volume of a sample of a gas collected over water at 32 Celsius and 752 torr is 627 ml. What will the volume of the gas be when dried and measured at STP? (Vapor pressure of water at 32 Celsius = 35.7 torr)

**Chemistry**

What is the pH of 125 mL of a 1.59 M solution of a monoprotic weak acid, HA (Ka=9.53×10–5), after 29 mL of 0.37 M NaOH is added? I have no Idea how to start this problem and the homework is due tonight, could someone please help me in calculating this? Thanks

**chemistry**

Got the first part. Thanks. I'm still not sure how to convert mols using the balanced equation... sorry, this class got hard really fast.

**chemistry**

How many grams of Mg(OH)2 are needed to neutralize 55 ml of 0.25 M HCl . according to the following reaction. (show all calculations for credit) Mg(OH)2 (aq) + 2HCl(aq) --- MgCl2 (aq) + 2H2O(l)

**Math**

THe ratio of the number of students who own an ipod to those who do not own an ipod is 7 to 8. There are a total of 45 students. How many students in the class do not own an ipod?

**Math**

Scott can travel from Rochester, N.Y., to New York City by bus, train, car, or airplane. He can travel from New York to London, England, by airplane or ship. 1. If Scott must return from London to New York by airplane, and from New York to Rochester by airplane, how many ways ...

**Math**

A quarter is flipped and the outcome is noted. If a head results, then a die is rolled. If a tail results, then the quarter is flipped a second time. 1.What is the probability of obtaining no heads?

**Physics**

Two blocks of lead, one twice as heavy as the other, are both at 50 degrees Celsius. The ratio of internal energy of the heavier block to that of the lighter block is? A)1:2 B)2:1 C)1:1 D)4:1

**Physics**

You throw a 6.2 bowling ball down a bowling alley. The ball is in your hand for a distance of 1.5 meters. Its speed increases from 0 to 16m/s(36mph). How much force did you apply?

**algebra**

Solve by setting up the proper equation to describe the facts given and then carrying out the mathematical calculations to solve for the unknown variable(s). Three times a larger number added to 4 times a smaller number totals 24. When twice the smaller number is subtracted fr...

**algebra**

Solve by setting up the proper equation to describe the facts given and then carrying out the mathematical calculations to solve for the unknown variable(s). The difference between two numbers is 3, and the sum of those two numbers is 21. What are the two numbers?

**helppp pleaseee**

How many days on average can you survive without food or H20?

**personal finance**

explain why a savings and loan association that pays a nominal rate of 4.5% interest, compounded daily, actually pays an effective rate of 4.6%.

**chemistry**

If you begin with 0.345 moles of Calcium Nitrate,how many moles of Potassium Phosphate were needed? How many moles of Potassium Nitrate and Calcium Phosphate are produced?

**Reading**

Dear Ms. Sue, No matter how hard I try, nobody knows a 6th grade definition for the word "Panning". Can you please help?

**physics**

Calculate Earth’s gravitational force on the Shuttle astronauts while orbiting at an altitude of 220 miles (or 354 km) above Earth’s surface.

**Physics**

Right are you sat down ? Well this object nearly killed a work collegue of mine..the company involved are not remotely concerned, even though this projectile came out of the safety zone by 20 metres. Now as the projectile was approximately no more than 2 metres off the ground,...

**Physics**

Right are you sat down ? Well this object nearly killed a work collegue of mine..the company involved are not remotely concerned, even though this projectile came out of the safety zone by 20 metres. Now as the projectile was approximately no more than 2 metres off the ground,...

**Physics**

How do you conclude the answer to the following : What will be the approximate pressure (bar/psi ) for a bullet shaped object weighing 35kg..500mm diameter x 900mm. to travel horizontally for a distance of 30 metres before landing..

**Physics**

How do you conclude the answer to the following : What will be the approximate pressure (bar/psi ) for a bullet shaped object weighing 35kg..500mm diameter x 900mm. to travel horizontally for a distance of 30 metres before landing..

**physics**

The energy stored in a capacitor with capacitance C, having an electric potential difference ΔV, is represented by W = 1/2 C ΔV2. One application of this is in the electronic photoflash of a strobe light, like the one in the figure below. In such a unit, a capacitor ...

**Since**

an orinisams abiliaty to mantian a steadyconditionfor examplebody temputure,is called................

**Business**

You're an individual investor who holds common stock in a large blue chip company. You've received notice of a proposed change. Instead of using the existing statutory method, the proposal calls for the company's board of directors to be elected by the cumulative v...

**science**

A stone is thrown vertically upward with a speed of 11.0 m/s from the edge of a cliff 80.0 m high. How much later does it reach the bottom of the cliff?

**Math**

How do you multiply this polynomial (3m+4n)2

**Math **

How do you find the expression for the perimeter of the flag One side of a triangular flag is two more than five times tue third side

**algebra**

a cube has a side length of 4x-3, express its volume as a polynomial

**physics**

That didn't give me the correct answer

**physics**

What is the total force on the bottom of a swimming pool 22.0 m by 8.9 m whose uniform depth is 1.6 m? What is the absolute pressure on the bottom of a swimming pool? What will be the pressure against the side of the pool near the bottom?

**Physics-Kinetic energy**

Thanks a lot, I figured out the answer.

**Physics-Kinetic energy**

A car has a kinetic energy of 4.32 * 10^5 J when traveling at a speed of 23 m/s. What is its mass? Sorry for re-post and if anyone decides to help please step by step.

**Physics( Checking answer)**

Sorry for re-posting but I really need to know if I did it right. Please someone help! Two 3.0g bullets are fired with speeds of 40.0 m/s and 80.0 m/s respectively. What are their kinetic energies? Which bullet has more kinetic energy? What is the ratio of their kinetic energi...

**Physics(checking answer)**

Two 3.0g bullets are fired with speeds of 40.0 m/s and 80.0 m/s respectively. What are their kinetic energies? Which bullet has more kinetic energy? What is the ratio of their kinetic energies? I got 60 for the first bullet and 120 for the second. I am not sure I used the form...

**CHEM**

I don't understand it still.

**CHEM**

One piece of copper jewelry at 101°C has exactly twice the mass of another piece, which is at 36.0°C. Both pieces are placed inside a calorimeter whose heat capacity is negligible. What is the final temperature inside the calorimeter (c of copper = 0.387 J/gK)?

**Chemistry**

A 30.5 g sample of an alloy at 94.0°C is placed into 48.7 g water at 20.3°C in an insulated coffee cup. The heat capacity of the coffee cup (without the water) is 9.2 J/K. If the final temperature of the system is 31.1°C, what is the specific heat capacity of the a...

**College Physics**

because it says the two forces do the same amount of work, you can tell that the two distances given are the hypotenuse and leg of a right triangle. after that it's just a matter of taking the inverse cos of adjacent/hypotenuse

**10th grade algebra 2**

the third root of 3, times the square root of 9

**Chemistry**

When 20.0 mL of 0.100 M AgNO3 are mixed with 80.0 mL of 0.0100 M Na2CrO4, what is the chromate ion concentration (CrO4^2-)? Ksp for Ag2CrO4 = 9.0 x 10^-12. I think it's 1.0 x 10^-9. Am I right?

**Chemistry**

When you add 25.0 mL of 1.0 M NaF to 20.0 mL of 1.0 M HF,what would be the result? I think it's a basic buffer. Am I right?

**US**

What bold statement was made by the Monroe Doctrine?

**math**

(x+6)(x+5)=2 multiply x by x and x by 5 and 6 by x and 6 by 5 so u get x^2+5x+6x+30=2 2-30 x^2+5x+6x=-28 thats as far as i can get lol hope it helps

**US History**

How did the Mexican War help expand the sectional divide in the U.S.?

**math**

how do I do this? 28 students collected 12,374 soda can tabs. If some of the students collected one more tab than the rest of the students, how many collected 441 and how many collected 442?

**physics**

How do i determine the volume displaced when given mass and volume of an object.

**Math**

What is the probality of rolling a number less than or equal to 2 on the number cube?

**physics**

A 15N block is immersed in a salt water (density = 1030 kg/m3). Determine the buoyant force acting on the block if the spring scale reads 11.8 N.

**physics**

A 15 N block is hung from a spring scale. What is the weight of the block in air?

**physics**

A vertical spring (k = 1040 N/m) is compressed a distance of 11.6 cm. A 47.9 g mass is placed on the spring, then released so the mass flies upward. When the mass is 120 cm above the spring, what is the speed of the mass?

**physics**

Because work=force*distance. The net force is zero for a car traveling along a level road at constant velocity. The zero total work explains why the car’s speed doesn’t change.

**physics**

A 710 kg car travels along US-321. How much working is needed to keep the car traveling at a constant speed of 21.1 m/s around a curve of radius 28.2 m?

**physics**

A person pulls on a 41 kg table with a 203 N force acting at an angle of 27.1 degrees above the horizon. The frictional force on the table is 120 N. What is the speed of the desk after it has moved 2.3 m?

**physics**

A box of mass 11.9 kg is pulled to the right with a horizontal force of 11.3 N. The box moves to the right with constant velocity, 1.6 m/s. Determine the amount of working the pulling force and the normal force do if the box moves 5.7 m.

**physics**

A 50. kg cart is moving across a frictionless floor at 2.0 m/s. A 70. kg child, riding in the cart, jumps off so that the child hits the floor with zero velocity. What was the velocity of the cart after the boy jumped?

**physics**

A 50. kg cart is moving across a frictionless floor at 2.0 m/s. A 70. kg child, riding in the cart, jumps off so that the child hits the floor with zero velocity. What was the velocity of the cart after the boy jumped?

**physics**

An astronaut whose mass is 80. kg carries an empty oxygen tank with a mass of 10. kg. The astronaut throws the tank away with a speed of 2.0 m/s. With what velocity does the astronaut start to move off into space?

**physics**

The driver of a 1024 kg truck traveling 32.6 m/s North on I-77 has to make a sudden stop. If it requires a distance of 57.1 m for the truck to stop, use conservation of energy to find the net force acting on the truck.

**physics**

The driver of a 1024 kg truck traveling 32.6 m/s North on I-77 has to make a sudden stop. If it requires a distance of 57.1 m for the truck to stop, use conservation of energy to find the net force acting on the truck.

**chemistry**

A student placed 10.5 g of glucose C6H12O6 in a volumetric flask, added enough water to dissolve the glucose by swirling, then carefully added additional water until the 100.mL mark on the neck of the flask was reached. The flask was then shaken until the solution was uniform....

**math**

how do you graph a pattern?

**Chemistry**

A scientist wants to make a solution of tribasic sodium phosphate, Na_3PO_4, for a laboratory experiment. How many grams of Na_3PO_4 will be needed to produce 375 mL of a solution that has a concentration of Na^+ ions of 1.10M? I tried multiplying .375 L by 1.10 M to get the n...

**chemistry**

Vanadium forms four different oxides in which the percent by mass of vanadium is respectively 76%, 68%, 61%, and 56%. Find the formula of the first oxide. How would I go about doing this? I tried to use my book but there are no examples of this question. Thanks!

**Chemistry**

? CaSO_4 + AlCl_3 ---> CaCl_2 + Al_2(SO_4)_3 How do I balance this equation so that there are the same number of sulfate ions on both sides of the equation?

**social studies**

physical maps help you see what?

**Technical writing**

Access the user manual for any one of the following programs or applications: • Microsoft® Access • Microsoft® PowerPoint® • Microsoft® Excel • Microsoft® Word • Microsoft® Outlook® User manuals are available via the “H...

**human resources**

Which one of the following is a good way to deal with frustration?

**distance problem**

Suiz drove home at 60mph, but her brother jim, who left at the same time, could only drive at 48mph. when suzie arrived, jim still had 60 miles to go. how far did suzie drive? Please show work

**7th grade science**

i need help creating acrostic puzzles for the 6 differant land biomes.

**6th gr GRAMMAR**

because it was a 6th grade grammar question on my book- they labled it as a 6th grade level. sorry to mislead you.

**6th gr GRAMMAR**

oh, it was an SAT question so i had no choice... thank you!

**6th gr GRAMMAR**

well, i think i'm wrong b/c the answer says it's 'are'. i dont get why tho..

**6th gr GRAMMAR**

so youre saying that prep phrases matter now? so youre saying: everyone of those flyers are green instead of is?

**6th gr GRAMMAR**

but thats a prepositional phrase, ithought those dont matter in determining the plurality of a verb

**6th gr GRAMMAR**

why is : she is one of the few quaterbacks who (is/are) ready for prime time the answer is "are" why is that correct? shouldnt it be is because she is one=singular?

**Algebra**

Trying to figure out how to find all numbers for which the rational expression is undefined. 9/2z+5 Is the answer -5/2 or -10/9? I made a mistake in my typing when I asked the question earlier.

**Algebra**

Trying to figure out how to find all numbers for which the rational expression is undefined. 9/2z+5 Is the answer 0? I made a mistake in my typing when I asked the question earlier.

**Algebra**

Trying to figure out how to find all numbers for which the rational expression is defined. 9/2z+5 Is the answer 0?

**ALGEBRA**

56 over X = 9-X over 2 Can someone tell me what X is please :) Thankyou for your help. If you don't want to just tell me the answer, it would be great if you could give a step-by-step example of how to do one similar to that. or an example of how to do the one I can't ...

**math**

integration by parts: 1. e^(sqrt(3x+9)) 2. sin(lr) are the answers: 1. 2e^(sqrt(3x+9))(sqrt(3x+9)-1) + C 2. -r cos(lnr) + sin(lr) + C

**calculus**

integration by parts: 1. e^(sqrt(3x+9)) 2. sin(lr) are the answers: 1. 2e^(sqrt(3x+9))(sqrt(3x+9)-1) + C 2. -r cos(lnr) + sin(lr) + C

**trig help**

I need help finding sinA if cosA=(-3/5) and A is greater than 90 degrees, but less than 180 degrees. Draw the quadrant diagram. In the upper left quadrant, greater then ninety degrees, but less than 180, cosine is neg, and sine is positive. Draw a three, four, five right trian...

**biology**

analogy of a cytoskeleton enter Cytoskeleton Tutorial http://www.ccps.k12.va.us/news_release/rh/cell_biology.htm

**Ethics**

I have an assignment to due on Hispanic American Diversity. I have to chose 4 Hispanic groups. I chose Mexican Americans, Puerto Ricans, Dominican's, and Cubans. I have to write a research paper and identify the linguistic, political, social, economic, religious and famili...

**mole**

how do i find... howmany moles are in a specified mass mols = grams/molar mass

**Pyiscal science**

When nickel combines with flourine to form nickel [3] floride, the charge of the nickel ion is All of my references list NiF2 as the formula. Therefore, Ni would have a charge of +2.

**word unscramble**

oelsanlchtoa Try these: http://www.ssynth.co.uk/~gay/anagram.html http://www.unscramble.net =) 1. ssiearf 2. oisb 3.smgleeu

**science**

how was sulfur named? http://www.vanderkrogt.net/elements/elem/s.html

**Math**

having trouble solving equation 8+3x6-4-1=13 can anyone help we have tried everything and it's not working out for me is that 3x or 3*6 3*6 Are you sure you put the right equation? yes. 8+3*6-4-1=13 what do the instructions say? Is this a grouping problem? because 8+3*(6-4...

**U.S. Government**

Thi‚“ is about James Madisonfs@Federalist Essays. My question ishWhy does madison want to ratify this constitution?h Anyone please answer that question. To ratify means to formally approve the consitution. This means that the states accept the...

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