Thursday

July 24, 2014

July 24, 2014

Total # Posts: 349

**Trig**

The problem is: an airplane is flying in the direction 120 degrees with an airspeed of 320 mph, and a 35 mph wind is blowing in the direction 60 degrees. The question ask to find the true course and the ground speed. To solve the problem I have done this: Flying 120sin 320_+12...

**chemistry**

By titration it is found that 20.5 mL of 0.168 M NaOH(aq) is needed to neutralize 25.0 mL of HCl(aq). Calculate the concentration of the HCl solution

**chemistry**

By titration it is found that 20.5 mL of 0.168 M NaOH(aq) is needed to neutralize 25.0 mL of HCl(aq). Calculate the concentration of the HCl solution

**algebra**

A tailgater

**Math**

I need help with 12 over 25 times 10 over 14 times 7over 18 and then putting it into simplest form

**Math**

What is the pattern for 2,6,4,12,10,30,28

**Probability**

According to the record of the registrar's office at a state university, 40% of the students are freshman, 25% are sophomore, 20% are junior, and the rest are senior. Among the freshmen, sophomores, juniors, and seniors, the portion of students who live in the dormitory ar...

**Geometry**

Christopher wants to determine how far away a helicopter is from where he is standing. He knows the helicopter is sitting on the edge of a roof of an apartment building that is 400 feet high and 1,050 feet from where he is standing. Using the information in the drawing, approx...

**Probability - Math**

According to the record of the registrar's office at a state university, 35% of the students are freshman, 25% are sophomore, 16% are junior, and the rest are senior. Among the freshmen, sophomores, juniors, and seniors, the portion of students who live in the dormitory ar...

**accounting**

Richard Hamilton has a fast - food franchise and must pay a franchise fee of $35000 plus 3% of gross sales. In terms of cost behavior, the total cost is a: a) variable cost b) fixed cost c) step - fixed cost d) mixed cost

**Accounting**

An example of a committed fixed cost would be: a) taxes on real estate b) management development programs c) public relations d) advertising programs

**Chemistry**

Carbon monoxide and chlorine gas react to form phosgene: CO(g)+Cl2(g)⇌COCl2(g) Kp = 3.10 at 700 K If a reaction mixture initially contains 319torr of CO and 220torr of Cl2, what is the mole fraction of COCl2 when equilibrium is reached?

**Physics**

2.30s

**algebra**

If shorter boards are cut from one long board, how many cuts will it take to have 12 shorter boards if there is no waste left?

**Math**

If $1500 is invested at an interest rate of 3.5% per year, compounded continuously, find the value of the investment after 3 and 6 years. What formula would i use?

**Physics**

How far vertically does it move? What is the final mechanical energy (the sum of U and the two types of K)? What, then, was the initial mechanical energy? What is the rotational inertia (see Table 10-2)? How is the angular speed related to the com speed?

** chemistry **

a student was asked to prepare 100.0 mL of 0.0200 M solution of HCL from 0.400 M solution of HCL. in order to do this he measured 5.0 mL of 0.400 M HCL with a graduated cylinder, transfered this amount to a 100 mL beaker, added 95 mL of deionized water measured with a graduate...

**algebra 1**

a number is less than one fourth of the sum of three times the number and four. can someone please explain to me how they got this answer and can someone please show me each step.

**Economics**

The purpose of advertising & other forms of non-price competition by a firm is to shift the Demand curve to the A)Right B)Left & A)Make it more elastic B)Make it more inelastic What is the reason behind the answer?

**chemistry**

to get the grams of NaClO in the titrated bleach sample I calculated .000721 x 74.44217 = .0536 which was correct. For the previous question I asked I put in the same answer as you said and it is incorrect.

**chemistry**

use this to get the mass of the bleach? It is telling me my answer is incorrect.

**chemistry**

use this to get the mass of the bleach? It is telling me my answer is incorrect.

**chemistry**

5 mL of undiluted bleach was used. Calculate the mass in grams of undiluted bleach that was in the sample of bleach titrated.

**chemistry**

one last question. From same set up. Assuming all of the hypochlorite ion comes from sodium hypochlorite, calculate the grams of NaClO in the titrated bleach sample.

**chemistry**

thank you

**chemistry**

sorry this is for a prelab. But yes.

**chemistry**

Suppose a student diluted and titrated a bleach unknown. A single titration was performed which required 14.42 mL of 0.100 M Na2S2O3. The density of the original, undiluted bleach unknown was 1.042 g/mL. calculate the number of moles of ClO- in the sample titrated.

**Microeconomics**

Why do "price-maker" firms never want to produce in the inelastic part of the demand curve??

**Algerbra **

These problems I really don't understand and really need serious help :) 1.What the product of (5.1 x 10^3)x (3.2 x 10^3)?(Please express your answer in scientific notation) 16.32 x 10^6 1.632 x 10^7 16.32 x 10^9 1.632 x 10^10 2.What is the product of (7.28 x 10^-2)x(9.1 x...

**Math**

These problems I really don't understand and really need serious help :) 1.What the product of (5.1 x 10^3)x (3.2 x 10^3)?(Please express your answer in scientific notation) 16.32 x 10^6 1.632 x 10^7 16.32 x 10^9 1.632 x 10^10 2.What is the product of (7.28 x 10^-2)x(9.1 x...

**chemistry **

DrBob222 - it says my answer should be a number.

**Chemistry**

THANK YOU!!!!

**Chemistry**

50.0mL of 1.04moles HA is added to 50.0mL if 0.90moles NH4OH.With a 1:1 stoichiometric ratio. What is the limiting reactant in moles of this reaction.

**Math**

week 3

**English**

I have to write a thesis paper with the main, broad idea being the similarities and differences between The Epic of Gilgamesh and Toy Story. I have no idea what the connections, or lack thereof, are between the two.

**Math**

How do I solve b+12<31 using an inverse operation?

**Chem**

H. Using the technique outlined in this lab, a student decided to test wastewater for the presence of phosphate. The first reading produced an extremely dark blue color and a concentration higher than 3ppm. After performing a 10 ml dilution, the colorimeter measured a resistan...

**Chemistry**

If the solubility of CaF2 (s) in water is 5.0 x 10^-3. The solubility will be A. The same in 0.10 M NaF B. less than 0.10 M NaF C. Higher in 0.10 M NaF D.None of the above

**Chemistry**

If the solubility of CaF2 (s) in water is 5.0 x 10^-3 M. The solubility will be

**Calc**

A street light is at the top of a 16ft tall pole. A woman 6ft tall walks away from the pole with a speed of 6ft/sec along a straight path. How fast is the tip of her shadow moving when she is 30ft from the base of the pole?

**Calculus**

Correction: If the ladder makes an angle 1.25 radians with the ground, touches the top of the fence, and just reaches the wall, the distance along the ladder from the ground to the top of the fence=? The distance along the ladder from the top of the fence to the wall is=?

**Calculus**

A fence 3 feet tall runs parallel to a tall building at a distance of 3 feet from the building. What is the length of the shortest ladder that will reach from the ground over the fence to the wall of the building. Answer the following: The distance along the ladder to the top ...

**Calculus**

Thank you for your help!

**Calculus**

Find the point on the line 4x+3y-4=0 which is closest to the point (5,2)

**Math**

What is 538 divided by -63

**personal finance**

Jo owns 150 shares of Delta General stock. She purchased the stock for $24 a share. She sold the stock for $30 per share. The commissions required to buy and sell her stock cost her $120. Assuming that she received no dividends (income) during the time she owned the stock, wha...

**Chemistry**

The experimentally measured and generally accepted value for the molar volume of Na is about 23 cm3/mol. Which of the following best explains why the value calculated in Part B is significantly smaller than the measured values? Part B Answer 16.3 cm3/mol Which one would it be?...

**government**

The __________ gave the national government the power to prevent states from violating the rights of their citizens, granted the freed slaves citizenship, and gave the federal courts the power to oversee state legislation.

**Physics, so confused**

A cart of mass M1 = 5.00 kg and initial speed = 3.00 m/s collides head on with a second cart of mass M2 = 3.00 kg at rest. Assuming that the collision is elastic, find the speed of M2 after the collision. I am not sure how to find this answer without having a V2 for the first ...

**chemistry**

if a total of 18.6 mol of NaHCO3, and 6.2 mol of C6H8O7 react, how many moles of CO2 and Na3C6H5O7 will be produced?

**U.S. Government**

Which powers delegated or implied could also be referred to as expressed powers and why?

**Chemistry**

How many grams of NH3 can be produced if 105g of NH4OH are completey decomposed?

**Science**

How many grams of NH3 can be produced if 105g of NH4OH are completey decomposed?

**Math**

The old 30-question AHSME was graded as follows: Students were awarded 5 points for a correct answer, 0 points for a wrong answer, and 2 points if left blank. The maximum score was 150, and the minimum score was 0. Find all integer scores between these values that are not poss...

**Math**

What times what equal 60 and adds to get 7

**Math**

Which set of side lengths shows similar triangles? Triangle ABC : 40, 20, 50; Triangle XYZ: 10, 12.5, 10 Triangle ABC : 30, 20, 30; Triangle XYZ: 40, 30, 20 Triangle ABC : 110, 80, 60; Triangle XYZ: 12, 16, 22 Triangle ABC : 32, 20, 32; Triangle XYZ: 40, 26, 26

**Physics**

A 1000 kg car is accelerated from rest to 100 miles/hour in 10 seconds. Find the output power of this car

**Chemistry**

You have .5g of copper. If the nitric acid is 16 M HNO3, how many milliliters of nitric acid will react exactly with that amount of copper. I know that when I get that volume I will triple it so that there will be excess acid and the copper will be the limiting reactant.

**Chemistry **

Burning an empty Styrofoam container results in volumes of black sooty flames. On the basis of this observation alone, to what class of hydrocarbons would you suspect a component of the polystyrene polymer found in Styrofoam belongs? Explain.

**Math**

I'm doing a project and I have looked everywhere for this answer. It's if using 50 math tiles how can you make the smallest area?

**algebra**

A sheet of cardboard with an area of 10 square feet is made into a closed rectangular box. The four sides of the box have the same area and two ends have the same area. The area of each of the four equal sides is twice the area of each end. What is the area of each face of the...

**Math**

f(x)=3/(x+1) g(x)=(x^3)/5 h(x)=x^2+7x+10 a. f(x)=10 b. f(x)=g(x) c. g(x)=h(x) d. f(x)=h(x) I am told to solve the equations, but the term "solve" is so vague. I don't know what I'm doing. Please help lead me in the right direction. Thank you.

**Science**

1.8 mol Zn and 7.3 mol HCl react according to the equation Zn + 2 HCl −→ ZnCl2 + H2 . If the limiting reactant is Zn, calculate the amount of ZnCl2 formed. Answer in units of mol

**Geography**

What is the capital of the landlocked country that borders Russia to the north and China to the south. Also, is this correct? Eastern Brazil has a higher elevation that western Brazil. Thanks!

**physics**

Omar races his bicycle for 152m. A wheel of his bicycle turns 38times as the bicycle travels this distance. What is the diameter of the wheel?

**AP US History **

In the early 19th century, Americans sought to resolve their political disputes through compromise, yet by 1860 this no longer seemed possible. Analyze the reasons for this change. Im having problems finding information to support this. This is my introduction: In the history ...

**Help!! **

1. Samuel is 2/3 as old as his brother. In five years, he will be 3/4 as old as his brother will be. Find their present ages. a. If x = the brother’s age now, write an expression for Samuel’s present age in terms of x. b. Write an expression for the brother’s ag...

**chemistry**

What are the steps in finding the balanced equation for the complete combustion of benzene?

**Math Project..Please help me..**

1. Samuel is 2/3 as old as his brother. In five years, he will be 3/4 as old as his brother will be. Find their present ages. a. If x = the brother’s age now, write an expression for Samuel’s present age in terms of x. b. Write an expression for the brother’s ag...

**Math**

How do you write "3 more than the sum of x and y"

**math**

if james spends 5/6 of his weekly allowance seeing a movie how many dollars of his allowance do he have left

**math**

if james spends 5/6 of his weekly allowance seeing a movie how many dollars of his allowance do he have left

**math**

if james spends 5/6 of his weekly allowance seeing a movie how many dollars does he have left? if a movie ticket cost 7.50 what is james weekly allowance?

**Math**

Cody has a circular fish pond with a diameter of 6.4 feet around which he wants to put a sidewalk. He has enough concrete left over to cover an area of 65 square feet. Assuming the sidewalk is of uniform width, how wide can the sidewalk around the pond be?

**Math**

I need a better explanation.. or atleast tell me which answer is for which problem

**Math**

1. Samuel is 2/3 as old as his brother. In five years, he will be 3/4 as old as his brother will be. Find their present ages. a. If x = the brother’s age now, write an expression for Samuel’s present age in terms of x. b. Write an expression for the brother’s ag...

**3rd grade math**

How can you use the multiplication facts for 3 to help fond the multiplication facts for 9?

**Math**

Which expression is equal to log243

**chemistry**

describe basic steps to take re-crystalizing synthesized aspirin. using two solvents to perform this task (ethanol and water)which solvent should be used to dissolve the aspirin and which one should force it out of the solution

**3rd math**

What two multiplication facts can be added to find 3x7

**science**

Two blocks of different temperatures are brought together. Block A is a 360.0-kg block is made of Material X which has a temperature-dependent specific heat. Its initial temperature is TA = 200.0¡ã C. Block B is a 1000.0-kg iron block with an initial temperature T...

**Math**

desiree

**Math**

desiree

**math**

Dave swam 6 laps and did 9 dives at the swimming pool.crystal did 4 drives and swam 8 laps.how many more laps than drives did crystal and Dave do?

**Math**

Estimate the sum by rounding: 7.68+3.52

**geography**

Please help. I think that the three seas that surround the Philippines are: The South china sea, the Philippine Sea and the Sulu sea. Is this correct? Thanks

**math**

so when the quetion comes like this, x and y are impossible in one side together? but B also is y on one side and x on the other side, i am so confused.

**math**

I couldn't even understand the question, can anyone help?

**math**

which of the following is an example of a proportional relationship between x and y? A. y = 2 B. y = 3x C. 4y + 4x = 6 D. 4y - 2 = 2x - 4

**7th Grade Math**

thank you Ms.Sue :)

**Chemistry **

A galvanic (voltaic) cell consists of an electrode composed of aluminum in a 1.0 M aluminum ion solution and another electrode composed of fold in a 1.0 M gold (III) ion solution connected by a salt bridge. Calculate the standard potential for this cell at 25 degrees celcius.

**science**

Explain why the temperature of water might increase when a solution forms.

**chemistry**

Give the number of each type of ion present in each of the ionic compounds formed from the combination of the indicated metal and acetate, {\rm C_2H_3O_2}^-, ion.

**3rd math**

The flower shop just recieved a shipment of 432 roses. They need to fill an order for 273 roses. Use any method to how many roses they will have left.

**3rd math**

April needs to estimate the sum of 427 and 338 should she round to the nearest ten or hundred to get the closer answer? Explain.

**physics**

An electron of mass 9.11 10-31 kg has an initial speed of 2.85 105 m/s. It travels in a straight line, and its speed increases to 6.93 105 m/s in a distance of 5.50 cm. Assume its acceleration is constant.

**science**

a solution of sodium chloride in water has a vapor pressure of 19.5 at 25C what is the mole fraction of NaCl solute particles

**physics**

Two students are on a balcony 24.4 m above the street. One student throws a ball, b1, vertically downward at 20.3 m/s. At the same instant, the other student throws a ball, b2, vertically upward at the same speed. The second ball just misses the balcony on the way down. (a) Wh...

**physics**

Two students are on a balcony 24.4 m above the street. One student throws a ball, b1, vertically downward at 20.3 m/s. At the same instant, the other student throws a ball, b2, vertically upward at the same speed. The second ball just misses the balcony on the way down. (a) Wh...

**Lab Math**

A stock solution of inulin has a concentration of 500mg/ml. From this stock 0.05ml is diluted with 0.05ml of sterile saline. After 30 min blood is sampled and produces a result of 50ug/ml. What is total extravascular volume? I just need to find what the diluted part is so I ca...