# Brittany

Popular questions and responses by Brittany-
## Physics

At which point or points is the electric field zero in figure? I can not post the picture, but this is what it looks like: 1 2 3 4(4+)5 6(-)7 8 9 10 The (4+) is a proton with 4 charges. The (-) is an electron with 1 charge. They are on a number line 1-10.

*asked on August 29, 2016* -
## chemistry

A chemist determined by measurements that 0.0850 moles of mercury participated in a chemical reaction. Calculate the mass of mercury that participated in the chemical reaction. Round your answer to 3 significant digits.

*asked on October 1, 2015* -
## Chemistry

Write the molecular equation and the net ionic equation for each of the following aqueous reactions. Ca(NO3)2 + K2CO3 FeSO4 + NaCl NiCl2 + NaBr

*asked on September 30, 2008* -
## Chemistry

What is the chemical name for BeCrO4*5H2O?

*asked on September 7, 2011* -
## Gen Chem

A mixture of NaCl and sucrose (C12H22O11) of combined mass 10.2 g is dissolved in enough water to make up a 250 mL solution. The osmotic pressure of the solution is 8.29 atm at 23°C. Calculate the mass percent of NaCl in the mixture.

*asked on February 4, 2016* -
## AP Physics

You can obtain a rough estimate of the size of a molecule by the following simple experiment. Let a droplet of oil spread out on a smooth water surface. The resulting oil slick will be approximately one molecule thick. Given an oil droplet of mass 10.00

*asked on September 4, 2013* -
## chemistry

What is the solubility of silver carbonate in 0.1 M Na2CO3

*asked on November 17, 2011* -
## Physics

The front 1.20 m of a 1550 kg car is designed as a "crumple zone" that collapses to absorb the shock of a collision. (a) If a car traveling 26.0 m/s stops uniformly in 1.20 m, how long does the collision last? cannot_evaluate s (b) What is the magnitude of

*asked on December 9, 2010* -
## math

The table shows the outputs y for different inputs x: Input (x) 3 7 11 15 Output (y) 4 6 8 10 Part A: Do the data in this table represent a function? Justify your answer. (3 points) Part B: Compare the data in the table with the relation f(x) = 5x – 21.

*asked on December 3, 2015* -
## Chemistry

In the Sandwich Shop, select the "Cheese sandwich" option and observe the equation given for the preparation of a cheese sandwich. In the equation, set the number of bread slices to "2" and the number of cheese slices to "1." You will see that the product

*asked on April 14, 2015* -
## Chemistry

Boron has only two naturally occurring isotopes. The mass of boron-10 is 10.01294 amu and the mass of boron-11 is 11.00931 amu. Use the atomic mass of boron to calculate the relative abundance of boron-10. Atomic mass of boron is 10.81 How do I solve this?

*asked on September 7, 2011* -
## Business Communication

Please Break up the sentence. Reserving the property requires a $500 security deposit , which will be refunded unless there is damage to the property or evidence that there has been smoking in the cottage or a pet on the premises or if the reservation is

*asked on February 1, 2017* -
## Precalculus

The quarterback of a football team releases a pass at a height of 7 feet above the playing field, and the football is caught at a height of 4 feet, 30 yards directly downfield. The pass is released at an angle of 35 degrees with the horizontal. The

*asked on April 21, 2014* -
## Chemistry

Iron(III) oxide reacts with carbon monoxide gas to form solid iron metal and carbon dioxide gas: Fe2O3 + 3 CO --> 2 Fe + 3 CO2 If you begin the reaction with 84.34 g of iron(III) oxide and 68.87 g of CO, which reactant will be in excess at the end of the

*asked on November 5, 2012* -
## Chemistry

Carbon-12 contains 6 protons and 6 neutrons. The radius of the nucleus is approximately 2.7 (femtometers) and the radius of the atom is approximately 70 (picometers). The volume of the nucleus is 8.2×10^−8 pm^3 And the volume of the atom is 1.4×10^6

*asked on August 31, 2011* -
## Literature / Short story I

1. During what part of “Bernice Bobs Her Hair” does Bernice cut Marjorie’s braids? A. Climax C. Falling action B. Rising action D. Epiphany 2. The label detective novel is an example of A. a character study. C. a genre. B. informational reading. D. a

*asked on March 13, 2009* -
## calculus

Find the rate of change of total revenue, cost, and profit with respect to time. Assume that R(x) and C(x) are in dollars. R(x)= 55x - 0.5x^2 , C(x)=5x + 20, when x=40 and dx/dt=30 units per day 1. The rate of change of total revenue

*asked on February 21, 2020* -
## Physics

Space explorers discover an 8.7×10^17kg asteroid that happens to have a positive charge of 4400 C. They would like to place their 3.3×10^5kg spaceship in orbit around the asteroid. Interestingly, the solar wind has given their spaceship a charge of

*asked on August 25, 2016* -
## math

Find the original price of a pair of shoes if the sale price is $56 after a 20% discount

*asked on February 24, 2014* -
## math

Titus deposited $1,508.49 in a savings account that earns 4.2% simple interest. What will Titus's account balance be in 8 months?

*asked on August 29, 2013* -
## Chemistry

The density of an unknown gas is 1.72 g/L at 750.0 torr and 30.0°C. Which of the following could be the unknown gas? a. CS2 b. NO c. N2O d. NH3 e. N02

*asked on November 6, 2012* -
## Chemistry

Which of the following reactions will result in a reduced total pressure? a. CH4(g) + 2O2(g) → CO2(g) + 2H2O(g) c. 2HI(g) → H2(g) + I2(g) b. 2N2O(g) → 2N2(g) + O2(g) d. 2H2(g) + O2(g) → 2H2O()

*asked on November 6, 2012* -
## Chemistry

Methanol (CH4O) is converted to bromomethane (CH3Br) as follows: CH4O + HBr --> CH3Br + H2O If 12.23 g of bromomethane are produced when 5.00 g of methanol is reacted with excess HBr, what is the percent yield?

*asked on November 4, 2012* -
## geometry

PLEASE HELP WITH A FEW QUESTIONS triangle ABC has side lengths 8, 15, and 17 do the side lengths form a pythagorean triple? the length of the hypotenuse of a 30-60-90 triangle is 7 find perimeter to approach the runway, a pilot of a small plane must begin

*asked on May 23, 2012* -
## physics

A sled is pulled at a constant velocity across a horizontal snow surface. If a force of 100 N is applied to the sled at an angle of 40 degrees to the ground, what is the force of friction between the sled and the snow?

*asked on October 26, 2009* -
## Algebra 1

I am having trouble with a few questions....Wondering if you could help...My answers have the *** by them..... 1. A lab is growing bacteria in a culture dish. The amount of bacteria in the dish doubles every 3 hours. Initially, there are 500 bacteria in

*asked on September 29, 2016* -
## physics

A person is standing at the edge of the water and looking out at the ocean (see the drawing). The height of the person’s eyes above the water is h=1.6 m, and the radius of the earth is R=6.38x10^6 m (use as a precise value). (1) How far is it to the

*asked on January 23, 2011* -
## Calculus

A 0.3 ml dose of a drug is injected into a patient steadily for 0.35 seconds. At the end of this time, the quantity, Q, of the drug in the body starts to decay exponentially at a continuous rate of 0.4 percent per second. Using formulas, express Q as a

*asked on January 20, 2011* -
## Intro to ECONOMICS

the basic reason suburban stores are more likely than downtown stores to provide free parking for their customers is that.. the cost of using land is higher in the downtown area?

*asked on October 11, 2010* -
## Physics

We can reasonably model a 75 W incandescent light bulb as a sphere 6.0 cm in diameter. Typically, only about 5% of the energy goes to visible light; the rest goes largely to non-visible light infrared radiation. (a) What is the visible light intensity (in

*asked on August 11, 2010* -
## Pre-Calc

Establish the identity. sinx + cosx/sinx - cosx = 1+2sinxcosx/2sin^2x-1

*asked on March 30, 2009* -
## Chemistry

In the following reaction, how many grams of ferrous sulfide will produce 0.56 grams of iron oxide? 4FeS+7O2->2Fe2O3+4SO2 The molar mass of ferrous sulfide is 87.92 grams and that of iron oxide is 159.7

*asked on June 26, 2013* -
## English

An international agreement that aims to reduce carbon dioxide emissions and the presence of greenhouse gases. Countries that ratify the Kyoto Protocol are assigned maximum carbon emission levels and can participate in carbon credit trading. Emitting more

*asked on April 8, 2013* -
## calculus

On the graph of f(x)=6sin(8πx), points P and Q are at consecutive lowest and highest points with P occuring before Q. Find the slope of the line which passes through P and Q.

*asked on January 15, 2011* -
## math

Factor the four-term polynomial. mn - 15 + 3m - 5n

*asked on February 15, 2010* -
## Physics

Suppose you were to drop a 9 lb bowling ball from the top of the Empire State Building, which is about 440 m tall, onto a machine that would catch it and then convert its kinetic energy into electrical energy. For how long could the resulting energy light

*asked on November 24, 2017* -
## Chemistry

Calculate the moles of aqueous calcium carbonate present in a 50.00mL sample of a calcium carbonate standard solution, assuming the standard is known to have a hardness of 125 ppm (hardness due to CaCO3). You can assume that the density of the sample is

*asked on September 25, 2015* -
## pharmaceutical math

You need to prepare 180g of a 10% cream using 30% stock cream and a cream base. How much is needed for each

*asked on December 10, 2014* -
## Physical science

Help Please . Aisha drops an antacid tablet in water and times how long it takes to dissolve. Which of the following will decrease the reaction rate? A.increasing water temperature B.decreasing water temperature C.using more water

*asked on March 22, 2013* -
## Algebra/Math

A total of 504 tickets were sold for the school play. They were either adult tickets or student tickets. The number of student tickets sold was three times the number of adult tickets sold . How many adult tickets were sold?

*asked on November 14, 2012* -
## Chemistry

The flame in a torch used to cut metal is produced by burning acetylene(C2H2) in pure oxygen. Assuming the combustion of 1 mole of acetylene releases 1251kj of heat, what mass of acetylene is needed to cut through a piece of steel if the process requires

*asked on November 8, 2012* -
## Chemistry

Which of the following gases will effuse through a hole in a balloon fastest? a.Kr b.NO c.N2O d.NO2 e.ArNO2

*asked on November 6, 2012* -
## Chemistry

In an experiment, 25.0 mL of a gas with a pressure of 1.00 atm is contained in a balloon at 25.0°C. The balloon is then cooled to 5.0°C, and the pressure is found to be 0.750 atm. What is the volume of the gas under the new conditions?

*asked on November 6, 2012* -
## geometry

PM is the median of trapezoid KLNO. If ON = 24 centimeters and KL = 12 centimeters, which is the length of PM

*asked on September 26, 2012* -
## Calc

The temperature at any point in the plane is given by the function T(x,y)= 100/(x^2+y^2+1). Find the direction at the point (3,2) in which the temperature does not increase or decrease. Help, please? Thanks!

*asked on February 28, 2011* -
## chemistry

combustion of 0.356g of an unknown metal sample in oxygen gives 0.452g of an oxide in the form of mO2, Identify the unknown metal?

*asked on November 23, 2010* -
## Payroll Accounting

Help with my Payroll Accounting Final Project. Class AC122-05. Please. I am so lost.

*asked on November 8, 2009* -
## science

what are the vas deferens?

*asked on May 26, 2009* -
## MATH

A kennel owner has 164 ft of fencing to enclose a rectangular region. He wants to subdivide it into 3 sections of equal length. If the total area of the enclosed region is 576 square ft what are the dimensions. I know that the answer is 18 ft by 32 ft or

*asked on October 19, 2008* -
## Accounting

The materiality concept implies that if an error is large enough or could effect the decisions of its users, a correction is absolutely necessary. True or False?

*asked on September 1, 2007* -
## Physical education

Obesity begins at home?

*asked on September 4, 2018* -
## Chemistry

What mass of carbon dioxide is produced from the complete combustion of 2.10×10−3g of methane? Express your answer with the appropriate units.

*asked on April 14, 2015* -
## Chemistry

Find the number of moles of water that can be formed if you have 226mol of hydrogen gas and 108mol of oxygen gas. Express your answer with the appropriate units.

*asked on April 14, 2015* -
## statistics

The human resources department of an engineering company gives IQ tests to a randomly selected group of new hires every year. They claimed that the mean IQ score of new hires, , from this year is greater than or equal to the mean IQ score of new hires, ,

*asked on August 3, 2014* -
## pre calculus

a gun with a muzzle velocity of 1200 feet per second is fired at an angle of 6 degrees above the horizontal. find the component form of a vector. verify the magnitude

*asked on May 5, 2014* -
## American Governent

List and Explain three duties of members of the executive office of the president.

*asked on November 11, 2013* -
## algebra 1

Natalie performs a chemistry experiment where she records the temperature of an ongoing reaction. The solution is 93.5º C after 3 minutes; 90º C after 5 minutes, 84.8 C after 9 minutes; 70.2º C after 18 minute; 54.4º C after 30 minutes; 42.5ºC after

*asked on May 1, 2013* -
## physical science

Help please. Aisha drops an antacid tablet in water and times how long it takes to dissolve. Which of the following will decrease the reaction rate?

*asked on March 22, 2013* -
## PRE-ALGEBRA

An adult house cat could be about 1____ high.

*asked on January 18, 2013* -
## Chemistry

Pentane is a small liquid hydrocarbon, between propane and gasoline in size C5H12. The density of pentane is 0.626g/ml and its enthalpy of combustion is ΔHcomb =-3535kj/mol. Estimate the fuel valve and the fuel density of pentane.

*asked on November 8, 2012* -
## Chemistry

Which one of these samples contains the smallest number of molecules? a. 1.0 L of H2 at STP (0°C and 1atm) d. 1.0 L of N2 at 0°C and 800 torr b. 1.0 L of N2 at STP e. 1.0 L of He at STP c. 1.0 L of H2 at 20°C and 760 torr

*asked on November 4, 2012* -
## math

the product of a 1 digit number and a 2-digit number number is 284 what is the answer

*asked on October 20, 2012* -
## biology

Explain the importance of carbon's ability to form covalent bonds in straight chains, branched chains, or rings.

*asked on January 24, 2012* -
## Statistics

A study shows that 10% of americans are left-handed. Find the probability that at most one student is left handed in a class of 20 students.

*asked on December 9, 2011* -
## Trig

1. Establish the identity: sin(theta+3pi/2)=-cos(theta) 2. Find the exact value of 2(theta) if sin(theta)=5/13 3. Show that: csc2(theta)-cot2(theta)=tan(theta) 4. Find the exact value of tan(cos^-1(square root of 3/2) 5. Approximate the value rounded to

*asked on December 7, 2011* -
## science

which of the following is a testable hypothesis helium, ammonia, oxidation-reduction?

*asked on December 6, 2011* -
## english

keep high aspirations moderate expectations and small needs. whats does this means

*asked on May 13, 2010* -
## Physical Science

A red light source and a green light source shine on a white screen. what color will the screen be? Explain your answer. If a blue object is placed in front of the screen, what color will it be? explain your answer

*asked on November 14, 2009* -
## Physical Science

A 28.0kg block is connected to an empty 1.80kg bucket by a cord running over a frictionless pulley. The coefficient of static friction between the table and the block is 0.41 and the coefficient of kinetic friction between the table and the block is 0.35.

*asked on September 28, 2009* -
## math

3 points Save When Patricia sells her General Motors common stock at the same time that Brian purchases the same amount of General Motor's stock, General Motors receives: the "spread" between the Bid and Ask of the transaction. the dollar amount of the

*asked on July 24, 2008* -
## science

how does radiation, conduction, and convection work in the human body I found this that may be of some help. Scroll down about 3/4 to the end to a small symbolic picture of a human being. Parts are labeled to show where conduction, convenction, and

*asked on December 13, 2006* -
## Physics

Two dogs are playing tug-o-war. The first dog pulls with the force of 400N and the second dog is hanging on but is being pulled towards the first dog at a constant velocity. What is the force of friction between the second dog's feet and the ground?

*asked on November 7, 2017* -
## physics

When the wind is blowing an average of 31.8 mph, a wind tower with its propellors centered at a height of 80 m off the ground is supplied with energy at a rate of 14.4 kW. A large bank of batteries collects the energy from the wind tower. If the efficiency

*asked on November 28, 2016* -
## Physics

Starting from rest, a 2500 kg helicopter accelerates straight up at a constant 1.7 m/s2. What is the helicopter's height at the moment its blades are providing an upward force of 29 kN? The helicopter can be modeled as a 2.6-m-diameter sphere. How do you

*asked on August 24, 2016* -
## geometry

Line AB is parallel to line CD. What is the sum of the measure of angle K and the measure of angle Y?

*asked on April 5, 2016* -
## Algebra I

I got the following question but since I haven't reached a definite answer I'm wonder if I've solved it correctly: Write the slope-intercept form of an equation of the line that passes through (-2,5) and has an undefined slope. I got: 5=-2m+b 5--2m=b

*asked on September 22, 2015* -
## Chemistry

What mass of oxygen is needed for the complete combustion of 2.10×10−3g of methane? Express your answer with the appropriate units.

*asked on April 14, 2015* -
## Chemistry

What mass of water is produced from the complete combustion of 2.10×10−3g of methane? Express your answer with the appropriate units.

*asked on April 14, 2015* -
## Chemistry

Consider the reaction 2D2(g)+O2(g)→2D2O(l) What is the mass of heavy water, D2O(l), produced when 7.65g of O2(g) reacts with excess D2(g)? Express your answer with the appropriate units.

*asked on April 14, 2015* -
## Chemistry

Balance the given chemical equation using whole-number coefficients. ?D2(g)+?O2(g)→?D2O(l) Enter the coefficients in order separated by commas (e.g., 1,3,2, where 1 indicates the lack of a coefficient).

*asked on April 14, 2015* -
## Chemistry

How many molecules (not moles) of NH3 are produced from 1.17×10−4g of H2? Express your answer numerically as the number of molecules.

*asked on April 14, 2015* -
## Chemistry

How many grams of H2 are needed to produce 11.80g of NH3? Express your answer numerically in grams.

*asked on April 14, 2015* -
## math

The sum of two consecutive integers is –49. Write an equation that models this situation and find the values of the two integers.

*asked on March 19, 2015* -
## Math

A savings account at Xyz bank offers 4% interest, compounded annually. How much money must I invest today in order for the account to grow to $5,000 in ten years? Answer to the nearest whole dollar.

*asked on November 21, 2014* -
## Physics

The four masses shown in the figure below are connected by massless, rigid rods. moi-cog-problem-fig (a) Find the coordinates of the center of gravity of this object if MA = 120 g and MB = MC = MD = 180 g x = ? m y = ? m (b) Find the moment of inertia

*asked on October 28, 2014* -
## Math

Find the equation of the tangent line to the graph of y=3cot^4x at x=pi/4 3cot^4(pi/4)=3(1)=3

*asked on October 2, 2014* -
## english

Which synonym of the word look would be most effective in the following sentence? Detective Flint leaned forward with narrowed eyes to _______ what appeared to be a vital clue. A. survey B. scrutinize C. view D. ogle I think it's B.

*asked on March 21, 2014* -
## Math

a restaurant charges a reservation fee of $15 for its party room, plus $21.50 per person. If the bill was $445, how many people were at the party? HELP PLEASE! IS THE ANSWER 30?

*asked on December 14, 2013* -
## chemistry

2. What is the percent yield of Mg3N2 if 73.9 g of Mg reacts with 31.6 g of N2 to produce 79 g of Mg3N2 according to the following chemical reaction? (Reaction may or may not be balanced.) mg+n2=Mg3N2

*asked on November 26, 2013* -
## chemistry

n an experiment, Ann mixes concentrated sulfuric acid with water in a reaction test tube. The walls of the test tube turn hot. What type of reaction has occurred?

*asked on October 21, 2013* -
## geometry

For 1 through 10, what is the area and volume of the given shape, if the length of one side of the base is 6, the height is 8, and the slant height is 10? (Not all shapes will require all three numbers.) The shape is a right prism with: 1. an equilateral

*asked on September 23, 2013* -
## English

If someone speaks candidly, she is most likely speaking ; ~honestly ~quietly ~sarcastically

*asked on August 28, 2013* -
## Physics

A pinhole camera has a small circular aperture of diameter D. Light from distant objects passes through the aperture into an otherwise dark box, falling on a screen at the other end of the box. The aperture in a pinhole camera has diameter D = 0.600 mm.

*asked on June 2, 2013* -
## Math

A basketball star earned $2,000,000 last year. He played in 64 games for an average of 42 minutes per game. Find these rates dollars per game dollars per minute of playing time

*asked on February 14, 2013* -
## Math

Mr. quark drove his car 314 miles in 6.5 hours. He used 12.7 gallons of gas. Find these rates. gallons per mile

*asked on February 14, 2013* -
## Math

Mr. quark drove his car 314 miles in 6.5 hours. He used 12.7 gallons of gas. Find these rates

*asked on February 14, 2013* -
## Physics

If a 60 kg meteor falls to earth from a great distance. How much gravitational potential energy does it lose? (the energy PE is 0 at a great distance). What happens to this potential energy? Final-Initial=-Gmm/r-0=change in energy

*asked on January 31, 2013* -
## Physics

An object is placed 8 cm in front of a convex lens of focal length 6 cm. Find the image location by drawing a ray tracing diagram to scale. Verify your answer using the lens equation.

*asked on November 23, 2012* -
## Chemistry

51.34 g of water at 81.5 oC is added to a calorimeter that contains 52.13 g of water at 40.7 oC. If the final temperature of the system is 59.4 oC, what is the calorimeter constant (Ccalorimeter) ? Use 4.184 J/goC for the heat capacity of water.

*asked on November 8, 2012* -
## Chemistry

Calculate the final temperature of a mixture of 200.0g of ice initially at -16.5 Celsius and 406.0g of water initially at 84.5 degrees Celsius.

*asked on November 8, 2012*