# sarah

Popular questions and responses by sarah-
## Chemistry

Identify the products formed in this Brønsted-Lowry reaction. HPO2−4+HBrO↽−−⇀acid+base Acid: Base:

*asked on July 30, 2019* -
## Calculus!!!

Find f. (Use C for the constant of the first antiderivative and D for the constant of the second antiderivative.) f ''(x) = 8 + x3 + x5

*asked on November 7, 2013* -
## History

Which battle was a major turning point for US and South Korean forces during the Korean War? a. Battle of Pork Chop Hill b. Spring Offensive c. Battle of Heartbreak Ridge d. Inchon Bay landing Is it D?

*asked on August 20, 2018* -
## History

Which accurately describe the causes of the contentious relationship between President Truman and General MacArthur? (Select all that apply.) a. Truman favored a containment policy on Communism, while MacArthur wanted to pursue the Communist forces into

*asked on August 20, 2018* -
## GEOMETRY HELP PLEASE

The bases of trapezoid $ABCD$ are $\overline{AB}$ and $\overline{CD}$. We are given that $CD = 8$, $AD = BC = 7$, and $BD = 9$. Find the area of the trapezoid.

*asked on April 23, 2016* -
## Physics

A 1000 kg car pushes a 2000 kg truck that has a dead battery. When the drive steps on the accelerator, the drive wheels of the car push against the ground with a force of 4500 N. a) What is the magnitude of the force of the car on the truck? b) what is the

*asked on June 12, 2010* -
## Physics

The engine of a motorboat delivers 30.0 kW to the propeller while the boat is moving at 15.0m/s. What would be the tension in the towline if the boat were being towed at the same speed? I know to use P=Fv and solve for F so P = 3000kN right because 1 kW =

*asked on June 22, 2009* -
## Physics

The four tires of an automobile are inflated to an absolute pressure of 2.0*10^5 Pa. Each tire has an area of 0.024m^2 in contact with the ground. Determine the weight of the automobile. Pressure*area= force. There are four tires.

*asked on May 10, 2007* -
## physics

What is the tension in the rope of this figure description? 60 kg person is hanging in the air on a rope attached to a pulley, with a 100 kg mass attached on other end that is touching the ground.

*asked on June 13, 2010* -
## Physics

2. Consider the ball example in the introduction when a ball is dropped from 3 meters. After the ball bounces, it raises to a height of 2 meters. The mass of the ball is 0.5 kg a. What is the speed of the ball right before the bounce? b. How much energy

*asked on November 5, 2015* -
## Calculus

A landscape architect wished to enclose a rectangular garden on one side by a brick wall costing $60/ft and on the other three sides by a metal fence costing $50/ft. If the area of the garden is 102 square feet, find the dimensions of the garden that

*asked on April 9, 2016* -
## Mathematics

The vertical angle of a cone is 70° and its height is 11cm. Calculate the slant height of the cone ( correct to the nearest whole number).

*asked on July 20, 2020* -
## Pre-calculus

Complete the table assuming continuously compounded interest. (Round your answers to two decimal places.) Initial Investment: Annual % Rate: Time to Double: 8 yr Amount After 10 Years: $1700 I don't understand how to get in the initial investment of annual

*asked on October 11, 2015* -
## Physics

A potter’s wheel with rotational inertia of 45 kg m2, is spinning freely at 40 rpm. The potter drops a lump of clay onto the wheel where it sticks a distance 1.2 m from the rotational axis at the wheel’s center. If the subsequent angular speed of the

*asked on June 29, 2009* -
## Physics

A bowling ball weighing 71.2 N is attached to the ceiling by a 3.80 m rope. The ball is pulled to one side and released; it then swings back and forth like a pedulum. as the rope swings through its lowest point, the speed of the bowling ball is measured at

*asked on June 15, 2009* -
## Statistics

The probability that a randomly selected individual in a certain community has made an online purchase is 0.45. Suppose that a sample of 10 people from the community is selected, what is the probability that at most 3 of them has made an online purchase?

*asked on June 2, 2013* -
## Calc.

If the Queen Bee leaves the hive and travels 210 m [N32°E] and then 37 m [S51°W], how far and in what direction is the bee from its hive? I am unsure of my final answer, can someone please explain this so I know if I am doing this right? THANKS!

*asked on July 2, 2008* -
## Physics

In the figure, a chain consisting of five links, each of mass 0.100 kg, is lifted vertically with constant acceleration of magnitude a = 2.50 m/s2. Find the magnitudes of (a) the force on link 1 from link 2, (b) the force on link 2 from link 3, (c) the

*asked on March 19, 2011* -
## Physics

A track star in the long jump goes into the jump at 12 m/s and launches herself at 20.0° above the horizontal. How long is she in the air before returning to Earth? (g = 9.81 m/s2)

*asked on October 6, 2013* -
## Economics

Questions: Are the following workers more likely to experience short-term or long-term unemployment? Explain. a. A construction worker laid off because of bad weather. b. A manufacturing worker who loses her job at a plant in an isolated area. c. A

*asked on March 24, 2007* -
## Chemistry

You have 75.0 mL of a 2.50 M solution of Na2CrO4 (aq). You also have 125 mL of a 2.15 M solution of AgNO3 (aq). Calculate the concentration of NO3 when the two solutions are added together.

*asked on August 22, 2015* -
## Physics

A grasshopper leaps into the air from the edge of a cliff at a 50 degree angle. He reaches a maximum height 6.74 cm above the top of the cliff and travels a total horizontal distance of 1.06 m. How tall is the cliff and what is the initial speed of the

*asked on June 12, 2015* -
## chemistry

A voltaic cell that uses the reaction Tl3+(aq) + 2 Cr2+(s) ¨ Tl+(aq) + 2 Cr3+(aq) has a measured standard cell potential of +1.19 V. determine E‹red for the reduction of Tl3+(aq) to Tl+(aq).

*asked on April 14, 2013* -
## Chemistry

Which one of the following liquids will have the highest freezing point? A. pure H2O B. aqueous glucose (0.050 m) C. aqueous CoI2 (0.030 m) D. aqueous FeCl3 (0.030 m) E. aqueous NaI (0.030 m) Could you please give a step by step process?

*asked on November 7, 2011* -
## biology

Which best describes Francis Bacon’s contribution to the Scientific Revolution?

*asked on February 27, 2018* -
## physics

A child is standing on a platform of a station. A train travelling at 30m/s takes 3.0 secs to pass the child.What is the length of the train. a)10m-this was my answer b)27m c)30m d)90m

*asked on November 9, 2014* -
## Chemistry

Write the balanced chemical equation for each of these reactions. Include phases. When aqueous sodium hydroxide is added to a solution containing lead(II) nitrate, a solid precipitate forms. However, when additional aqueous hydroxide is added the

*asked on May 11, 2012* -
## Civics

2. One main difference between the United States Constitution and state constitutions is that state constitutions A. are much longer. B. don't provide for a legislature. C. can't be amended. D. don't have bills of rights. So your saying it's D? (Reed)

*asked on March 29, 2015* -
## math

seven horses are entered in a race. If two horses are tied for first place, and there are no ties among the other five horses, in how many ways can the seven horses cross the finish line?

*asked on May 6, 2016* -
## Algebra

an investment of 72,000 was made by a business club. the investment was split into three parts and lasted for one year. the first part of the investment earned 8% interest. the second 6% and the third 9%. total interest from the investments was $5640. the

*asked on March 9, 2011* -
## physics

It is possible to shoot an arrow at a speed as high as 100 m/s. (a) If friction is neglected, how high would an arrow launched at this speed rise if shot straight up? (b) How long would the arrow be in the air? Please help! I do not have any clue as to how

*asked on June 7, 2010* -
## Literature

What are some of the poetic devices used in this poem by Gladys Cardiff? -diction -end-stopped -lyric -symbol -syntax Bending, I bow my head And lay my hand upon Her hair, combing, and think How women do this for Each other. My daughter's hair Curls

*asked on January 12, 2011* -
## math

In a certain town, 25% of people commute to work by bicycle. If a person is selected randomly from the town, what are the odds against selecting someone who commutes by bibycle? A). 3:1 B). 3:4 C). 1:3 D). 4:1

*asked on September 18, 2010* -
## Physics

What forces act on the puck as it skids across the ice

*asked on July 20, 2020* -
## Trig

Cosine theta=8/17 and 270 degrees is < theta, and theta is< 360

*asked on September 28, 2016* -
## Calculus

If tanh(x)=24/25, find the values of the other hyperbolic function at x I was able to find coth(x)=25/24, but what is sin, cos, csc, and sec? I would greatly appreciate your help!!

*asked on May 24, 2010* -
## History

Which identifies points of the agreement between the Soviet Union and the other Allied powers at the Yalta Conference? Select all that apply. the establishment of a communist regime over Germany the division of Germany into four Allied occupation zones the

*asked on July 14, 2020* -
## Physics

The speed of sound in steel is 5000 m/s. What is the wavelength of the sound wave of 640 Hz in steel?

*asked on June 29, 2009* -
## college physics

three carts of masses 4.0kg, 10kg, and 3.0kg move on a frictionless horizontal track with speeds of 5.0m/s, 3.0m/s, and 4.0m/s. The carts stick together after colliding. find the velocity of the three carts.

*asked on June 1, 2008* -
## chemistry

draw the skeletal structure line-angle (line-bond) mode of 2-isopropyltoluene. Identify the number of hydrogen atoms bound to each carbon in the structure.

*asked on October 13, 2016* -
## Social studies

Identify 5 ways of developing human resource

*asked on July 17, 2020* -
## Mathematics

A closed tin of milk has diameter 10cm and height 16cm find the total surface area of the tin( take pie to be 22/7

*asked on June 18, 2020* -
## PHYSICS

A 200g block slides back and forth on a frictionless surface between two springs, as shown. The left-hand spring has k = 130 N/m and its maximum compression is 16cm. The right-hand spring has k = 280 N/m. Find (a) the maximum compression of the right-hand

*asked on February 12, 2014* -
## Partial Pressure- Chemistry

A gaseous mixture of O2 and N2 contains 31.8 % nitrogen by mass. What is the partial pressure of oxygen in the mixture if the total pressure is 445 mmHg?

*asked on September 23, 2008* -
## I need HELP bad! Macroeconomics!

1). Kelly purchased ten shares of Gentech stock for $200 in year 1 and sold all the shares in year 2 for $220 a share. Between year 1 and year 2, the price level increased by 5%. The tax on capital gains is 50%. If the capital gains tax is on nominal

*asked on May 20, 2008* -
## Physical Science

If a skydiver has a mass of 125 Kg, what is his weight on Earth?

*asked on July 21, 2020* -
## Math

A basketball is tossed from the top of a 3m wall. The path of the basketball is defined by the relation y=-x^2+2x+3 where x represent the horizontal distance travelled, in metres, and y represents the height, in metres, above the ground. A) How far has the

*asked on October 8, 2017* -
## Algebra

A chemist wishes to mix a solution that is 4% acid. She has on hand 66 liters of a 2% acid solution and wishes to add some 8% acid solution to obtain the desired 4% acid solution. How much 8% acid solution should she add? There is a chart

*asked on May 22, 2016* -
## Calculus

The monthly demand function for a product sold by a monopoly is p = 3750 − 1/3x^2 dollars, and the average cost is C = 1000 + 70x + 3x^2 dollars. Production is limited to 1000 units and x is in hundreds of units. (a) Find the quantity that will give

*asked on March 25, 2013* -
## physics help

At a certain location, the solar power per unit area reaching the Earth's surface is 180 W/m2 averaged over a 24-hour day. Suppose you live in a solar powered house whose average power requirement is 3.2 kW. At what rate must solar energy reach your solar

*asked on March 27, 2011* -
## Chemistry

Electromagnetic radiation with a wavelength of 665 nm appears as orange light to the human eye. The energy of one photon of this light is __________ J.

*asked on October 26, 2010* -
## math

A storage tank has a radius of x + 5 metres and a height of x metres. Determine the dimensions of the tank if the volume is 192ð m3? . Round your answers to two decimal places.

*asked on February 13, 2014* -
## Mathematics

Solve the equation (3x- 2)/8 = (8+5x)/2.

*asked on July 22, 2020* -
## english

Which of the following is the best definition of a drama? a. a story with props b. a story with a happy ending c. a story written to be preformed by actors d. a story in which the main character eventually fails I think it's D, can anyone check me? Thanks

*asked on April 11, 2015* -
## Civics

6. If both the president and the vice president are unable to fulfill their duties, who takes over as president? A. President pro tempore of the Senate B. Attorney general C. Speaker of the House D. Secretary of state "In the case that the president can no

*asked on April 3, 2015* -
## chem

3 Ce4+(aq) + Cr(s) ¨ 3 Ce3+(aq) + Cr3+(aq) What is the emf of this cell when [Ce4+] = 2.9 M, [Ce3+] = 0.11 M, and [Cr3+] = 0.015 M?

*asked on April 16, 2013* -
## math

A recipe that makes 18 cookies calls for 3/4 cup of sugar. How much sugar is needed to make 24 cookies using this recipe?

*asked on March 3, 2011* -
## AP Physics PLEASE HELP DUE TOMORROW

Consider the freight train. Suppose 15 boxcars pass by in a time of 14.0 s and each has a length of 14.0 m. (a) What is the frequency at which each boxcar passes? (b) What is the speed of the train?

*asked on February 8, 2011* -
## math

Convert the base-ten number to a numeral in the indicated base. 329 to base six

*asked on July 20, 2009* -
## Physics

A giant swing at a county fair consists of a vertical central shaft with a number of horizontal arms attahed at its upper end. Each arm supports a seat suspended from a 5.00 m long rod, the upper end of which is fastened to the arm at a point 3.00 m from

*asked on June 15, 2009* -
## science

How many neutrons does the most common isotope of carbon contain? Use the diagram below to help you.

*asked on July 6, 2020* -
## Math

Round 6784 to the nearest thousand, hundred and ten

*asked on October 8, 2017* -
## Calculus

I am re-posting this question because i wrote the incorrect function last time. An oil tank is being drained for cleaning. After t minutes there are v litres of oil left in the tank, where v(t)=35(25-t)^2, 0

*asked on April 9, 2014* -
## World Geography

Imagine you are an elected official with the responsibility of drafting legislation designed to protect our environment. What items will you include in your bill? Who will be responsible for the bill's implementation? Its enforcement? Your response should

*asked on March 6, 2014* -
## probability

For a family with 2 children, the sample space indicating boy (B) or girl (G) is BB, BG, GB, and GG. If each of the outcomes is equally likely, find the probability that the family has 2 girls, given that the first child is a girl.

*asked on July 6, 2013* -
## chemistry

Calculate the concentration of oxalate ion (C2O42−) in a 0.175 M solution of oxalic acid (C2H2O4). [For oxalic acid, Ka1 = 6.5 × 10−2, Ka2 = 6.1 × 10-5.]

*asked on February 22, 2011* -
## Physics

a model of a helicopter rotor has four blades, each 3.40 m in length from the central shaft to the tip of the blade. The model is rotated in a wind tunnel at 550 rev/min. A) what is the linear speed, in m/s of the blade tip? B.) what is the radial

*asked on June 7, 2009* -
## math

Nicholas is the facilities manager for Green Market Groceries. The store is remodeling and wants to determine which brand of freezer to use for its frozen goods section. The freezers vary by size, cabinet type, accessibility, refrigerant, and interliner.

*asked on January 17, 2020* -
## Math

2. The cost of producing x units of a certain commodity is given by Px 1000 0 x MCsds, where P is in dollars and Mx is marginal cost in dollars per unit. A. Suppose the marginal cost at a production level of 500 units is $10 per unit, and the cost

*asked on September 1, 2019* -
## Civics

1. Suppose Bill HR612 is currently in Congress. One thing you know about this bill is that it A. originated in the House of Representatives. B. has been vetoed by the president. C. has no riders attached. D. is currently in committee. A?

*asked on March 29, 2015* -
## Math

Consider the function y = 3x5 – 25x3 + 60x + 1. Find the critical points of this function. So I got 1 and 2 as the critical points..but I feel like I did something wrong, is this right?

*asked on December 9, 2014* -
## statistics

The grades on the final examination given in a large organic chemistry class are normally distributed with a mean of 72 and a standard deviation of 8. The instructor of this class wants to assign an “A” grade to the top 10% of the scores, a “B”

*asked on March 24, 2013* -
## MSU

aluminum sulfate and sodium phosphate Express your answer as chemical equation.

*asked on October 6, 2011* -
## Math

Assume the carrying capacity of the earth is 9 billion. Use the 1960s peak annual growth rate of 2.1% and population of 3 billion to predict the base growth rate and current growth rate with a logistic model. Assume a current population of 6.8 billion.

*asked on March 26, 2017* -
## Calc.

Please help solve this, A farmer has 600m of fence and wants to enclose a rectangular field beside a river. Determine the dimensions of the fence field in which the maximum area is enclosed. (Fencing s required on only three sides: those that aren't next

*asked on March 2, 2010* -
## Chemistry

Commercial vinegar was titrated with NaOH solution to determine the content of acetic acid, HC2H3O2. For 20.0 milliliters of the vinegar 26.7 milliliters of 0.600-molar NaOH solution was required. What was the concentration of acetic acid in the vinegar if

*asked on May 23, 2007* -
## Calculus

Consider the curve given by x^ 2 +sin(xy)+3y^ 2 =C, where Cis a constant. The point (1, 1) lies on this curve. Use the tangent line approximation to approximate the y-coordinate when x = 1.01 .

*asked on January 17, 2020* -
## Career Explorations

PLEASE CHECK MY ANSWERS! 1. What previous work experience would a fire inspector be expected to have? A. police officer B. security guard C. fire fighter D. chemist ** 2. Which of the following is an example of a career in public safety? A. attorney B.

*asked on March 7, 2019* -
## Calc

If y=tanu, u=v-(1/v), and v=lnx. What is the value of dy/dx at x=e?

*asked on December 6, 2016* -
## AP Calculus

Find all points on the graph of f(x)=-x^3+3x^2-2 where there is a horizontal tangent line.

*asked on November 30, 2014* -
## Biology

Is 9th grade biology hard? Is it interesting...?? I love life science but I just wondering if 9th grade biology hard??? I'm taking biology next year.

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

What is the value of q when 8.21g of water vaporizes at 373 K? The enthalpy of condensation of water at 373 K is -40.7 kJ/mol. I tried using the equation q= m x Cs x Delta T, but I never got the right answer which is 18.5 kJ apparently, so I need to find

*asked on February 4, 2013* -
## physics

If a 80 lightbulb emits 4.0 of the input energy as visible light (average wavelength 550 ) uniformly in all directions, estimate how many photons per second of visible light will strike the pupil (4.0 diameter) of the eye of an observer 3.0 away. 1. I

*asked on April 16, 2012* -
## physics

A certain orthodontist uses a wire brace to align a patient's crooked tooth as in the figure below. The tension in the wire is adjusted to have a magnitude of 21.12 N. Find the magnitude of the net force exerted by the wire on the crooked tooth.

*asked on October 5, 2011* -
## science

the velocity of a particle is given by v=[16t^2i+4t^3j +(5t+2)k]m/s, where t is in seconds. If the particle is at the origin when t=0, determine the magnitude of the particle's acceleration when t=2s. What is the x,y,z coordinate position of the particle

*asked on November 3, 2008* -
## Chem

Consider the following balanced equation: 2N2H4(g)+N2O4(g)→3N2(g)+4H2O(g) Complete the following table showing the appropriate number of moles of reactants and products. If the number of moles of a reactant is provided, fill in the required amount of the

*asked on April 27, 2016* -
## Math

All rational functions can be expressed as f(x) = p(x)/q(x), where p and q are __________ functions and q(x) ≠ 0. A. horizontal asymptotes B. polynomial C. vertical asymptotes D. slant asymptotes Is the answer D. vertical asymptotes?

*asked on October 19, 2014* -
## Math(problem solving)

Four darts are thrown at this dartboard. If all four darts hit the board, how many different point totals are possible? there are 4 circles with point totals: working out from the middle bulls eye.. bulls eye = 9 2nd circle = 7 3rd circle = 4 outter circle

*asked on March 6, 2013* -
## microeconomics

1. Market demand is given as QD = 250 – 0.5P. Market supply is given as QS = 2P. In a perfectly competitive equilibrium, what will be the value of consumer surplus? a.$10 000 b.$20 000 c.$40 000 d.$80 000 2. Market demand is given as QD = 250 – 0.5P.

*asked on February 13, 2013* -
## CALCULUS

The linearization at a=0 to sqrt(6+6x) is A+Bx where A is:_____ and where B is:_____

*asked on May 19, 2012* -
## Chemistry

The reaction of aqueous sodium bromide and aqueous lead(II) nitrate is represented by the balanced net ionic equation. 2Br-(aq) + Pb2+(aq) → PbBr2(s) Give the balanced ionic equation for the reaction. Include the states.

*asked on January 29, 2010* -
## Physics

A markman fires a .22 caliber rifle horizontally at a target the bullet has a muzzle velocity with magnitude 750 ft/s. How much does the bullet drop in flight if the target is (a) 50.0 yd away and (b) 150.0 yd away? for this question i was given the

*asked on June 7, 2009* -
## Calculus

The altitude of a kite is graphed here (the y-axis is in increments of 10 feet; the t-axis is in minutes). Over which intervals is the kite accelerating upward? paste.pics/1a51dc876019fc4dd47240a035d8f5bf Go to this website for the graph

*asked on January 17, 2020* -
## Personal Finance

If overall interest rates in the economy rise, a corporate bond with a fixed interest rate will generally: A. increase in value. B. decrease in value. C. remain unchanged. D. become worthless. B?

*asked on April 15, 2016* -
## Math

the amount (in milligrams) of a drug in the body t hours after taking a pill is given by A(t)=30(0.8)t . (a) What is the initial dose given? (b) What percent of the drug leaves the body each hour? Percent: (c) What is the amount of drug left after 9 hours?

*asked on February 14, 2016* -
## Civics to Ms.Sue

3. Which one of the following statements is accurate for the Articles of Confederation? A. There was only one central court. B. Each state could veto a presidential decision. C. There was no president. D. Interstate commerce could be regulated. My sister

*asked on March 27, 2015* -
## English

1. Which kind of adjective is used most frequently in ordinary speech or writing? A. Demonstrative B. Article C. Proper D. Common B?

*asked on November 11, 2014* -
## Math Help!!

3. Which one of the following pairs of numbers contains like fractions? A. 6/7 and 60/70 B. 1/2 and 3/2 C. 4/8 and 12/16 D. 5/4 and 4/5 17. Which of the following pairs of numbers contain like fractions? A. 5/6 and 10/12 B. 6/7 and 15/7 C. 3/2 and 2/3 D.

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

6. Which of the following sentences contains an abstract noun? A. They did a good job planning the party. B. Respect must be earned. C. She thought we should have left earlier. D. I hope that we are not late.

*asked on September 25, 2014* -
## Chemistry

A 3.80 L cylinder contains 6.83g of methane, CH4, at a pressure of 3320 mmHg. What is the temperature of the gas? I know you use the formula PV= nRT, but I can't seem to get two sides equal each other, thus having the wrong temp. My guess is that I have to

*asked on November 14, 2012*