# sarah

Popular questions and responses by sarah
1. ## Chemistry

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

2. ## 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

3. ## 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?

4. ## 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

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.

6. ## 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

7. ## 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 =

8. ## 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.

9. ## 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.

10. ## 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

11. ## 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

12. ## 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).

31. ## 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

32. ## 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

33. ## 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

34. ## Physics

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

35. ## Trig

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

36. ## 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!!

37. ## 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

38. ## Physics

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

39. ## 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.

40. ## 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.

41. ## Social studies

Identify 5 ways of developing human resource

42. ## 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

43. ## 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

44. ## 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?

45. ## 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

46. ## Physical Science

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

47. ## 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

48. ## 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

49. ## 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

50. ## 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

51. ## 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.

52. ## 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.

53. ## Mathematics

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

54. ## 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

55. ## 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

56. ## 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?

57. ## 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?

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?

59. ## math

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

60. ## 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

61. ## science

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

62. ## Math

Round 6784 to the nearest thousand, hundred and ten

63. ## 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

64. ## 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

65. ## 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.

66. ## 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.]

67. ## 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

68. ## 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.

90. ## CALCULUS

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

91. ## 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.

92. ## 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

93. ## 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

94. ## 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?

95. ## 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?

96. ## 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

97. ## English

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

98. ## 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.