# p

Most popular questions and responses by p
1. ## Chemistry

2C(s)+H2(g)+227.4kJ -> C2H2(g) is an endothermic reaction. If 682.2 kilojoules are absorbed, how many moles of C2H2(g) are produced?

2. ## Social Studies

President George H. Bush was able to convince U.N. forces to invade Iraq in a military effort known as "Operation Desert Storm" because nations feared A) Iraq's leader Saddam Hussein planned to invade Saudi Arabia next, which was an important U.S. ally. B)

3. ## ELA

Paired Passages: Sympathy, and An Account of an Experience with Discrimination Paul Laurence Dunbar and Sojourner Truth Sympathy by Paul Laurence Dunbar I KNOW what the caged bird feels, alas! When the sun is bright on the upland slopes; When the wind

4. ## ELA

Which description is accurate and true of all three sentences? 1. We struggled to understand the complicated algebraic expressions. 2. We could not wait to hear our grades on the final exam. 3. We failed to demonstrate our knowledge and understanding. A)

5. ## Physics

Three charges (q1=1 μC, q2=−2 μC, q3=3 μC) are located at the corners of an equilateral triangle with sides of length one meter. The 3 μC charge is: Repelled by q1 and attracted by q2. Attracted by q1 and repelled by q2. Attracted by both q1 and q2.

6. ## Language Arts

Hello. I have an essay question I would like help with. I already wrote it, but I don't feel too sure about it. Please critique it. The question is: The title “Two Kinds” refers to the statement by Jing-mei’s mother that there are only two kinds of

7. ## math

Jenny must sit four papers for an exam. The mean of the first three papers Jenny has sat is 72%. (a)If she wants to get an overall mean of at least 75%,what is the lowest mark she can get in her fourth paper? (b) What is the highest possible mean she can

8. ## Pre-Calculus

Carmen rides her bicycle at a constant rate to the market. When she rides her bicycle back home along the same route, she bikes at three-quarters the rate she biked to the market. At any given time, t, the distance biked can be calculated using the formula

9. ## Math

Stewart has \$26 dollars. He spent \$12.81, including tax, to buy a new DVD. He needs to set aside \$10.00 to pay for his lunch next week. If peanuts cost \$0.42 per package including tax, describe the maximum number of packages that Stewart can buy? A) p ≤

10. ## ss HELP ASAP!!!

What conditions most directly resulted from the Imperial Crisis? Select all that apply. A. adoption of Christianity as official religion B. devaluation of money and high inflation C. increase in taxes and greater disparity D. ongoing civil wars E.

11. ## Chemistry

A student observed the following reaction: AlCl3(aq)+3NaOH(aq) -> Al(OH)3(s)+3NaCl(aq) After the products were filtered, which substances remained on the filter paper and why?

12. ## ELA

100% - The Story of a Patriot Upton Sinclair 1 A young man is walking down the street, quite casually, with an empty mind and no set purpose; he comes to a crossing, and for no reason that he could tell he takes the right hand turn instead of the left; and

13. ## Physics

A solid ball of mass 2 kg, rolls down a hill that is 6 meters high.  What is the rotational KE at the bottom of the hill?

14. ## chemistry

For the reaction: 2SO2(g) + O2(g) = 2SO3(g) conducted at 25°C and 1 atm. Calculate H°, S°, G°

15. ## Physics

Two point charges attract each other with an electric force of magnitude F. If one charge is reduced to 1/3 its original value and the distance between the charges is doubled, what is the resulting magnitude of the electric force between them?

16. ## probability theory

Let X, Y, Z, be independent discrete random variables. Let A= X(Y+Z) and B= XY With A, B, X, defined as before, determine wheter the folllowing statements are true or false. 1. A and B are independent 2. A and B are conditionally independent, given X = 0.

17. ## chemistry

how many kg of chalcopyrite is needed to obtain 500g of pure copper

18. ## trg

A plane flies in a direction of N70°E for 80 km and then on a bearing of S10°W for 150 km. a How far is the plane from its starting point? b What direction is the plane from its starting point?

19. ## Algebra

Can someone help me factor: 4u^3+3u^2-9u+2 I don’t understand how to factor 4 terms problems.

20. ## Physics

A certain coaxial cable consists of a copper wire, radius a , surrounded by a concentric copper tube of inner radius c . The space between is partially filled (from b out to c ) with material of dielectric constant K. The goal of this problem is to find

21. ## Java Programming

I'm a beginner to Java and I need to know how to do the following: Write a program that will ask the user to enter the amount of a purchase. The program should then compute the state and county sales tax. Assume the state sales tax is 4 percent and the

22. ## Physics

A child swings a sling with a rock of mass 3.8 kg, in a radius of 0.7. From rest to an angular velocity of 8 rad/s. What is the rotational kinetic energy of the rock?

23. ## Calc

Recall that the average velocity between times t1and t2 is calculated using vave = y(t2) − y(t1)/t2 − t1. We are given that y = 14t − 1.86t^2. Evaluating at t = 1, we have y(1) = 14(1) − 1.86(1)2 = 12.14. Thus, the average velocity between times 1

24. ## Science

Compounds with high melting points have ___ a. Covalent bonds b. Metallic Bonds c. Ionic bonds*** d. No chemical bonds How could you determine if a sample of gold is pure? Compare the sample's density with that of pure gold.*** Compare the sample's color

25. ## Chemisrty

A mineral sample is analyzed for its cobalt and calcium content. A sample is dissolved, and then the cobalt and calcium are precipitated as Co(OH)2(s) and Ca(OH)2(s). At what pH can Co(OH)2(s) be separated from Ca(OH)2(s) at 25 °C? Assume that an

26. ## Math

A minor league baseball team plays 78 games in a season. If the team won 15 more than twice as many games as they​ lost, how many wins and losses did the team​ have?

27. ## Physics

The surface of the Sun is approximately 5700 K and the temperature of the Earth's surface is about 290 K. What total entropy change occurs when 1000 J of heat of energy is transferred from the Sun to the Earth?

Steamatic of Kansas City Inc specialized in cleaning and restoring property damaged by fire, smoke, water, or other elements. It employed Rhea as a marketing rep. His duties included soliciting customers, preparing cost estimates, supervising restoration

29. ## math

suppose you roll 2 number cubes. what is the probability that the product of the numbers is a multiple of 7

30. ## Physics

Two electrons are separated by 1 meter. What is the ratio of the magnitude of the electric force on one electron and the gravitational force on that electron due to the other electron? The charge of an electron is 1.6×10−19C and its mass is

31. ## math

Vanessa typically works 8 hours per day in a normal 5 day work week. Last week, however, Vanessa had to take 90 minutes off on Tuesday, 45 minutes off on Thursday, and she left two and a half hours early on Friday. How many hours did Vanessa work last

32. ## Physics

Point charges Q1 ,Q2 , and Q3 reside on three corners of a square with sides of 1m ; the distance from Q2 to P3 is 2m (see diagram). (a) What is the electric potential,V , at P1 ? (Normalize the potential to be zero at infinity and give your answers in

33. ## Physics

A flat thin non-conducting ring has an inner radius R1 and an outer radius R2 . The disk is uniformly charged with charge per unit area σ(>0) . (a) What is the electric field at the center, P , of the ring? Express your answer in terms of the following

34. ## Physics

A 64.4-kg skateboarder starts out with a speed of 2.11 m/s. He does 81.6 J of work on himself by pushing with his feet against the ground. In addition, friction does -289 J of work on him. In both cases, the forces doing the work are non-conservative. The

35. ## Chemistry

How much corn syrup should be added to water to make 200 ml of a 10% by volume solution?

36. ## physics

A car is initially travelling at 30 m/s, which is above the speed limit. The driver sees a speed limit trap ahead and applies the brakes for 5 seconds, causing the car to slow down by 2m/s every second while the brakes are on. –How far does a car travel

37. ## math

1. Best Rentals charges a daily fee plus a mileage fee for renting its cars. Barney was charged \$123.00 for 3 days and 300 miles, while Mary was charged \$216.00 for 5 days and 600 miles. What does Best Rental charge per day, for mileage?

38. ## Physics

A non-conducting ring of radius with a uniform charge density and a total charge is lying in the - plane, as shown in the figure below. Consider a point P, located at a distance from the center of the ring along its axis of symmetry. (a) What is the

39. ## Physics

A Hospital patient has injured her leg, how much mass must be used to keep her leg stationary.  The leg has a mass of 2.6 kg and is 0.87 meters in length, the rope for the tension mass  is connected at 0.65 meters from the knee.

40. ## algebra

solve for g1: F = kg1g2/r2

41. ## Math

a photocopy store advertises the following prices: 5 cents per copy for the first 20 copies, 4 cents per copy for the 21st through 100th copy, and 3 cents per copy after the 100th copy. Let x be the # of copies, and let y = the total cost of the

42. ## Physics

3 equal charges (all +Q) are located at A, B and C. ABC is an equilateral triangle with sides d. Point A is located at (0,0), point B at (d,0), point C at (d/2,d3√/2). Point P is inside the triangle such that AP=BP=CP. What is the electric field at P -

43. ## Physics

A car of mass 1060 kg is on an icy driveway inclined at an angle of 39◦ . The acceleration of gravity is 9.8 m/s 2 . θ If the incline is frictionless, what is the acceleration of the car? Answer in units of m/s 2

44. ## Physics

Three parallel plate capacitors (C1,C2 and C3 ) are in series with a battery of 100 V. C1=2500 micro Farad; C2=2C1 , C3=3C1 . (a) What is the potential difference over each capacitor and how much charge is on each capacitor? Across C1 :V1 (in Volts) =

45. ## Physics

3 equal charges (all +Q) are located at A, B and C. ABC is an equilateral triangle with sides d. Point A is located at (0,0), point B at (d,0), point C at (d/2,d3√/2). Point P is inside the triangle such that AP=BP=CP. What is the electric field at P -

46. ## Biology

How is it a solution of 300mOsM NaCl is both isotonic and isosmotic to a red blood cell with an osmolarity of 300mOsM? Yet a solution of 300mOsM urea is only isosmotic to that red blood cell?

47. ## physics

A student in a lab exerts a 14 N force to pull a block a distance of 63 cm. If a total of 8 J of work is done, the angle between the force and the displacement is none of the above 89° 25° 61° 65°

48. ## physics

You push a skateboard so that it rolls down the road at a speed of 1.40 m/s. You run after the skateboard at a speed of 3.80 m/s and while still behind the skateboard you jump off the ground at an angle of 30.0° above the horizontal hoping to land on the

49. ## Physics

A capacitor consists of two concentric spherical shells. The outer radius of the inner shell is a=0.43 mm and the inner radius of the outer shell is b=2.2 mm . (a) What is the capacitance C of this capacitor? Express your answer in Farads. incorrect (b)

50. ## math115

find the first and third quartile in the set of numbers 3,4,8,8,8,11,13,14,15,18 is it q1=3 and q3 = 18

51. ## Physics

Two spherical conductors, A and B , are placed in vacuum. A has a radius rA=25cm and B of rB=35cm. The distance between the centers of the two spheres is d=225 cm. A has a potential of VA =120 Volt and B has a potential of VB = -40 Volt. a. An electron is

52. ## COM 220

I am needing to write an outline on Immigration in the United States. Here is my thesis " While immigration has positive results to the U.S., illegal immigration laws must be enforced to reduce the negative impavt of costs and the admittance of legal

53. ## math115

(-3)(-6) + (4)(-2)=10 (-3)to third power-  (-8)(-2)=-43 (-6)to second power-  4 to the second power=-20 -9to second power-  (-6)second power=117

54. ## math

Many people are interested in losing weight through exercise. An important fact to consider is that a person needs to burn off 3,500 calories more than he or she takes in to lose 1 pound, according to the American Dietetic Association. The following table

55. ## math

Jon spent 1/3 of his study time doing math homework and 2/7 preparing fo a history exam what fraction of study time remains?=2/21

56. ## Science

The human stomach is an organ that helps us digest food. The stomach is one of many organs involved in the process of digestion. Others include the esophagus, small intestine, pancreas, and gall bladder. What name is given to a set of organs that work

57. ## algebra

Solve the system by graphing. (If the system is inconsistent, enter INCONSISTENT. If the system is dependent, enter DEPENDENT.) 4x + 2y = 12 5x − 4y = 2

58. ## Physics

A circuit consists of 5 resistors and 3 batteries (see diagram); the connecting wires have all a negligible resistance. The values for R1 , R2 , R3 , R4 , and R5 are 14 Ω, 41 Ω, 68 Ω, 83 Ω, and 110 Ωrespectively. The batteries have a negligible

59. ## Physics

A point-like negatively charged particle of mass m and charge -q is initially released from rest from the point P along the positive z-axis where the magnitude of the electric field is largest. (a) What is the distance from the point P to the origin?

60. ## Physics

There are two conducting concentric hollow spheres of outer radii and ( ). The thickness of the material of both spheres is . The inner sphere is negatively charged with charge density . The larger sphere is positively charged with charge density . (a)

61. ## Physivs

A flat thin non-conducting ring has an inner radius and an outer radius . The disk is uniformly charged with charge per unit area . (a) What is the electric field at the center, , of the ring? Express your answer in terms of the following variables, if

62. ## math

Solve graphically y = 2x - 6 and y = -2x + 10

63. ## MATH

Many people are interested in losing weight through exercise. An important fact to consider is that a person needs to burn off 3,500 calories more than he or she takes in to lose 1 pound, according to the American Dietetic Association. The following table

64. ## angel

Lula wants to round 76.24491 to the nearest hundredth. She first rounds 76.24491 to 76.245 and then rounds 76.245 to 76.25 and claims that this is the final answer. What is wrong with this approach?

65. ## Physics

Three infinite uniformly charged thin sheets are shown in the figure below. The sheet on the left at x=-d is charged with charge per unit area of -3σ , The sheet in the middle at x=0 is charged with charge per unit area of +σ , and the sheet on the right

66. ## math

4. Solve the system of equations x + y = 6 x - y = -9

67. ## math

Solve the system of equations x + 3y = 32 -3x + 2y = 3

68. ## Chemistry

A 0.5962g sample of iron ore is dissloved in acid producing Fe3+. Though a series of reactions, the iron precipitates as the Fe(OH)3. The precipitates is heated, forming solid Fe2O3. What is the mass % of iron in the sample if the analysis produced 0.3210g

69. ## math calculus

how to calculate dy/dx for the curve y=x^(ln x)^2

70. ## MATH 115

I have math questions I need to check my answers can you please help me 1. 4x4x4x4x4 as a power of 4 answer 4 to the fifth power 2.a bedroom is 10 ft by 11 ft what is the perimeter? answer 42 ft evaluate 72/8-9/3=6 3.Jamal is fencing a rectangular field

71. ## PUBLİC LAW, Political science, ir

You are a Spanish conquistador who just took control of a large territory in Americas in medieval time. Which political concept requires you that you should obey the orders of the Spanish King and not to administrate the land on your own??(this question is

72. ## trg

An earth embankment is 27 m long and has a cross-section shown in the diagram. Find the volume of earth needed to build the embankment.

73. ## Physics

A circuit is composed of a capacitor C= 3 micro F, two resistors both with resistance 69 Ohm, an inductor 6.00e-2 H, a switch , and a battery 25 V. The internal resistance of the battery can be ignored . Reminder: The " L=x.xxenn H" notation means " L=x.xx

74. ## Physics

There is a very large horizontal conducting plate in the plane (consider it infinitely large). Its thickness is . The charge densities on the upper and the lower surfaces are both equal to . The goal of this problem is to find the electric field (magnitude

75. ## physics

a ball is thrown vertically upward from the top of the building with a velocity 10m/s.it reaches the ground in 5 sec.Find the height of the building the ball strikes the ground?

76. ## Math

I have to use my answer from a previous question (factorise and solve x^2+x-30=0 which i factorised as (x-5)(x+6)=0 and then solved as x=5 or x=-6) i now have to explain how i can use this answer to solve th equation 4x^2+4x-120=0 and then say what are the

77. ## statistics

The flower peddler has red flowers with five petals each and white flowers with eight petals each. He has a total of 11 flowers with a total of 76 petals. How many red flowers are there and how many white flowers?

78. ## math

please check my answers 1. the ratio of 5 3/5 to 2 1/10=8to 3 2.the ratio of 7 dimes to 3 quarters =14 to 15 3.Marc took 3 hours (h) to mow a lawn while Angelina took 150 minutes (min) to mow the same lawn a week earlier. Write the ratio of Marc’s time

79. ## math

There is a rectangular piece of land that measures 40ft by 70 ft in the middle there is a square sandbox that is 6 ft on each side the rest of the land is covered in grass what percent of the land is covered by grass rounded to the nearest tenth of a

80. ## math

lcm of 150,36,245 =44100 ?

81. ## math

1. kristi jogged for 3/5 of an hr,swam 1/2 of an hr, rode her bike 3/4 of an hr how long did she exercise?=1 7/20 2.the intersest rate on an equity line of credit was 7 7/8% last month this month the interset rate is 10 3/2% how many percentage points has

82. ## math

There is a rectangular piece of land that measures 40ft by 70 ft in the middle there is a square sandbox that is 6 ft on each side the rest of the land is covered in grass what percent of the land is covered by grass rounded to the nearest tenth of a

83. ## math

please check my answers 1.Write each of the following as a common fraction or mixed number.4.0171=. 4 171/10,000 2.Arrange in order from smallest to largest.2.05,25/10 , 2.0513, 2.059,251/100 , 2.0515, 2.052, 2.051 3. 27.4  213.321  39.38 add=280.101

84. ## math

can you please check my answers? 12, 20, and 35 LCM =420 1/3+5/12+4+5=60 LCD 13/15-11/20=19/60 What is the combined price for a 1/2-in. sheet and a 5/8-in. sheet? 1/2PRICE \$17.88 5/8 PRICE\$19.13 =37.01 1 1/15+3 3/10-2 4/5=1 17/30 5 1/3+2 1/4+3 1/2=11 1/12

85. ## math

Company A rents copiers for a monthly charge of \$200 and \$0.08 per copy. Company B rent copiers for a monthly charge of \$400 and \$0.04 per copy. How many copies produce the same bill? The answer I have is 5,0000 is this correct? Thanks

86. ## Physics

The electric and magnetic fields of a plane electromagnetic wave are given by the formulas below, where and are both in meters and is in seconds. This wave is traveling through a medium whose index of refraction is 1.3. Reminder: The "x.xxenn t" notation

87. ## Physics

An electron is projected, with an initial speed of vi=2.06e+05 m/sec, directly towards a proton that is essentially at rest. If the electron is initially a great distance from the proton, at what distance from the proton is its speed instantaneously equal

88. ## Physics

Two conducting thin hollow cylinders are co-aligned. The inner cylinder has a radius R1 , the outer has a radius R2 . Calculate the electric potential difference V(R2)-V(R1) between the two cylinders. The inner cylinder has a surface charge density of

89. ## Physics

There is a very large horizontal conducting plate in the x-y plane (consider it infinitely large). Its thickness is h . The charge densities on the upper and the lower surfaces are both equal to +σ. The goal of this problem is to find the electric field

90. ## Physics

There are two conducting concentric hollow spheres of outer radii R2 and R1 ( R2>R1 ). The thickness of the material of both spheres is d . The inner sphere is negatively charged with charge density -σ1, . The larger sphere is positively charged with

91. ## chemistryy

A photon interacts with a ground state electron in a hydrogen atom and is absorbed. The electron is ejected from the atom and exhibits a de Broglie wavelength of 4.548 x 10^-10m. Determine the frequency (in hz) of the interacting photon. i got

92. ## chemistry

I need help building a 3d model of the apertame molecule Can you give me the correct angles? Thanks

93. ## geometry

The triangle DEF has vertices D(-1,3) E(7,1) and F(4,6). Classify the triangle as: a) isosceles or scalene b) right angled or not

94. ## Math

does y=11-x ,for x makje x=y+11? -8-14=6 7.4=x-13 answer 6.1 m/m for m =72 and n =9 m/n=72/9=8 -4x+7=39 4x/4x=32/4x 4/32=x8 -10 is greater than -18 -4*(-9)= 36

95. ## algebra

does y=11-x ,for x makje x=y+11? -8-14=6 7.4=x-13 answer 6.1 m/m for m =72 and n =9 m/n=72/9=8 -4x+7=39 4x/4x=32/4x 4/32=x8 -10 is greater than -18 -4*(-9)= 36

96. ## Math

5/3x+1/3x=3x+40/3+7/3x 3(5/3x+1/3x)=3(3x+40/3+7/3x) 7x+1x=9x+9+7x 7x=17x+9x=9

97. ## math115

I have tried and tried I just do not get it 6-5(3x-4)=-49 6-15x+20=-49 11-15x=-49 11-15=-49-49 15x=-98 x=6

98. ## math115

3y-10+y+46=8y+40-6y I thought the answer was 3 or 3.33

99. ## math

-1/2-(-5/8)=1/8 -3.4-(-7.6)=4.2 The lowest temperature ever recorded in the state of Oregon was 54°F (in Seneca, on February 10, 1933). The state’s record high temperature occurred in Pendleton on August 10, 1898, when it reached 119°F. What is the