# Questions Asked onOctober 7, 2014

1. ## Chemistry

What is the enthalpy change for the first reaction? Fe2O3(s) → 2Fe(s) + 3/2O2(g) ΔH = 4Fe(s) + 3O2(g) → 2Fe2O3 (s) ΔH = -1,652 kJ I think I'm supposed to rearrange the equation and double everything but enthalpy isn't my strong suit

2. ## Chem

when 21.70 ml of 0.5000 m h2so4 is added to 21.70 mL of 1.000 M KOH in a coffee cup calorimeter at 23.50 degrees c, the temperature rises to 30.17 degree c. calculate delta H of this reaction (Assume that the total volume is the sum of the individual

3. ## Physics-Intro

A bullet with mass 60.0 g is fired with an initial velocity of 575 m/s from a gun with mass 4.50 kg. What is the speed of the recoil of the gun?

4. ## Math

1. Find the 11th term of the geometric sequence 64, -32, 16, -8, … . 2. Find the 1st term of a geometric sequence with a 10th term -1024 and r = -2. 3. Find the sum of each infinite geometric series, if possible. a. 10 + 2 + 2/5 + ..... b. 1.2 – 2.4 +

5. ## Physics

A ball rolling with initial velocity of 40m/s(W) undergoes an acceleration of 5.0m/s^2(N) for a period of 6.0seconds. (A) what is the final velocity of the ball? (B) what is the displacement of the ball in the 6.0 sec

6. ## Calculus

Suppose that two boats leave a dock at different times. One heads due north, the other due east. Find the rate at which the distance between the boats is changing when the first boat is 56 miles from the dock traveling at a speed of 35 miles per hour and

7. ## Calculus

An airplane flys at a constant altitude of 2 miles and a constant speed of 600 miles per hour on a straight course that will take it directly over a kangaroo on the ground. How fast is the angle of elevation of the kangaroo's line of sight increasing when

8. ## algebra 2

Graph the system of constraints and find the value of x and y that maximize the objective function. Constraints {x >= 0 y >= 0 y

9. ## physics intro

A ball of mass 0.50 kg is thrown straight up at 6.0 m/s. (a)What is the initial momentum of the ball? (b) What is the momentum of the ball at its peak? (c)What is the momentum of the ball as it hits the ground

10. ## Chemistry

Any help would be greatly appreciated! Substances A, B, and C can all act as oxidizing agents. In solution, A is green, B is yellow, and C is red. In the reactions in which they participate, they are reduced to A-, B-, and C- ions, all of which are

11. ## Math

For this problem, a person standing on the edge of a cliff throws a rock directly upward. it is observed that 2 secs later the rock is at its maximum height (in feet) and that 5 secs after that (meaning 7 seconds after being thrown) the rock hits the

12. ## Algebra

To make an enclosure for chickens, a rectangular area will be fenced next to a house. Only 3 sides will need to be fenced. There is 120 ft. of fencing material. a. What quadratic function represents the area of the rectangular enclosure, where x is the

13. ## Math

For the most recent year available, the mean annual cost to attend a private university in the United States was \$20,082. Assume the distribution of annual costs follows the normal probability distribution and the standard deviation is \$4,500. Ninety-five

14. ## Chemistry

---This was the previous one--- Substances A, B, and C can all act as oxidizing agents. In solution, A is green, B is yellow, and C is red. In the reactions in which they participate, they are reduced to A-, B-, and C- ions, all of which are colorless.

15. ## Social Studies

Question: How do yo pronounce the "Tankadere", the name of a ship in the novel "Around the World in Englty Days?

16. ## Chemistry

The concentration of a certain sodium hydroxide solution was determined by using the solution to titrate a sample of potassium hydrogen phthalate (abbreviated KHP). KHP is an acid with one acidic hydrogen and a molar mass of 204.22 g/mol. In the titration

17. ## Math

A piece of wood is 8 and 7/8 in. long is cut a piece 45 1/2 in. long. If 1/16 is wasted for the cut, how much wood is left.

18. ## Chemistry

A pure white solid material that looks like table salt releases gas when heated under certain conditions. There is no change in the appearance of the solid, but the reactivity of the material changes. Did a chemical or physical change occur? How do you

19. ## English

Am i correct? Since I have never actually been on a plane, my fear of flying is purely __________; my fear of tight spaces, however, is __________ and based on past experiences. acute…deliberate fatuous…gregarious theoretical…authentic

20. ## Statistics

A household appliance manufacturer wants to analyze the relationship between total sales and the company's three primary means of advertising (television, magazines, and radio). All values are in millions of dollars. They found the following regression

21. ## Health

13. How does regular exercise help to reduce the effects of mental stress? A. People who regularly exercise are happy people and are fun to be around. B. Regular exercise gives you better mental discipline, so you're better able to ignore stress. C.

22. ## Intro Physics - Newton's third rule

a piano mover raises a 1000 N piano at a constant speed using a very light rope in a frictionless pulley system. with what force is the mover pulling down on the rope? Show steps please! Thank you!

23. ## Math

Eleanor and Max used two rectangular wooden boards to make a set for the school play. 1 board was 6 ft long, the other was 5 1/2 ft long. The 2 boards had equal widths. The total area of the set was 60 3/8 square ft. What was the width?

24. ## math

writing to explain write a story problem using ten \$100 bills,nine\$10 bills,and twenty \$1 bills.

Consider the statement: If two whole numbers are even, then their sum is odd. What assumption should be made to prove the statement indirectly? A- The numbers are equal. B- The numbers are not equal. C- Their sum is not odd. D- Their difference is even. My

26. ## PHY1015S

A policeman in a stationary car measures the speed of approaching cars by means of an ultrasonic device that emits a sound with a frequency of 41.2 kHz. A car is approaching him at a speed of 33.0 m/s. The wave is reflected by the car and interferes with

27. ## physics

A 35.9 kg child starting from rest slides down a water slide with a vertical height of 20.3 m. (Neglect friction.)What is the child speed half way down

28. ## psychology

The the psychological perspective of empiricism (the belief that your knowledge of the world is based on careful observation and not common sense or observation) fall relate more to the concept of "nature" or "nurture"? I'm currently leaning more towards

29. ## physics

an arrow is shot from a crossbow. How long will it take the arrow to accelerate from rest to a speed of 152 m/s if the crossbow can accelerate the arrow at a rate of 1.35 x 10^4

30. ## math

Carla Compra borrowed \$800 at 14% for one year. She paid a \$15 processing fee. The interest paid will be \$. Thus, the total finance charge (the interest plus the processing fee) will be \$ Therefore, to the nearest tenth, the APR = total finance charge ÷

31. ## Math22

1. Write the composite function in the form f(g(x)). [Identify the inner function u = g(x) and the outer function y = f(u).] y= (g(x), f(u)) = 2. Write the composite function in the form f(g(x)). [Identify the inner function u = g(x) and the outer function

32. ## Chemistry

A fictitious element X is composed of 10.0 percent of the isotope 55^X , 20.0 percent of the isotope 56^X , and 70.0 percent of the isotope 57^X . Calculate the weighted atomic mass of element X to the nearest tenth.

33. ## Physics

A 0.600-kg ball traveling 4.00 m/s to the right collides with a 1.00-kg ball traveling 5.00 m/s to the left. After the collision, the lighter ball is traveling 7.25 m/s to the left. What is the velocity of the heavier ball after the collision?

34. ## Math

1. Find the value of k so that 2, k^2, 8 form a geometric sequence. 2. Water is leaking from a water tower. On the first day, two gallons were lost. The leak is getting progressively worse and the amount of water lost triples each day. How many gallons

35. ## psychology

The the psychological perspective of empiricism (the belief that your knowledge of the world is based on careful observation and not common sense or observation) fall relate more to the concept of "nature" or "nurture"? I'm currently leaning more towards

36. ## interior decorating

In which of the following ways do the Montessori organizations differ from the other accrediting groups you learned about in your study unit? A. Your facility must be evaluated by an accreditation committee. B. You must be a member of the organization

Management by objectives works best when the objectives of each organizational unit are derived from A. the social environment. B. the objectives of a competitor. C. the objectives of the next higher unit in the organization. D. a functional or general

38. ## Math

Having a lot of trouble with this one: Q) Tidal volume is the volume of air displaced in the lungs between inhalation and exhalation (the amount of air in a breath). The residual volume is given by the remaining in the lungs even after the deepest

39. ## Physics

You are the juror of a case involving a drunken driver whose 972 kg sports car ran into a stationary 2094 kg station wagon stopped at a red traffic light. The cars stuck together and slid with locked wheels for 11.0 m before coming to rest. The coefficient

40. ## chemistery

What is the molar concentration of a solution of sulfuric acid, H2SO4, if 4.64 mL react completely with 0.644 g of NaOH which was dissolved in 200 mL of water? Hint given in feedback

41. ## math

A 12-foot tree casts a 22-foot shadow. Find the angle of elevation from the tip of the shadow to the top of the tree. Round the answer to the nearest tenth.

42. ## Algebra

Emilio has 8,450 trees to plant in rows on his tree farm. He will plant 125 trees per row. How many full rows of trees will he have? Explain. Thanks

43. ## Physics HELP

Two blocks having mass m1 = 6 kg(m1 on ramp of 30 degrees) and m2 =3 kg are connected by a light rope and slide on a frictionless surface as in the figure below. A force F = 10 N acts on m2 at 20 degrees relative the horizontal. Find the acceleration of

44. ## calculus 1

Suppose that a person’s blood pressure at time t in seconds is given by p(t) = 100 + 18 sin (7t). (a) During each heartbeat, what is the systolic pressure (maximum blood pressure) and the diastolic pressure (minimum blood pressure)? (b) According to this

45. ## chemistry

Mass (g) of solute in 179.8 mL of 0.267 M calcium acetate

46. ## math

John tosses a penny 10 times and finds that 2 of those times the penny comes up heads and 8 of those times the penny comes up tail. What should John conclude? a.That the expected relative frequency probability of getting heads when tossing a penny is 2/10.

47. ## MATH

A boat on a river travels 16 miles downstream in only 2 hours. It takes the same boat 7 hours to travel 28 miles upstream. What are the speed of the boat and the speed of the current?

48. ## Chemistry

A student mixes four reagents together, thinking that the solutions will neutralize each other. The solutions mixed together are 50.0 mL of 0.100 M hydrochloric acid, 100.0 mL of 0.200 M of nintric acid,500. mL of 0.0100 M calcium hydroxide, and 200.0 mL

49. ## Pre-Calc/Trig...

Explain how the graph of the given function is a transformation of the graph of y=x^2 *y=x^2+7

50. ## Statistics

`The average grade point average (GPA) of undergraduate students in New York is normally distributed with a population mean of 2.5 and a population standard deviation of 0.4. Compute the following, showing all work: 1) The percentage of students with GPA's

51. ## Math

If a ball is thrown vertically upward from the roof of 48 foot building with a velocity of 80 ft/sec, its height after t seconds is s(t) = 48+80t-16t^2 What is the velocity of the ball when it hits the ground?

52. ## Grammar

In each sentence, underline the words that make up the compoound subject. Circle the conjuction that joins the subjects. (I've underlined and circled using parentheses.) 1. An elederly man and a young family with two crying babies shared our table. A: An

53. ## World History Answer Check (Ms. Sue)

1. Explain the goals of European leaders at the Congress of Vienna. A: The European leaders at the Congress of Vienna strived to restore the old order. In other words, their goal was to maintain "the stability of political institutions against the

54. ## Algebra

In preparation for a storm, the town council boys 13,750 pounds of sand to fill sandbags. Volunteers are trying to decide whether to fill bags that can hold 25 pounds of sand bags or bags that can hold 50 pounds of sand. Will they have more or fewer

55. ## math

If a student scored an average of 60% on a test, what score would he/she need to average it out to a passing 80+. What formula would you use. This isn't a question on a test, it's one I've been trying to find. I am able to retake a test multiple times and

56. ## Math

A projectile is shot upward from the earth with an initial velocity of 320 ft/sec. (a) What is the velocity after 5 secs.? ft/sec. (b) What is the acceleration after 3 secs.? ft/sec^2.

57. ## Math

leslie is in charge of packing snacks for her class. she has 30 cookies and 20 apples. she wants to put the same number of cookies and the same number of apples in each pack. what are the possible numbers of packs she can make? how many items are in each

58. ## Math

A bag contains 8 green marbles and 4 blue marbles. If two marbles are drawn in succession without replacing them in the bag, what is the probability of drawing a green marble on the second draw?

59. ## bank loans

if i barrow \$3000 at a bank for 12% simple interest for 18 months how much are my monthly payments?

we all know that babies make funny sounds. Little by little, babies learn that some sounds will call their mother and father. Other sounds will get them food. yet some sounds will bring them nothing at all. Babies learn to talk by finding out which sounds

61. ## Physics

A stunt pilot is attempting to drop a water balloon from a moving airplane onto a target on the ground. The plane moves at a speed of 82.8 m/s and a 49° above the horizontal when the balloon is released. At the point of release, the plane is at an

62. ## Math

1. Find the common ratio and the 7th term of the sequence 2/9, 2/3, 2, 6, 18, ..... 2. The 3rd and 5th terms of a geometric sequence are 2 and 1/2 respectively. What is the first term? 3. Find the geometric mean between: a. 1/2 and 1/3 b. sqrt5 - sqrt2

63. ## Calculus

slope of tan line to the ellipse is -4x/y for x^(2)/4+y^(2)/16 Are there any points where the slope is not defined? (Enter them as comma-separated ordered-pairs, e.g., (1,3), (-2,5). Enter none if there are no such points.) slope is undefined at

64. ## math

When Kaitlin divided a fraction by 1/2,the result was a mixed number.Was the original fraction less than or greater than 1/2? Explain your reasoning

65. ## Pre-Calc/Trig...

Explain how the graph of the given function is a transformation of the graph of y=x^2 *y=(x+5)^2

66. ## Math

Carter got the following scores on Science tests: 78,82,88,90,93. What is the mean deviation?

67. ## physics

A basketball player is standing on the floor 10.0 m from the basket as in the figure below. The height of the basket is H = 3.05 m, and he shoots the ball at an angle, è = 42.8°, with the horizontal from a height of h = 2.04 m. (a) What is the

68. ## chemistry

How many grams are in 2.5 moles of magnesium hydroxide

69. ## English

1. They got a train to New York. 2. They got a train for New York. 3. They caught a train to New York. 4. They caught a train for New York. (Are they all grammatical and the same in meaning? Which ones are commonly used?)

70. ## algebra

the formula v=64h can be used to find the velocity,v,in feet per second,of an object that has fallen h feet.find the velocity of an object that has fallen 75 feet.round to the nearest tenth

71. ## math

A solution contains 100 mg/mL of a drug, and the recommended dose is 50 mg/lb once a day. How much solution would be needed for one dose to be administered to a 20kg patient?'

72. ## Algebra

The height h(t) measured in feet of an object dropped by an astronaut on the moon can be approximated by h(t) = h0 (0 on the bottom) - 2.7t^2, where h0 is the height from which the object was dropped. About how long would it take an object to fall to the

73. ## Math

1.) If a = 2 and the vertex of a parabola is (3, -4), will there be a minimum or maximum value for the parabola? What is the value? 2.) If a = 2 and the vertex of a parabola is (3, -4), what is its axis of symmetry?

74. ## Statistics

On this semesters final exam, john scored 72 on his calculus exam, (class distribution (u=65, \σ=3.57)\) ) and 53 on his statistics exam (class distribution :u=49, σ=2.04. Which exam should he get the better grade. z1=72-65/3.57=1.960 Z2=53-49/3.57=1.120

76. ## Math

What is the sum of decimals? 0.28 + 0.62 = Write to explain how you found your answer.

Not really sure what to do for this problem. this was how it was worded on worksheet. Larue scored 10 points less than 3 times the number of points that Ross scored. Larue scored 11 points. How many points did Ross score?

78. ## College chem

what is the empirical formular of the following compound: 0.142 g phosphorus with 0.436 g of fluorine.

79. ## Maths

Really really need some help here., There was an I.T. Fair. 2/9 of the visitors were children. There were 4000 more adults than children. The ratio of boys to the number of girls was 3:5. The ratio of number of men to number of women was 3:1. Find the

80. ## stats

18. Numerous studies have found that males report higher self-esteem than females, especially for adolescents (Kling, Hyde, Showers, & Buswell, 1999). Typical results show a mean self-esteem score of M = 39.0 with SS = 60.2 for a sample of n =10 male

81. ## Maths

Hi can someone Help me ? The number of cartons of juices to the number of cartons of milk to the number of cartons of soft drinks is in the ratio of 12 : 5 : 1. There are 66 more cartons of juices than soft drinks. How many cartons of milk are there?

82. ## Values

Why do teenagers rebel?

83. ## math

A band played 3 concerts and earned a total of \$321.00. The band earned about the same amount for each concert. Estimate how muchthe band earned each night.

84. ## Atmosphere

What is the approximate cloud top height? if I am giving different heights, environmental temps, Relative Humidities, and parcel temps, how can I calculate this ^^ Thanks!

85. ## Physics

A ball rolling with initial velocity of 40m/s(W) undergoes an acceleration of 5.0m/s^2(N) for a period of 6.0seconds. (A) what is the final velocity of the ball? (B) what is the displacement of the ball in the 6.0 sec

86. ## Math

How do you find the slope of a line? And how can you tell which point is x or which one is y

87. ## Algebra

During a food drive, a local middle school collected 8,982 canned food items. Each of the 28 classrooms that participated in the drive donated about the same number of items. Estimate the number of items each classroom donated. Please help answer thanks

88. ## Math

How to find the slope of a STRAIGHT Line

89. ## physics

. The altitude of a plane as it begins to descend is shown by the linear equation a = 22,000 – 800m, where a is the plane’s altitude, in feet, and m is minutes. What is the plane’s altitude when m = 12 ft

90. ## Values

What are the problems undergone by teenagers?

91. ## math

a fish tank that holds 80 gallons of water is 55 percent full how many gallons are in the tank now and how many more gallons are needed to fill the tank

92. ## Algebra

There are 1,012 souvenir paperweights that need to be packed in boxes. Each box will hold 12 paperweights. How many boxes will be needed?

93. ## AP Calculus

Using the definition of derivative find f'(x) when f(x) = (1/sqr x) + x.

94. ## Social studies

3.how were farms of the new england colonies similar to the farms of the up country A.separating church and state B.requiring all laws be approved by the council*** C. Creating a jury system for legal decisions D. Giving the people a stronger voice in the

95. ## calculus

An airplane flys at a constant altitude of 2 miles and a constant speed of 600 miles per hour on a straight course that will take it directly over a kangaroo on the ground. How fast is the angle of elevation of the kangaroo's line of sight increasing when

96. ## Science--2 questions! asap!

During the processes of erosion and deposition, sediments that are the_____ in size will be carried the greatest distances before being deposited. Most___rocks form under conditions found a few kilometers under Earth's surface.

97. ## Algebra

During a promotional weekend, a state fair gives a free admission to every 175th person who enters the fair. On Saturday, there were 6,742 people attending the fair. On Sunday, there were 5, 487 people attending the fair. How many people received a free

98. ## Science

Identify the process that represents how organisms grow and replace old are damaged cells. My answer: This process is called mitosis. Am I correct?

99. ## Chemistry

A reaction uses 4.5 grams of oxygen and an excess of nitrogen. How many grams of dinitrogen pentoxide are produced?

100. ## CHEMISTRY 56

Aerosol cans have a label that warns the user not to use them above a certain temperature and not to dispose of them by incineration. Even an empty can contains residual gaseous propellant. For example, the residual pressure in a can is 1.16atm when it is

101. ## Chemistry

Earlier I asked /display.cgi?id=1412727782 (tyvm btw) Say you have these A, B, and C solutions. Now you have an unknown colorless solution that contains either NaA, NaB, or NaC. In solution, each salt dissociates completely into the Na+ ion and the anion

102. ## Physics

How much force does it take to stretch a 15-m-long, 1.0 cm -diameter steel cable by 6.0mm ? I know f/a divided by change in length/l knowns are diameter 1.0cm, change in lngth 6.0mm, length 15 m. Convert all to meters.

A scientist observes that termites are fed a certain antibiotic die a starvation after a few days. The scientist also notices that certain protists that live inside the termites guy are affected by the antibiotic in a peculiar way: although the protists

104. ## chemistry

If the concentration of pure o-xylene in hair above a pool of pure o-xylene is 200 g/m3 at 25 C which direction can o-xylene move vapor pressure of pure o-xylene is 0.00871 atm

105. ## math

Jonah wants to buy two copies of a book. Which algebraic expression could Jonah use to find the value of the items?

106. ## physics

A satellite is in a circular orbit around an unknown planet. The satellite has a speed of 1.80 104 m/s, and the radius of the orbit is 5.20 106 m. A second satellite also has a circular orbit around this same planet. The orbit of this second satellite has

107. ## physics

The x component of a displacement vector r is −149 m, while its y component is −174 m. (a) Find the magnitude of r. (b) Find the direction of r.

108. ## US History

The Revolutionary War could be considered an international war. Explain if this statement is true or false using examples.

109. ## Engineering Calc.

Water is leaking out of an inverted conical tank at a rate of 6700.0 cubic centimeters per min at the same time that water is being pumped into the tank at a constant rate. The tank has height 7.0 meters and the diameter at the top is 4.0 meters. If the

110. ## Science

How do you define a controlled experiment?

111. ## physics

A mass m = 6.0 kg is attached to the lower end of a massless string of length L = 27.0 cm. The upper end of the string is held fixed. Suppose that the mass moves in a circle at constant speed, and that the string makes an angle theta = 28° with the

112. ## Math

An airplane flys at a constant altitude of 2 miles and a constant speed of 600 miles per hour on a straight course that will take it directly over a kangaroo on the ground. How fast is the angle of elevation of the kangaroo's line of sight increasing when

113. ## chemistry 112

A volume of 60.0mL of aqueous potassium hydroxide (KOH) was titrated against a standard solution of sulfuric acid (H2SO4). What was the molarity of the KOH solution if 19.2mL of 1.50 M H2SO4 was needed? The equation is

114. ## chemistry

An experiment to determine compound partition among air, water, and soil phases was conducted by adding 1 gram of the compound to a reactor that had 1 m3 of air, 0,001 m3 of water0 and 100 g of solid. The reactor was at atmodpheric pressure and at

115. ## Satue of Liberty

I know this may seem like quite a weird and/or stupid question. The Statue of Liberty has a crown with 7 spokes on it. Do they represent the 7 seas, or continents? I get them confused... Thank you.

116. ## Physics

Buddy is unloading 7kg cans using a 45 degree downward ramp. The ramp was made slippery by the a detergent spill before. Buddy can push the cans off of his truck with an initial velocity of .2 m/s and it moves as 1.2 m/a by the time it reaches the lowest

117. ## chemistry

Calculate the air concentration (mol/l) of phenol in equilibrium with solution including 100 g/m3 of phenol.(T=20 C)

118. ## Math

1. A teacher teaches 8 students how to fold an origami model. Each of these students goes on to teach 8 students of their own how to fold the same model. If this teaching process goes on for 6 generations, how many people total will know how to fold the

119. ## chemistry

A metal rod has a mass of 17.62 g. A graduated cylinder contains 29.9 mL of water. The metal rod is added to the cylinder. The final water level in the cylinder is 36.1 mL. What is the density of the metal rod?

120. ## MATH

THE AMOUNT OF CLOTH USED TO MAKE FOUR CURTAINS IS GIVEN BY THE FUNCTION A=-4X^2 + 40X WHERE X IS THE WIDTH OF ONE CURTAIN IN FEET AND a IS THE TOTAL AREA IN SQUARE FEET. FIND THE WIDTH THAT MAXIMIZES THE AREA OF THE CURTAINS. WHAT IS THE MAXIMUM AREA?

for this assignment i have to write summary for each stanza the poem is Nikki-Rosa by Nikki giovanni my answers Stanza 1-when you remember your childhood you think about your life. stanza 2- white people never talked about happiness and how your mother

122. ## calculus

Find the slope of the tangent line to the curve (2x+4y)^1/2+(2xy)^1/2=13.4 at the point (6,5).

123. ## chemistry

in a empirical formula lab how do you calculate the number of moles of Cu in 0.0114 moles of CuSo4*H2O? Thanks

124. ## Algebra

A rectangular region with one side against an existing building is to be fenced in. Assume that there is 150 ft of material available. Since one side is the building, you will use your material to construct 3 sides of the rectangle.

125. ## Physics Help Fast Please :)

Question 2.2. A book is given a sudden push to make it slide along a desktop. If the initial speed of the slide is doubled, by what factor is the distance that the book slides changed? (Points : 1) 0.5 0.25 2.0 4.0 Question 3.3. A 720 kg roller-coaster car

126. ## math/physics

A 0.600-kg ball traveling 4.00 m/s to the right collides with a 1.00-kg ball traveling 5.00 m/s to the left. After the collision, the lighter ball is traveling 7.25 m/s to the left. What is the velocity of the heavier ball after the collision?

127. ## History Help!?

How did flooding rivers contribute to the beginning of farming communities? A. They irrigated the crops when they overflowed. B. They created a marshy environment good for planting. C. They provided water and stayed within their banks. D. They left rich

128. ## Math

At noon, a hot air balloon was at an elevation of 2,400 feet. One hour later it was at an elevation of 1,400 feet. A: write an expression you can use to find the altitude from noon to one. B: solve the expression. i am not sure what to do on this.

129. ## pre-calculus

A machine worth \$10,000 new and having a scrap value of \$1000 is to be depreciated linearly over an 18-year life. What will be the value of the machine after 9 years?

130. ## Math

If I spoke to someone for 60 minutes and then spoke to them again for 41 minutes, would that mean I spoke to them for 1 hour 41 minutes? 60+41=101 minutes?

131. ## chemistry

what is the molar ratio of 0.114 copper to 0.116 oxygen? Then how do you make an empirical formula from this information?

132. ## chemistry

what could cause the difference in the actual number of mole and the expected number of mole in copper oxide?

133. ## Social Studies

which of the following best describes the purpose of the U.S constitution? A. It restricts rights of citizens. B. it outlines how the government should make laws. C. it establishes a national bank. D. it outlines basic rights for the people of all nations

134. ## english

people of all ages and abilities love sports. Which is the subject and which is the predicate in this sentence

135. ## Math

A submarine begins at -125 below sea level. If the submarine travels at 20 feet per minute, how many minutes would it will take the submarine to rise to the surface and then defend to -104 feet? A: 6 1/4 B: 11 2/9 C: 5 1/5 D: 11 9/20 I said C but it was

137. ## social studies

1.How were the farms of New England colonies similar to the farms of the up country? a. They grew rice b. They were plantations*** c. They had short growing seasons d. They were small subsistence farms 2.Rice grew successfully in south Carolina because

138. ## math

math estamate 56,225 divided by 48

139. ## Soil Science!

Given the following soil properties, find the % of water by weight at soil saturation with water: Moist sample weight: 202.16 Oven dry sample weight: 197.8 Bulk Volume:118.86 Particle Volume Density: 73.73 Soil bulk density: 1.66 soil particle density:

Which one of the following quotes suggests a leader with an attitude consistent with Theory Y? A. “These people hate work. If possible, they would never come in.” B. “My advice to you as a new manager is to be firm with your people. Otherwise, they

141. ## math(fractions)

what is 9/10 times 25/6.i got 225/60 but its not on my answer sheet.i need to simplify. It's not on my answer sheet. please help. its a puzzle.

142. ## Science

make an observation of food waste occurring in your home and write at least two sentences describe the waste that has occurred.

143. ## math help

What are the domain and range of the relation {(4, 2), (0, 1), (0, 5), (8, 10)}?

144. ## Math

a truck can be rented from company a for 100 a day plus 0.60 per mile and company b charges 50 a day plus 0.80 per mile to rent the same truck. find the number of miles in a day at which the rental costs for company a and b are the same. Please answer in

145. ## Chemistry

The synthesis of zinc iodide was performed using 1.8912g of zinc and 1.5965g of iodine. Determine the limiting reactant and calculate the theoretical yield of zinc iodide in grams.

1. A vertical division of labor is based on A. the establishment of lines of authority. B. the specialization of work. C. the rotation of tasks. D. improved efficiency through repetitive simple tasks. 2. Above all, an appropriate organizational structure

147. ## Calculus question

It looks very complicated and I do not know how to even start. Any help would be immensely appreciated. A pendulum has a mass, m, suspended from a rod of length L. At the time t = 0, the pendulum is pulled through an angle θ0 > 0 to the right and given an

148. ## math

Evaluate: -3/4 - 1 3/8 A: - 17/8 B: -1 C: 17/8 D: -5/8 I put C but its was incorrect. I'm to sure what the correct answer would then be. can you show me how to solve it and how to achieve the correct answer?

149. ## Earth Science

Unlike most road maps, topographic maps can be used to find 1: the best route to a town 20 km away. 2: the temperature at any place on the map 3:the elevation above sea level. 4:the distance between two locations

150. ## Physics

I need to determine maximum tension/down force with a pendulum. I need to use the lightest string possible to: -support a 16kg bob, with -a velocity of 4m/s -with a swing radius of 2m -at it's equilibrium (ie 0 degrees) -given standard gravity. using

151. ## Health

1. If you're aerobically fit, you can A. run a marathon without experiencing fatigue. B. quit your normal exercise routine without any negative effects. C. sustain a regular routine of exercise for 30-60 minutes with minimal fatigue. D. lift very heavy

152. ## Language Arts

Hello everyone! I was just wondering if you could revise this autobiographical essay for me? Thanks for your time! *** **** 10/5/14 Ever since I can remember I have lived in Philadelphia. I have many nice memories from Philadelphia, and I am fortunate

153. ## Algebra

The height h(t) measured in feet of an object dropped by an astronaut on the moon can be approximated by h(t) = h0 (0 on the bottom) - 2.7t^2, where h0 is the height from which the object was dropped. About how long would it take an object to fall to the

154. ## Physics

A 0.339 kg book rests at an angle against one side of a bookshelf. The magnitude and direction of the total force exerted on the book by the left side of the bookshelf are given by: What must the magnitude and direction of the total force exerted on the

155. ## Chemistry

I do not know how to solve this problem. Could you show me how? You have a stock solution of 5.00M H3PO4. a.) What would be the concentration if 20.0mL of the stock solution is diluted to 250.0mL? b.) What volume of the dilute solution would you need if

156. ## math

grace made 6 out of 10 shots at the basket ball game. what percentage of shots did she make?

157. ## com 200

All of the following are true of what typically occurs when first meeting someone EXCEPT:

158. ## Physics

A 25.0-g metal cylinder is placed on a turntable, with its center 70 cm from the turntable's center. The coefficient of static friction between the cylinder and the turntable's surface is μs = 0.71. A thin, massless string of length 70 cm connects the

159. ## physics

A circular curve of highway is designed for traffic moving at 93 km/h. Assume the traffic consists of cars without negative lift. (a) If the radius of the curve is 110 m, what is the correct angle of banking of the road? (b) If the curve were not banked,

160. ## Math

A ball that is hit or thrown horizontally ball that is hit or thrown horizontally with a velocity of v metres per second will travel a distance d metres before hitting the ground, where d=v square root h/ 4.9 and h is the height, in metres, from which the

161. ## Pre-Calc/Trig..

Write a function for the graph described as a transformation of y=x^2 y=x^2 experiences a vertical stretch of factor 2 and then a shift right of 3 units.

162. ## Math

What is -3.702 + -9.78?

163. ## Biology

How is PKU related to homeostasis?

164. ## SS

What are some examples of contrasting landforms? (Desert/glacier, etc)

165. ## Algebra

Are the zeros of g(x) = 2x^2 - 12x + 40 and g(x) = x^2 - 6x + 20 the same?

166. ## help plz

Which relation is a function? {(5, 1), (4, 9), (6, 10)} {(0, 3), (0, 9), (12, 4)} {(5, 5), (5, 9), (5, 15)} {2, 10), (6, 10), (2, 3)} the third one?

167. ## English 10

1. Read the following sentences from "Lifeguard Rules!" “That’s it, Ira and Michael,” Francesca had said. "You guys don’t get a third warning. Go spend fifteen minutes out of the water. I’ll inform you when I’m ready to see you in the pool

Which statement best describes inductive reasoning? A- It uses previously proven or accepted properties to reach a conclusion. B- It uses observation of patterns and past events to reach a conclusion. C- It uses any convenient method to reach a conclusion.

169. ## Algebra

The diameter of the moon is about 3476 kilometers. The distance from earth to moon is about 384,400 kilometers. About how many moons could be lined up in a row between earth and the moon? Round to the nearest whole number. Please help answer thanks

170. ## algebra

Rounding 6,156 to the nearest hundred

172. ## histery

Using the Internet, encyclopedia, and/other reference material for research, write a 1,000-word report on feudalism in the history in one of the following countries: •France •England •Germany Include the approximate years when feudalism began and

173. ## math

find the sum of 2 1/2 and 2/5 which of the following makes the statement true? 1/5^0 the area of a certain state is 840,000 square miles. what is this area in scientific notation? which is irrational? A. 0.11711711711... B. o.8596873205... C.

175. ## Algebra

A ball is thrown into the air with an initial upward velocity of 45 ft/s. Its height (h) in feet after t seconds is given by the function h = –16t² + 45t + 6. After about how many seconds will the ball hit the ground? (1 point) 3 4 My ans?? 5 6

176. ## math

A jar contains 120 pennies. A bigger jar contains 1 1/4 times ss many pennies. What is the value of the pennies in the jar?

177. ## English

The damage those rumors did to the actor's reputation is __________, so it is somewhat understandable that he became so __________ and bitter towards the members of the press who spread lies about him. genial…zealous odious…impeccable wanton…sublime

178. ## science

Astronomers think planets formed from interstellar dust and gases that clumped together in a process called _____. stellar evolution nebular aggregation planetary accretion nuclear fusion

179. ## CHEMISTRY

If you use a dirty buret, the titrant leaves drops of solution behind as the meniscus descends during delivery of the solution. The volume actually delivered by the buret will be __________ the volume your readings of the buret scale indicate was delivered

180. ## Math

What is amount of money on \$40,500 with 6.2 interest rate for a year

181. ## Algebra I

Fill in the compound inequality 4(x-6) 2(x-10) and 5(x + 2) >/ 2(x +8) with less than, greater than, at least, or at most so that the solution is only one value

182. ## Stats

Which of the following numbers could be a proabilty of an event 0, 1.15, 0.03, -0.43, 1, 0.34

183. ## Calculus

Simplify the expression cot (cos−1(x)). Not sure how to do this.

184. ## MATH

Solve the following equations for x where 0 ≤ x < 2π. tan(x)sin(2x) = √3 sin (x) and cos(2x)−cos(x) = −sin2(x)+1/4  Stuck on these particular types. Have no idea how to start.

185. ## math

a 20 metre length of cloth is cut into two pieces in the ratio 1:9. how long is each piece?

What is the hypothesis of the conditional statement? If you are not there, then I will leave. A-you are there B- you are not there C- I will leave D- I will not leave My choice is B. What is the converse of the conditional statement? If it is Tuesday, then

187. ## program planning

Information provided by a parent on an enrollment form can be shared with unauthorized persons only if _______ gives written consent.

188. ## Math

Luke walks 1 3/4 miles each way to school. Tuesday before he realized he left his lunch at home and had to go back to get his lunch. How many miles did luke walk on wednesday to and from school? A: 3 1/2 B: 4 C: 4 1/2 D: 2 3/4 I don't understand tis one.

189. ## Physics

A cart released from rest at the top of a track 90. cm long takes 4.00 seconds to reach the bottom. determine the velocity after half the time.

Not sure how to do this. Asked before but it was hard to type out the symbols in the equation, so I have a screenshot below. exactly Please help!

191. ## English

is it C??? The author writes that the nobles had "resumed their ancient license in its utmost extent." This means that the nobles had sought to __________. unite with nobles from other nations pay homage and give respect to the king despite his absence

192. ## child day care

child day care facilities and staff question and answer

193. ## physics

A skydiver leaps from a hovering helicopter at 2000 feet. Sketch a small graph showing each of the following from the time she leaves the helicopter until she reaches terminal speed: (a) Force of air resistance. (b) Net force (c) acceleration (d) speed.

194. ## Physics HELP

Two blocks of masses m1 = 6 kg and m2 = 6 kg are on either side of the wedge shown in the figure above. Find their acceleration and the tension in the rope. Ignore friction and the pulley.

195. ## Health

Ms.Sue would you mind looking over the questions for Health at the bottom of page one.I know Brady answered but I just like to hear your okay correct on everything. :-)

Please show me how to do these step by step because I have a test tomorow and I need to understand how to do these questions : 1. M-1 under the square root sign +5= m-2 2. 3n+10 under the square root = n+4 3. K-9 under the square root - (k under square

197. ## p.e

Which of the following is a factor in which you have little control that determines your weight? A. hereditary B. Activity level C. Peers D. Body composition C?

198. ## World History Answer Check (Ms. Sue)

1. Why did employers feel the need to discipline factory workers? A: Employers felt the need to discipline factory workers because they wanted to ensure that all workers were performing at their maximum output. 2. Why was the railroad important to the

199. ## 7th grade math word problems

While scuba diving Quentin descended 2 1/3 feet each second for 30 seconds. If Quentin ended up at a depth of -234 feet before he began his descent, what was his original depth? Do I multiply 2 1/3ft by 30 seconds?

200. ## Chemistry

A hot air balloon is filled with 1.23 × 106 L of an ideal gas on a cool morning (11 °C). The air is heated to 121 °C. What is the volume of the air in the balloon after it is heated? Assume that none of the gas escapes from the balloon.

201. ## Math

The New York State Lottery advertises that for its instant lottery games there is a 4 in 21 chance of winning. If you buy only 1 instant lottery card, what is the chance you will win? I think the answer is 4/21 but am not sure.

202. ## Math

Does 1.645 round to 1.65?

203. ## statistics

Mean time 79 min Standard deviation 8 min what is the probability of doing it in 60 min or less

Can you check my answers please. 1. Joe and his friends at 3/8 of pie. If the pie was cut into 8 pieces, how many pieces are left? Ans: 8/8 - 3/8 = 5/8 pieces left 2. Michaela walked 2/5 miles to the store in 1/4 hour. What's her walking pace? Ans:

205. ## CAL

Hi, im lost in theses three problems. Please help. Thank you so much!!! 1. Write the composite function in the form f(g(x)). [Identify the inner function u = g(x) and the outer function y = f(u).] y = 3 squareroot all 1 + 5x (g(x), f(u)) = ??????? Find the

206. ## physics

A force is applied to an initially stationary block of mass 1.75 kg that sits on a horizontal floor as shown. The 53.5 N force is applied at θ = 32° angle. The coefficients of friction between the floor and the block are μs = 0.593 and μk = 0.343. What

207. ## math

calculate, to one decimal place, the amount of fencing you would need to enclose a square garden of 6m squared

209. ## math

calculate, to 1 decimal place, the amount of fencing you would need to enclose a square garden that is 42m squared

210. ## Physics-Intro

A 0.600-kg ball traveling 4.00 m/s to the right collides with a 1.00-kg ball traveling 5.00 m/s to the left. After the collision, the lighter ball is traveling 7.25 m/s to the left. What is the velocity of the heavier ball after the collision?

211. ## Math

in a rectangle the measures of the base and the altitude are in a ratio of 1:4. I f the rectangle is equal in area to a square with a perimeter of 60 feet, find the dimensions of the rectangle HELP PLEASE TYSM!!

212. ## finance

1.Bill and Warren are thinking about issuing 11 percent coupon bonds that will mature in 15 years. Market interest rates are 13 percent. What could they sell each of the bonds for?

213. ## CHEMISTRY

what do you observe if you drop water to a basin of water? Explain please

214. ## cal 33

I have a quick question. When I did this I got my derivative but one question is asking when Rearranging this, we get 8y7y' = ???? i don't know We now have d/ dx [x5 + y8] = 5x4 + 8y7y' = d/ dx  = 0. Solving for y', we conclude that the derivative is y'

215. ## CHEMISTRY

what do you observe on the seawater where ships dock? Explain in relation with attractive forces and surface tension..

216. ## Social Studies

How was the homestead act: -impacted history -impacted the future -was important need help!!!!!

217. ## Grammar

What is the correct pronoun for each sentence? 1. The first girl chosen was (she,her). 2. He treasure hunters, (he and her, he and she), were interviewed by reporters. 3. Mike and (she,her) are leaving tomorrow. 4. Lebron and (he, him) have been

218. ## Science urgent help

A scientist observes that termites are fed a certain antibiotic die a starvation after a few days. The scientist also notices that certain protists that live inside the termites guy are affected by the antibiotic in a peculiar way: although the protists

219. ## English

But at the ticket office he learns that it's leaving early - that evening. -------------------- Q1: What other verbs can we use instead of 'learns'? the meaning of 'learns' here is _______. Q2: What is the function of '_' in the sentence?

220. ## Math

Is 0.600 kg lighter than 1.00kg?

221. ## Physics

A plane starts from rest at the end of a runway and requires 200.0 km/h for takeoff . If it takes 30.0 a to reach takeoff speed, what acceleration must the plane's engines provide to get off the runway ?

222. ## statistics

On this semester’s final exam, Susie scored 72 on her classics exam (class distribution: μ = 65, σ = 3.57) and 53 on her psychology exam (class distribution: μ = 49, σ = 2.04). For which exam should Susie expect the better grade? a. Classics b.

223. ## physics

You attempt to throw the rock across the chasm with a velocity of 35 m/s at and angle of 60 degrees above horizontal. Calculate and label the forward velocity (components) of the rock as it leaves your hand. How long will it take to reach the top of the

224. ## Physics: momentum

While you are standing on a expanse of smooth ice, your friend throws a heavy ball towards you. How can you maximize your speed after your interaction with the ball? a. More information is needed to determine how you should maximize your speed. b. It

225. ## English

I need some help with point for an essay in English about the great Gatsby. I have a question about development of character or interests, and I don't know how I could write about Gatsby in this idea. I also need the writers style and Fitzgerald's view and

226. ## physics

A 2.27 kg ball is attached to a ceiling by a 1.26 m long string. The height of the room is 2.57 m. What is the gravitational potential energy of the ball relative to the ceiling?

227. ## Math

The ages in years of the houses on Kelly's block are: 20,26,11,2,28,18,2,27. Find the mean, median and the mode. Mean: 16.6 Median: 18.20 Mode: 2 Which measures should I use to represent the ages of the houses? Explain.

228. ## English

1. He got onto the ship. 2. He got on the ship. 3. He went onto the ship. 4. He went on the ship. ------------------------ What is the difference betwen them? Which ones are grammatical? Are they the same in meaning?

229. ## accounting

A company purchased and installed a machine on January 1 at a total cost of \$72,000. Straight-line depreciation was calculated based on the assumption of a five-year life and no salvage value. The machine was disposed of on July 1 of the fourth year. The

230. ## Math

If the area of the ceiling is 129 square feet with one side measuring 10 3/4 how much trim does we need for the ceiling

231. ## Satistics

Assume that the mean hourly cost to operate a commercial airplane follows the normal distribution with a mean of \$2,175 per hour and a standard deviation of \$175. What is the operating cost for the lowest 10 percent of the airplanes? (Round z value to 2

232. ## english

of chapter 5,why is the title called windriders claws