# Questions Asked onDecember 13, 2015

1. ## AP Chemistry

Calculate the delta H rxn for the following reaction: CH4(g)+4Cl2(g)-->CCl4(g)+4HCl Use the following reactions and given delta H's: 1) C(s)+2H2(g)-->CH4(g) delta H= -74.6 kJ 2) C(s)+2Cl2(g)-->CCl4(g) delta H= -95.7 kJ 3) H2(g)+Cl2(g)-->2HCl(g) delta H=

2. ## physics

a dockworker applies a constant horizontal force of 80 N to a block of ice on a smooth horizontal floor. The friction force is negligible the block start from rest and move 11m in 5 sec what is it mass & if worker stop pushing at 5sec .How for does the

3. ## science

find the distance covered when speed is 960 km/hr and time is 1hr 50min.

4. ## math

Find the amount of interest on a loan of \$10,500, at 9% interest, for 124 days using the exact interest method.

5. ## Education and technology

1. What function would you use to find the mean in a microsoft(R) excel document a=ROUND b=AVERAGE c=SUM d=HYPERLINK 2. What is the first thing you should do to find the mean and range of data? a=put the numbers in order from least to greatest b=count the

6. ## FINAN & QUANTITATIVE LITERACY

Your current cell phone company charges \$30 per month for unlimited minutes. Another company charges \$20 per month for the first 500 minutes plus 5¢ a minute for any additional minutes. Should you keep your current service or switch to the other company?

7. ## Trigonometry

A cat, sitting on top of a tree, spots a dog and a firefighter, both on flat ground below. From the cat's point of view, the dog is 10m south, at an angle of depression of 65 degrees, and the firefighter is some distance east of the tree, at an angle of

8. ## english

1.which line from the poem "Briches" best develops it's nostalgic tone? A."And so I dream of going back to be." B."When I see birches bend to left and right" C."Where your face burns and tickles with the cobwebs" D."Soon the sun's warmth makes them shed

9. ## physics

A 2,200-kg car moving east at 10.0 m/s collides with a 3,000-kg car moving north. The cars stick together and move as a unit after the collision, at an angle of 35.0° north of east and at a speed of 5.16 m/s. Find the speed of the 3,000-kg car before the

10. ## math

the area of rectangular plot of land fenced all round is 2000 sq. yards and the total length of fencing 180 yards. find the length and width of plot.

11. ## english

1.Which literary device is used in the following sentence? According to that report, these special materials can bend "radar light, or other waves around an object like water flowing around a smooth rock in a stream." A.simile B.metaphor C.alliteration

12. ## Physis

The question: You are standing on a large sheet of frictionless ice and holding a large rock. In order to get off the ice, you throw the rock so it has velocity 11.9 m/s relative to the earth at an angle of 36.8∘ above the horizontal. If your mass is

13. ## Beacon house

How can the number 39 be divided into two parts in order that the sum of 2/3 of one part and 3/4 of the other part is 28?

14. ## Social Studies

How were the Canaanites different from the Israelites?

15. ## Mathematics

Solve for X: (x-6)log4=(3x)log2

16. ## Biology

The endocrine system a. affects only the reproductive system b. releases hormones into the bloodstream c. competes with the nervous system d. is made up primarily of glands with ducts I chose d. Is this correct? I want to make sure.

17. ## physics

A heavy box is pulled across a wooden floor with a rope. The rope forms an angle of 60.0o with the floor. A tension of 80.0N is maintained on the rope. What are the horizontal and vertical components of the force?

18. ## english

1.Choose the term that best describe the underlined phrase. (This is a battle) about which little is known. A.noun clause B.adverb clause C.adjective clause D.independent clause I think the answer is A because my two opinions is between A and D. please

19. ## english

1.A flashback is A.an indirect comparison of two unlike things. B.a major problem around which a story is built. C.the place and time during which a story takes place. D.a memory sequence that interrupts the chronological order of events 2.Identify the

20. ## maths

The half-life of lead is 22 years. How long will it take for a sample of this substance to decay to 80% of its original amount

21. ## Math

The monthly loan payment was calculated at 119 payments of \$348.33 plus a final payment of \$347.54. Loan Balance: \$30,000.00 Loan Interest Rate: 7.00% Monthly Loan Payment: \$348.33 Number of Payments: 120 Cumulative Payments: \$41,798.81 Total Interest

22. ## Math

Sketch a possible graph for a function where f(-2) exists, lim as x->-2 exists, f is not continuous at x=-2, and lim x->1 doesn't exist. How do I make this graph exist at x->-2 but still be discontinuous?

23. ## Physics

A 2-kg small block is dropped from rest. The spring has a constant k = 500N/m. If the entire track is frictionless except for the 1m between points B and C, where the coefficient of kinetic friction is 0.15, find he maximum compression of the spring.

24. ## Math

A contractor buys 14 yd of nylon carpet and 20 yd of wool carpet for \$1738. A second purchase, at the same prices, includes 16 yd of nylon carpet and 25 yd of wool carpet for \$2102. Find the cost per yard of the wool carpet.

25. ## physics

Starting from rest, a 10kg suitcase slides down a 3.00m long ramp inclined at 30 degrees from the floor. The coefficient of friction between the suitcase and the ramp is 0.35. 1) what net force is applied to the suitcase while it is on the ramp? 2)what is

26. ## Biology

What is the end result of the cell cycle and mitosis? Are daughter cells identical

27. ## Solid mensuration

The area of a segment of a circle is 330 square meter. If the longest chord of the segment is 57 meter,find its radius.

28. ## Math

A section in a stadium has 20 seats in the first row, 23 seats in the second row, increasing by 3 seats each row for a total of 38 rows. How many seats are in this section of the stadium? Please explain using words, numbers, and formulas.

29. ## Psychology

What are the main differences between criminal and non-criminal psychopaths?

30. ## physics

A golf ball of mass m = 0.12 kg is dropped from a height h. It interacts with the floor for t = 0.14 s, and applies a force of F = 10.5 N to the floor when it elastically collides with it.

31. ## algebra

School play tickets are \$5.00 for none students and \$3.00 for students. 937 ticket were sold for \$3943.00 How many student tickets were sold and how many none student tickets were sold ?

32. ## Physics

Starting from rest, a 10.0 Kg suitcase slides down a 3.00m long ramp inclined at 30.0 degrees from the floor. The coefficient of friction between the suitcase and ramp is .35. A: what net force is applied to suitcase while it is on the ramp? B: what is the

33. ## Biology

How do changes in DNA affect changes in adaptations? (I am of the assumption that changes in DNA spur the adaptations that take place--at least those through genetic mutation--and thus the adaptations that are most beneficial prevail. May I please have

34. ## French

Please check this sentence! -Quand tu dînes au restaurant,quelle repas préfères-tu manger?

36. ## PHYSICS( FRICTION)

A block of 1kg is kept on another block of 2kg in a horizontal surface. Coefficient of friction between two blocks is 0.4. The blocks are given velocities of 2m/s and 8m/s in same direction.The time when relative motion between them will stop =..???

37. ## Math

Select the answer that correctly orders the set of numbers from greatest to least. 15%, 1/8, 0.2, 0.09 A: 0.2, 15%, 1/8, 0.09 B:15%, 1/8, 0.2, 0.09 (I CHOOSE THIS) C:0.2, 1/8, 15%, 0.09 D:0.09, 1/8, 15%, 0.2

38. ## Math

Cristel is five years younger than Monica. After 4 years, the sum of their ages is 27. How old are they now?

39. ## Physics

A 0.01 kg Styrofoam ball is released from rest 2m above the floor. It reaches a speed of 3m/s the moment before it hits the floor. How much heat due to air resistance is generated during this process?

40. ## science

Tow masses are moving down a slope. One mass is traveling twice as fast as the other mass. How does the kinetic energy of one mass compare to the other?

41. ## Mathematics

Solve: 4^(x-6)=2^(3x) show all workings.

42. ## Algebra I

You have decided to try and convince your parents to let you get your own cell phone. After finding out that the flat monthly rate for unlimited minutes \$35.00, which you can afford, you offer to pay the cost yourself. However, just before you place your

43. ## Physics

Calculate the momentum of a bullet moving with a velocity of 1000m/s ,if it has a mass of 0.01kg

44. ## Physics

Light of wavelength 550 nm strikes a single slit of width 1.00 x 10-5 m that is 100.0 cm away from a screen. The screen is 36 cm wide, with the central maximum falling exactly at its centre. How many dark fringes in total will be seen on the screen ? Count

45. ## Physics

A projectile with a mass of 2.50 kg is shot horizontally from a height of 15.0 m above a flat surface. The projectile's initial speed is 22 m/s. 1.How much mechanical energy does the projectile have initially ? 2.How much work is done on the projectile by

46. ## math

The perimeter of a rectangular cattle enclosure is 400 feet. It is 40 feet longer than it is wide. Using a system of equations solve for the length and width of the enclosure using the substitution method.

47. ## math

Three times geoff age plus 3 is maryia age .maryia is 48 what is geoff age

48. ## math

Four years from now Emily will be as old as Cathy is now. Seven years ago, the sum of their ages was 22. Write a system of equations to model this situation and solve it using substitution to determine how old the girls are now.

49. ## Math

You plant a 4 foot maple tree that grows at a rate of 6 inches per year and a 2 foot birch tree grows at a rate of 8 inches per year . In how many years after planting will the two trees be the same height? How tall will each tree be?

50. ## Math

Betty is supposed to work the same number of hours each week. One week, she worked 42 hours the first week and 34 hours the second week, how many hours is Betty supposed to work?

51. ## accounting

Walk talk manufacture a cordless telephone system . At the beginning of the financial year ending 30 Nov 2009 , the firm budgeted to make and sell 50,000 units of its only product , the NOVA at the selling price of 30 \$ per unit . other budgeted

52. ## calculus

Let Y = 7x sin-1(2x)+^3 square root 1+4x2. Find Y'. I don't know how to do the square root part. I have done y'= (7x)' (Sin^-1(2x)) + (7x)(sin^-1)'+...... y'= 7 sin^-1 + (7x)sq(2x)'/square root (1-(2x))^2 + .....

53. ## English

Tyler said there/their/they’re are four kittens sleeping in a box under the porch. their

54. ## Chemistry

How many g of CaCl2 are required to prepare 0.250 L of a 0.200 M solution?

55. ## Math

Free fall equation is s=6.1t^2 ft, where t is in seconds. Assume a rock is dropped from a 100 ft cliff. Find speed of the rock at t=3.5 sec.

56. ## B/dar

A car of mass 800kg gose round a corner of radius 65m at a speed 10 m/s what size force is needed to achive this?

57. ## Physics

A fire hose ejects a stream of water at an angle of 35.8 ° above the horizontal. The water leaves the nozzle with a speed of 21.9 m/s. Assuming that the water behaves like a projectile, how far from a building should the fire hose be located to hit the

58. ## maths

A bag contains six blue and 4 red balls ,3 balls are drawn at random replacement what is expected no.of red balls that can be drawn?

59. ## English

Use their, there, they're 1. But _________ pleading wore me down, and it was raining, so I agreed. 2. _________ are only two blank tiles, and I got them both! 3. They kept trying to sneak _________ hands into the tile bag for new ones. 4. _________ is not

60. ## probability distribution

A bag contains Six blue and 4 red balls ,3 balls are drawn at random with replacement what is expected no of red balls that can be drawn?

61. ## Science

If a piece of paraffin wax has a mass of 900g and density of 9g/cm3, if the wax was melted to the liquid state approximately what would its volume be?? HELP PLEASE!!!

62. ## Math

graph is a piecewise; f(x)= 1) 2-2x-x^2, x=0. Determine whether graph has a tangent at x=o. If it does not, explain why not. I have no idea. When I plug in x=0, both equations give 2, but answer key says it does not exist. Explain?

63. ## Tilili

Let Vector "A" Cross With Vector "B" Equal To Ten,then Find (A+B) Cross With (A-B) ?

64. ## Math

Mary can run a mule in 11.2 minutes. How long will it take her to run 9.5 miles at that speed?

65. ## Calculus

A spherical balloon is being inflated so that, at the time when the radius is 5m, the radius is increasing at the rate of 0.15m/s. (A) Find the rate of increase of the volume at this time. (B) If the rate of increase of volume thereafter remains constant,

66. ## math

A health food store sells a mixture of raisins and roasted nuts. Raisins sell for \$4.00/kg and nuts sell for \$6.00/kg. How many kilograms of each should be mixed to make 40 kg of this snack worth \$4.75/kg?

67. ## Healthcare finance

Lansing Surgical Supplies Inc, sells on terms of 2/10, net 30. Gross sales for the year are 1.3 million and the collections department estimates that 30 percent of the customers pay on the tenth day and take discounts, 40 percent pay on the thirtieth day,

68. ## Physics

A baseball catcher moves his glove away from a 40.5 m/s fastball as he catches it. If the average force he exerts on the ball is 1.01 103 N, how far does the glove move? Assume constant deceleration of the ball, which has a mass of 0.144 kg. I don't know

69. ## math

the sum total of the ages of the son and his father is 58 years.if 7 years after the ratio of the ages of the son and father will be 1:3,then what is the age of son now?

70. ## Physics

A 810.0 kg pink grapefruit is accelerated horizontally from rest to velocity of 11.0 m/s in 5.00 seconds by horizontal force. How much work is done on the pink grapefruit assume no function?

72. ## Math

A truck uses 17 gallons of gasoline to travel 442 miles. Write this as a rate. I don't know how to find the rate?

73. ## stat

While technology or a​ t-distribution Distribution Table can be used to find the​ area, in this​ problem, technology will be used. Find the​ P-value associated with t t0equals=1.34 and 19 degrees of​ freedom, rounding to three decimal places. Can

A projectile propelled straight upward from the ground is modeled by the function d(t)=-16t^2+304t. a) At what time does the projectile reach maximum height? b) What is the maximum height? c) At what times is the projectile more than 500 feet above the

75. ## Biology

As you go up the energy pyramid __% of the energy is loss at each level and only __% remainds. In what form is this energy lost as? ___ First blank 10%

76. ## statistics

A shipment of 50 parts contains 12 defective parts. Suppose 3 parts are selected at random, without replacement, from the shipment. What is the probability that all 3 parts are defective?

77. ## Physics

A missile of mass 1.20 102 kg is fired from a plane of mass 5.10 103 kg initially moving at a speed of 3.35 102 m/s. If the speed of the missile relative to the plane is 1.21 103 m/s, what is the final velocity of the plane? HELP I have no idea how to do

78. ## Physics

A 22kg child on a 1.75m long swing is released from rest when the swing supports make an angle of 35 degrees with the vertical. 1.What is the child's maximum potential energy? 2.Disregarding friction, find the child's theoretical speed at the lowest point.

79. ## stat

A poll of 1000 registered voters reveals that 480 of the voters surveyed prefer the Democratic candidate for the presidency. At the 0.05 level of significance, do the data provide sufficient evidence to conclude that the percentage of voters who prefer the

80. ## Physics

A tennis ball initially moves with a velocity of 27.0 m/s horizontally to the right. A tennis racket strikes the ball, giving it a velocity of 27.0 m/s to the left. Treat the collision as elastic and the ball and racket as particles of mass 0.0580 kg and

81. ## Math

1. Use MATLAB Optimization Tool to solve the following problem: minimize [2x1^2+2x1x2+x2^2-10x1-10x2] subject to [x1^2+x2^2≤500] and [5x1-x2 ≤ -4] . 2. Please hand-check all the Kuhn-Tucker conditions for your answer.

82. ## Physics Help

A projectile is fired at an upward angle of 60 degrees with a speed of 100m/s. It lands on a plateau 150m higher. What is the projectile's speed the moment before it strikes the plateau? I'm thinking to just use the kinematic equation Vf^2= Vi^2 + 2aΔy.

83. ## Discrete Mathematics. Need Help

Let A be the set of all ordered pairs of positive integers and R be the relation defined on A where (a,b)R(c,d) means that b-a=d-c. a)Show that R is an equivalence relation. b)Find [(3, 5)] and [(7, 1)].

84. ## History

how long can the treasurer of the united states serve?

85. ## Structures

A wood column is 5.5 in. square in cross section and 12 ft long. Its modulus of elasticity is 1.3 × 106 psi. How much will the column shorten under a compressive load of 36,000 lb?

86. ## Chem

would 0.360 mol of hydrochloric acid be sufficient to react with 10.0 g ferric oxide?

87. ## heath

What is a strain?

88. ## burke county middle school

A deposit of 7,500 earns 3,900 over a period of 8 years. What is the simple interest rate?

89. ## stat

A poll of 1000 registered voters reveals that 480 of the voters surveyed prefer the Democratic candidate for the presidency. At the 0.05 level of significance, do the data provide sufficient evidence to conclude that the percentage of voters who prefer the

90. ## Math

HI!! Um could someone help me with this problem... "Write 300/100 as a percent... I got 3% but Idk if that is right.., PLEASE HELP ME!!!

91. ## chemistry

If a solution of barium hydroxide contains 9.1x1025 hydroxide ions, how many grams of barium hydroxide were originally dissolved?

92. ## math

. A deposit of 7,500 earns 3,900 over a period of 8 years. What is thw simple interest rate?

93. ## Children Development

The name and contact information of a translation service for families whose home language is other than English as well a service that provides American Sign Language Translation? I need help find a website for this two things?

94. ## Spanish

____ las 8:00 de la noche cuando el espectáculo A. Fueron/empezaba B.Era/empezó C.Eran/empieza D.Eran/empezó D?

95. ## Physic

Two gliders with masses m1 = 0.200 kg and m2 = 0.300 kg are held stationary on an air-track with compressed spring in between. The gliders are then released and the spring pushes them apart. If m1 moves at 3.00 m/s right after it is released, nd the

96. ## physics

Jake needs to catch 1 10 pound fish to last 5 days. He catches 2 3.33 pound fish, 1 2.11 pound, and 1 1 pound fish. How long will he survive with that amount of food?

97. ## Math

Which pair of ratios can form a true proportion? A: 7/4,21/12 (I CHOOSE THIS) B: 6/3,5/6 C: 7/10,6/7 D: 3/5,7/12 Pls help

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98. ## Math

The length of a dog on a scale drawing is 9 cm. if the scale is 1 cm:6 cm, what is the actual length of the dog? A: 15cm B: 30 cm C: 54 cm ( I CHOOSE THIS) D: 108 cm

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99. ## Math

Which of the following are equivalent to 85%? Choose all that apply. A: 0.085 B: 0.85 (I CHOOSE THIS) C: 85/100(I CHOOSE THIS) D: 19/20

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100. ## physics

the height of the mercury in the glass tube thermometer when in melting ice and then steam are 3 cm and 18 cm respectively

101. ## Algebra

Solve the following set of equations using elimination. -3x+5y=13 3x+2y=1 My answer: x=-0.5 y=1.25 Am I right?

102. ## Physics

Bill is moving a crate of mass 35 kg up a ramp that forms a 25 degree angle with the horizontal to a height of 5 m. A) If the ramp is frictionless, how much work must Bill do in pushing the crate to the top? B) How much work does gravity do as Bill pushes

103. ## cda

I need help with this? Summaries of the legal requirements in your stage regarding child abuse and neglect include contact information for the appropriate agency in your state and mandatory reporting guidelines? I live indiana.

104. ## Math

Least to greatest 1/8,0.78,15%,1/20

105. ## Physics

4) if the speed limit on highways changed from 100 km/hr to 110 km /hr,how much more distance would a car need to speed: A) on dry roads*0.06 B) on wet roads *0.10 C) on icy roads *0.15 *Note convert from km/hr to m/s ,multiply by 0.278 Or m/s to km/hr

106. ## Inequalities

Write two different inequalities that you can solve by adding 5 and multiplying by -3.

107. ## math

If someone spent 1/3 of their money at the first store and then 1/2 of their money at a second store. How much money did they start with if they have \$9.00 left?

108. ## Chemistry

How many calcium atoms are in a formula unit of calcium hydrogen carbonate? 1. 1 2. 2 3. 4 4. 3 5. 5

109. ## science

If the temperature of 0.20 kg of gold, which has a specific heat of 130 J/kg • °C, increases by 25°C, how much energy has been transferred to the gold by heat?

110. ## geet

in 1996, sharon that spent 189 days in space that is longer than another astronaut. how many weeks was she in the space .

111. ## Physics

A 600 N skydiver in free fall is accelerating at -7.6 m/s^2 rather than -9.8 m/s^2 because of the force of air resistance. How much drag force is acting on the skydiver? a)58.2 b)65.3 c)61.4 d)40.2 I use the equation Σ(F)vertical-ma=0 To find m I did:

112. ## math

on office equipment sales representative earns a weekly salary and commission on his sales. one week his total compensation on sales of \$7000 was \$700, the next week his total compensation on sales of \$8000 was \$740, find the weekly salary and commission

113. ## Physics (angle Vector)

You have a boat that is capable of moving at 11.8 m/s through still water. You wish to cross a river that flows due south at 5.4 m/s. At what numerical compass heading must you pilot your boat so that you will reach a destination that is due east of your

114. ## Biology

3grams of ammonium chloride has been added to 20mL of water. The initial temperature of the solutionis 18.0 degrees, and once the ammonium is added to the water, the temperature declines to 11 degrees. Given the following information, calculate the

115. ## Physics

If a spring gains 0.400 joules of potential energy as it is stretched 0.0375 meters from its equilibrium, what is the spring's force constant?

116. ## Math

solve the exponential function for x using base 5 logarithms. 5^x+4=125^1-3x

117. ## Math

Consider a large water tank: If 3900L occupies 3/4 of the total capacity of the tank, how much water will the tank hold when it is full?

118. ## FINAN & QUANTITATIVE LITERACY

You currently drive 288 miles per week in a car that gets 24 miles per gallon of gas. You are considering buying a new fuel-efficient car for \$15,000 (after trade-in on your current car) that gets 48 miles per gallon. Insurance premiums for the new and old

119. ## St.martins

Olaf keeps running around the track unil he has run 0.9km in total. The track is 150m long. How many times does he run around the track?

120. ## CHEMISTRY

what is the percent by mass of solution (d =1,3g/ml) of urea ((NH2)2CO) with molarity 8,4mol/l?