1. PHYSICS

A thundercloud has an electric charge of 43.2 C near the top of the cloud and -38.7 C near the bottom of the cloud. The magnitude of the electric force between these two charges is 3.95 x 106 N. What is the average separation between these charges? I'm

2. physics

calculate the period and frequency of a 3.500 m long pendulum at the following locations: a) the north pole, where acceleration due to gravity is 9.832 m/s^2 b) chicago, where acceleration due to gravity is 9.803 m/s^2 c) jakarta, indonesia, where

3. Physics

A 30.0 ball rolls around a 50.0 -diameter L-shaped track, shown in the figure, at 60.0 . What is the magnitude of the net force that the track exerts on the ball? Rolling friction can be neglected.

4. ap chem

The heat of combustion of propane is -2,220.1 kJ/mol calculate the heat of formation, delta Hf, of propane given that delta Hf of H20= -285.3 kJ/mol and delta Hf of CO2 = -393.5 kJ/mol

5. Physics

A child is sliding on a sled at 1.8 to the right. You stop the sled by pushing on it for 0.70 in a direction opposite to its motion.If the mass of the child and sled is 36 , what average force do you need to apply to stop the sled?

6. trig

Bob throws a ball straight up with an initial speed of 50 feet per second from a height of 6 feet. (a) Find parametric equations that describe the motion of the ball as a function of time. (Do this on paper. Your instructor may ask you to turn in this

7. Sound and music

If the fundamental frequency for a 60-cm long guitar string is 500 Hz, what is the speed of the traveling waves?

The reaction of CO(g) + NO(g) is second-order in NO2 and zero-order in CO at temperatures less than 500K. (a) Write the rate law for the reaction. (b) How will the reaction rate change if the NO2 concentration is halved? (c) How will the reaction rate

9. math

A British company is sending you measurements for a table to build in your factory. The table top must be 50 cm × 75 cm. Your machine calibrates in inches. Find the size of the table in inches. (1 cm = .39 in)

A 73.5 kg person sits on a 3.20 kg chair. Each leg of the chair makes contact with the floor in a circle that is 1.74 cm in diameter. Calculate the pressure exerted on the floor by each leg of the chair, assuming the weight is evenly distributed.

11. Physics

1. It takes 190 kJ of work to accelerate a car from 21.0 m/s to 29.0 m/s. What is the car's mass? 2. A 32-kg girl is bouncing on a trampoline. During a certain interval after she leaves the surface of the trampoline, her kinetic energy decreases to 205 J

12. physics

If an elevator with mass of 4850kg is designed to have a maximum acceleration of .068g (g is gravity acceleration). What are the maximum and minimum forces the motor should exert?

13. Math--Statistics

I have a couple of questions that need review--I've answered them, but I'm not sure if I'm correct. 1.)Suppose you interview 10 randomly selected workers and ask how many miles they commute to work. You'll compute the sample mean commute distance. Now

14. physics

A 55-kg packing crate is pulled with constant speed across a rough floor with a rope that is at an angle of 44.7 degrees above the horizontal. If the tension in the rope is 155 N, how much work is done on the crate to move it 9.0 m? *looking for W=__J

15. Writing

I am trying to cite the novella Aura for my works cited page. Fuentes, Carlos. Aura. Bilingual Edition, New York, 1965 Is this correct?

16. Calculus

A hot-air balloon is 180 ft above the ground when a motorcycle passes directly beneath it (travelling in a straight line on a horizontal road) going at a constant speed of 60 ft/s. If the balloon is rising vertically at a rate of 15 ft/s, what is the rate

17. Math

An NFL punter at the 15-yard line kicks a football with an initial velocity of 95 feet per second at an angle of elevation of 28 degrees. Let (t) be the elapsed time since the football is kicked. a. Write the parametric equations of this problem. b. With

18. Early childhood

School-age children generally develop writing skills in which sequence? A.Expressive writing,expository writing,story B.Exposity writing,story writing,expressive writing. C.Expressive writing,story writing,expository. Story writing,expository

19. Physics

A small plane tows a glider at constant speed and altitude. If the plane does 2.00X10^5 J of work to tow the glider 165 m and the tension in the tow rope is 2660 N, what is the angle between the tow rope and the horizontal?

20. history

All of the following statements are true about the Works Progress Administration EXCEPT: A.despite its good intentions, it provided few jobs for Americans B.the organization developed work projects for artists, musicians, and writers. C.it laid much of the

21. physics

Engineers are trying to create artificial "gravity" in a ringshaped space station by spinning it like a centrifuge. The ring is 120 m in radius. How quickly must the space station turn in order to give the astronauts inside it apparent weights equal to

22. Writing

I am writing a paper on the novella Aura by Carlos Fuentes and so far I have a few paragraphs. I was just wondering if I were to post what I have so far would someone be able to proread it for me? I am mostly worried about grammatical errors.

23. English

I have to write an argumentative paper on the topic: Recent changes to Georgia's HOPE scholarship program. To start off I wanted to conduct some research on the topic, but I only want to use good secondary sources from academic websites or something like

24. Physics

A 1900 car starts from rest and drives around a flat 50--diameter circular track. The forward force provided by the car's drive wheels is a constant 1300 . A) What is the magnitude of the car's acceleration at ? B) What is the direction of the car's

25. Hot-air balloon

A hot-air balloon is 180 ft above the ground when a motorcycle passes directly beneath it (travelling in a straight line on a horizontal road) going at a constant speed of 60 ft/s. If the balloon is rising vertically at a rate of 15 ft/s, what is the rate

26. Maths

Two cyclists depart from the same point. One travels due East at 18km/hr while the other travels North-West at 20km/hr. How long will it be before they are 80km apart?

27. physics

In a long jump, an athlete leaves the ground with an initial angular momentum that tends to rotate his body forward, threatening to ruin his landing. To counter this tendency, he rotates his outstretched arms to "take up" the angular momentum. In 0.393 s,

28. Math

A football field, including the end zones, is 360 feet long and 160 feet wide. How many square yards of artificial grass would be needed to cover the entire field?

29. Environmental engineering

If the BOD5 of a waste is 220 mg/L and the ultimate BOD is 320 mg/L, what is the rate constant?

30. Physics

A raindrop (mass=1.00g) is travelling at a speed of 40m/s when it hits the surface of 100g of water contained in a drinking glass. What is the change in temperature of the water in the glass if we assume that i)all the kinetic energy of the raindrop is

31. math

Find the area of the region bounded by the graphs x=sqrt 2sin2y ; x=0

32. physics

When you put water in a kitchen blender, it begins to travel in a 7-cm-radius circle at a speed of 1 m/s. How quickly is the water accelerating?

33. chemistry

What are the concentrations of H3O+ and OH- and what is the pH of a 0.15 M solution of Na2CO3 (at 25 °C).

34. Calculus

-e^[(-(x-a)^2)/b] b>0; local max at x=7 and points of inflection are x=5 and x=9. Find the formula... y=

35. chemistry

At 22.0 degrees Celsius , a student collects H2 gas in a gas collecting tube. The barometric pressure is 755.2mm Hg and the water levels inside and outside the tube are exactly equal. What is the total gas pressure in the gas collecting tube?

36. Chemistry

A sample of O2(g) is saturated with water vapor at 27 C. The total pressure of the mixture is 772 torr, and the vapor pressure of water is 26.7 torr at 27 C. What is the partial pressure of the O2?

37. physics

You raise a bucket of water from the bottom of a deep well. If your power output is 128 W, and the mass of the bucket and the water in it is 6.00 kg, with what speed can you raise the bucket? Ignore the weight of the rope.

38. chemistry

Aluminum Chloride has a universal indicator color of red and the Ph of 4.0 b) Sodium Carbonate has a universal indicator color of violet and the Ph of 9.5. c) Ammonium Acetate has a universal indicator color of green and the Ph of 7.5 For the following

39. math

The first three terms of a geometric sequence are 2, 10, 50, and the 8th term has a value of 156,250. What is the value of the 7th term?

40. Math

A circular swimming pool is 4 feet deep and has a diameter of 15 feet. If it takes 7.5 gallons of water to fill one cubic foot, to the nearest whole number, how many gallons are needed to fill this swimming pool. Diameter = 2r A = π r^2 V = 4A W = 7.5V

41. chemistry

How many milliliters of 3.0 M hydrochloric acid are i required to prepare 500 milliliter of 1.0 M Hydrochloric solution

42. chemistry

How many atoms are contained in 8.8 g of CO2?

43. physics

A 747 jetliner lands and begins to slow to a stop as it moves along the runway. If its mass is 3.50x^5 kg. Its speed is 27.0 m/s, and the net braking force is 4.30x10^5 N. (a)what is its speed 7.50 s later? (b)how far has it traveled in this time?

44. Physics

Early one October, you go to a pumpkin patch to select your Halloween pumpkin. You lift the 2.8 kg pumpkin to a height of 1.4 m, then carry it 50.0 m (on level ground) to the check-out stand. Calculate the work you do on the pumpkin as you lift it from the

45. math

Find all the two digit prime numbers neither of whose digits are prime. Someone helped me yesterday but I do not understand.

46. math

for a set of three elements find the number of different subsets of 2 elements.use row 3 of pascals triangle

47. geometry

The sum of the lengths of the sides of triangle ABC is 25 in. The lengths of sides AB and BC are 9 inches and 8 inches. Find the length of side AC and classify the triangle.

48. chemistry

You add thiocynanate ions to a solution The molarity of silver ion is 0.1M initially. Calculate the max concentration of SCN- ion that exists in the solution before AgSCN beings to precipitate? ?

49. Chemistry

Write a balanced chemical equation (molecular equation). Write a total ionic equation. write a net ionic equation. (NH4)2 SO4(aq)+Na2CO3(aq) -->

50. Algebra

Explain why the addition method might be preferred over the substitution method for solving the system 2x-3y=5 5x+2y=6

51. Chemistry

What mass of silver chloride can be prepared by the reaction of 160.0 mL of 0.10 M silver nitrate with 120.0 mL of 0.19 M calcium chloride?

52. physics

A 1.1 kg block is held against a spring of force constant 2.0×10^4 N/m, compressing it a distance of 0.20 m. How fast is the block moving after it is released and the spring pushes it away? v=____m/s

53. Comm 155

Could you please check these sentences and tell me if they make sense. Write five sentences in which you address changes in your writing. 1. With practice, I have gotten better at grammar and punctuation. 2. Working with a study group has made my sentence

54. Calculus

Let y(x)=ln(cosh(x)+ sqrt(cosh^2(x)−1)) Find the derivative Dxy= I don't know what to do with this...

55. Environmental engineering

Ottawa’s anaerobic digester produces 13 m^3/day of sludge with a suspended solids concentration of 7.8%. What volume of sludge must they dispose of each year if their sand drying beds yield a solids concentration of 35%.

56. english

Which is the most effective coordinating conjuction to join the following independent clause? Miriam wants a digital picture frame, She cannot afford one just now should i use for, so, and ,or but

57. Physics

A dock worker loading crates on a ship finds that a 24 kg crate, initially at rest on a horizontal surface, requires a 64 N horizontal force to set it in motion. However, after the crate is in motion, a horizontal force of 46 N is required to keep it

58. physics

A new record for running the stairs of the Empire State Building was set on February 3, 2003. The 86 flights, with a total of 1576 steps, was run in 9 minutes and 33 seconds. If the height gain of each step was 0.20 m, and the mass of the runner was 68 kg,

59. Insurance Forms

I need help with a few questions. Could you let me know if I'm going in the right direction. 1- CHAMPVA would be considered a primary payer for a patient who has ______ coverage. A- Medicaid B- fee-for-service C- Medicare D- SSI Answer: A 2- You should

60. Physics

In a skating stunt known as "crack-the-whip," a number of skaters hold hands and form a straight line. They try to skate so that the line rotates about the skater at one end, who acts as the pivot. The skater farthest out has a mass of 73.0 kg and is 7.70

61. Physics

Marcus and Santa are sliding down a snowy hill that is 13.3 m high. On the hill itself friction and air resistance can be ignored. At the bottom of hill the sled hits a long patch of rough snow that slows the sled down by exerting an average force of 170

62. maths

A party of bush walkers have an average speed of 50km/minute and walk for 4 hours on a bearing of 231°T. they then walk for 6(1)/(3) hours on a bearing of 117°T. Find a.How far are they from bas e camp? b. The bearing they must travel along to get to

63. algebra

If my equation that I wrote does it matter how it is written. Does it matter if I write it' \$200+\$50h=c or c=\$200+\$50h or c=\$50h+200

A) If x^2+y^3−xy^2=5, find dy/dx in terms of x and y. dy/dx=________ B) Using your answer for dy/dx, fill in the following table of approximate y-values of points on the curve near x=1 y=2. 0.96 ______ 0.98 ______ 1.02 ______ 1.04 ______ C) Finally, find

Piston 1 has a diameter of 0.524cm Piston 2 has a diameter of 5.64 cm. In the absence of friction, determine the force required on piston 1 necessary to support an object, m, with weight 1072 N. (Neglect the height difference between the bottom of the two

66. history

11. A key technological development that began around 500 B.C.E. in sub-Saharan Africa was

67. Statistics

I'm stumped on this question. A teacher informs her history class that a test is very difficult, but the grades would be curved. Scores for the test are normally distributed with a mean of 25 and a standard deviation of 5. If the grades are curved

68. math

how do I express these decimals as fraction in lowest terms? -9.8 and 1.6666666

69. english

Write a 150–200 word paragraph about the most helpful information you have learned from your other second-block course on how to make sound financial decisions. Underline your topic sentence and bold your clincher sentence.

70. Math--Statistics

Two questions that I'm unsure of are below: 1). The variability of a statistic is described by: a) the spread of its sampling distribution. b) the amount of bias present c) the vagueness in the wording of the question used to collect the sample data d) the

71. College Algebra

You have 100yds. of fencing to enclose a rectangular area. Find the dimensions which maximize the area. What is the maximum area? I know that A=L times W. I know that 100 = 2L+2w Subtract 2L from both sides: 100-2L=2W Divide by two: 50-L=W Substitute in

72. chemistry

I need assistance with this question please. "The equation of the line for a graph of voltage (Ecell) versus log[Cu2+] was y= -0.0166x - 0.0082. The voltage of a solution with an unknown [Cu2+] was measured against the same reference cell, under the same

73. chemistry

A certain voltaic cell has a standard cell voltage of 1.22 V, and 3 electrons are transferred in the overall cell reaction. What is the value of the thermodynamic equilibrium constant for this cell reaction at 298K?

74. Inorganic chemistry

predict the product of the ff.reactions: C3H6 + HF C3H6 + H2O C3H6 + Cl2

75. chemistry

Calculate the pH of a solution resulting from the addition of 10.0 mL of 0.10 M NaOH to 50.0 mL of 0.10 M benzoic acid (Ka = 6.5 x 10 -5

76. History

The results of the 1912 election prove that Americans were ready for change and reform across the board. Each candidate offered their own view on how changes should be implemented and which issues needed change, ultimately the voters showed they wanted an

77. sound and music

How long is an open organ pipe with a fundamental frequency of 493.88 Hz?

78. biology

If an elodea leave is place in pure distilled water, what will happen? plus will this be isotonic or hypertonic or hypotonic solution.

79. Spanish

49. Mi madre hace ____ con tortillas, carne de res, queso y tomates. a. el guacamole b. las quesadillas c. los tacos d. el flan sabroso C? 51. No tengo tiempo para arreglar mi cuarto. Voy a poner la ropa ________ de la cama. Nadie puede verla. a. encima b.

80. geometry

A ramp is built by putting a triangle on top of a trapezoid. How long is the ramp?

81. Physical Science

If a vehicle circled Earth at a distance equal to the Earth-Moon distance, how long would it take to make a complete orbit?

82. chemistry

Which of the following is true for the gas phase reaction shown below? 4NH3(g) + 5O2(g) ¨ 4NO(g) + 6H2O(g), ƒ¢H = -0.905 kJ

83. English - Native speakers

Hello! When you are writing the unknown words f.e. on the board can you write the following or is something else correct (I am referring to articles): an aim- a counter-revolution- a supporter- a square- a mayor- a green area- a pedestrian zone- So should

84. physics

A mass was dropped from a height of 20m. (a) find its speed at impact. (b) what can you say about the initial GPE of the mass and the KE of the mass just as it hits the ground?

85. chemistry

Azomethane, CH3NNCH3, is not a stable compound, and once generated, it decomposes. The rate of decomposition was measured by monitoring the partial pressure of azomethane, in torr. Time (min) 0, 15, 30, 48, 75 Pressure(torr)36.2, 30, 24.9,19.3, 13.1

86. chemistry

Fe3+ is added to excess Ag+ prior to titration with KSCN. When all the excess Ag+ has reacted, the red complex of Fe(SCN)2+ forms. This red complex is visible when the [SCN-] is about 2x10^-4M. at this pt. >99% (but not all) of the Ag+ has precipitated.

87. Chemistry

SO3 + H2O = H2SO4 If you react 34 g of water and have excess SO3, how much H2SO4 would you theoretically produce?

88. calculus

A rocker arises from its launching pad with a velocity given. By 0.1 h m/s ,where h m is the height reached by the rocket at that time.the rocket is obserrvved from 2000 m away from the launch pad.at. What rate is the distance of the roocket from observer

89. Physics

A clerk moves a box of cans down an aisle by pulling on a strap attached to the box. The clerk pulls with a force of 174.0 N at an angle of 27.0 degrees with the horizontal. The box has a mass of 39.0 kg, and the coefficient of kinetic friction between the

90. Math

A right square pyramid’s base has edges measuring 20 feet each. If the pyramid’s height is 27 feet, what is its volume, in cubic feet?* *Could you include an explanation as well?

91. Math

The surface area of a particular cube is 600 square inches. When the edges of the cube are doubled in length, what is the volume of the new cube, in cubic inches?

92. chemistry

what mass in grams of sodium nitrate is needed to make 85.o ml of a 0.2500 m solution

93. algebra

A man wants to build a rectangular pen in which to keep his dog. If he uses one side of his barn, what is the maximum area that he can enclose with 80 meter of fencing?

The dimensions of a rectangle are such that its length is 3 in. more than its width. If the length were doubled and if the width were decreased by 1in., the area would be increased by 150 in.^2. What are the length and width of the rectangle?

95. algebra

When priced at 300 pesos each, a toy has an annual sales of 4000 units. The manufacturer estimates that each 10 pesos increase per unit will decrease the sales by 100 units. Find the unit price that will maximize the total revenue.

96. chemistry

what is the concentration in percent by volume of 25.0 mL of rubbing alcohol (C3H7OH) diluted to a volume of 200.0 mL with water? I got 12.5% am i correct??

97. Algebra 2

The question says to make a statement about Log A over B & Log B over A & prove it. How do I answer?

98. Physics

The four tires of an automobile are inflated to a gauge pressure of 1.84E+5 Pa. Each tire has an area of 0.0237 m2 in contact with the ground. Determine the weight of the automobile.

99. Math

If the diameter of a wheel is 10 inches. What is the radius and how would I find its circumference. Thanks I do understand that the radius is twice the circumference.

100. math

how do you write out visual patterns

101. Spanish

40. A Luisa y a Mario _________ las películas de ciencia ficción. a. les fascinaron b. me fascinan c. te fascinaron d. nos fascina A or D? Not sure.. 41. Tenemos sueño. ____ aburre ese programa de detectives. a. Les b. Me c. Nos d. Le Not sure. 42.

102. chemistry

What reagent converts sodiumethanoate to methane?

103. Physics

A rocket-powered hockey puck has a thrust of 2.40 and a total mass of 1.40 . It is released from rest on a frictionless table, 2.90 from the edge of a 1.80 drop. The front of the rocket is pointed directly toward the edge. How far from the table does the

104. Converting Roman numerals to arabic Numbers

1) CCXIX C = 100 X = 10 I = 1 because there are 2 C's I added them together and I got 200 because there are 2 X's I added them together and got 20 because there is 1 I that equaled 1 So I added 200 + 20 + 1 = 221 which is my final answer But according to

105. chemistry

what are the products of electrolysis of the following solutions? A. potassium iodide B. nickel sulphate C. magnesium chloride

106. Evolutionary Science (stem-lineage?)

I'm reading this article and it says the following: "the PRL regulatory gene HoxA-11 experienced a period of strong positive selection in the stem-lineage of eutharian mammals" What does this mean? I'm not to sure what they mean when they're referring to

107. algebra 2

Hat sizes are determined by measuring the circumference of one's head in either inches or centimeters. Use ratio and Proportion to complete the following table. Hat Size: Hat size: 7 1/4, 7 1/8 Head circum to nearest 1/5 22/45. Head circum to the nearest

108. Word Problem

A grander want to create a triangular garden in the shape of a right triangle with shortest side length x-6y ft. and the middle length side x + 6y ft. what is an algebraic expression for the area of the garden? Be sure to multiply this out and express in

109. chemistry

calculate the volume of water in mL needed to make 75% solution containing 50g of CaCl2

y=5x+3

111. Math

What operation is used to change a fraction in simplest form to an equivalent fraction? What operation is used to change a fraction to simplest form?

112. Calculus

Find dy/dx in terms of x and y if xlny+y^6= (9)lnx

113. Chemistry

what would be the molarity of a KOH solution if 15 mL of the solution required 22.3 mL of 0.085 M HCl to react with the base?

114. Calculus

A 17 foot ladder is leaning on a 6 foot fence. The base of the ladder is being pulled away from the fence at the rate of 5 feet/minute. How fast is the top of the ladder approaching the ground when the base is 6 from the fence? [Note: The ladder is

115. chem

20 ml of 0.1 M Acetic acid and 25 ml of 0.1 M Sodium Acetate are mixed together. then 5ml of 0.1 M of NaOH is added. Find the Ph before the addition of NaOH and after the addition of NaOH??

116. anonymous

1.) an account invested in a month market fund grew from \$67,081.20 to \$67,359.39 in a month. What was the interest rate, to the nearest tenth? 2.)you are due a tax refund of \$760. your tax preparer offers you a no-interest loan to be repaid by your refund

asked by math i have a few questions.hepl pls ty
117. math

if sam earned \$4,000 and gave 1/5 wawy and invested 1/2 of the remaining amount how much did he have left?

118. Calculus

Find dy/dx in terms of x and y if xlny+y^6= (9)lnx

119. Organic Chemistry

How many grams of 2-propanol are expected from the complete reaction of 111 g of propene?

Let y(x)=ln(cosh(x)+ sqrt(cosh^2(x)−1)) Find the derivative Dxy= I don't know what to do with this...

121. science

what kind of heat transfer causes earth's major wind patterns

122. physics

Your sonic range finder measures the distance to a nearby building at 20m. The range finder is calibrated for sound traveling 343 m/s, but on this very cold day the speed of sound is only 309 m/s. How far away is the building?

123. math

Eighty students participate in an after school enrichment program consisting of science and creative writing. If 540 of the students take science and 45 take creative writing, how many take both subjects?

124. physics

10. A 5 meter length of wire has a charge density of 3 x 10-3 C/m. What is the electric field strength E at an axial distance of 0.25 meters from the wire?

125. algebra

I have a problem with break even analysis? the question is I'm trying to find the cost between 2 businesses to care for my lawn. The one company has an initial fee of \$200+\$50an hour for labor cost and the second company has an initial cost of \$300+\$25an

126. sociology

How can the three sociological perspectives (e.g., social functionalism, social conflict, and symbolic interaction) be used to conceptually understand multiculturalism?

127. chemistry

Aluminum Chloride has a universal indicator color of red and the Ph of 4.0 b) Sodium Carbonate has a universal indicator color of violet and the Ph of 9.5. c) Ammonium Acetate has a universal indicator color of green and the Ph of 7.5 ....For the following

128. math

The quotient of a number and -2\3 is -9\10. What is the number?

129. engineering mathematic

give that z = f(x,y). use partial derivatives to find δz/δx and δz/δy for xe^xz + z(xy+1)^3-sin x cos^2y=xy/z present your final answer in the simplest form.. please solve this problem....tq

130. calculus

find the nth derivative of 2/(x+1)

131. Science

a scooter goes from a velocity of 6.9 m/s to a velocity of 4.8 m/s in a time of 5.1 seconds. what is the acceleration of the scooter

132. Spanish

57. Sé poco de estos platos españoles en el menu. Voy a pedir _____. a. la especialidad de la casa b. el plato principal c. a la carta d. por la carne de res A? C? Not sure.. 58. Ese camarero siempre me sirve _______. a. una vez b. en seguida c. muchas

133. algebra 2

It takes 2 hr for 8 cooks to prepare the food for a wedding rehearsonal. How long would it take 5 cooks? Thank you

134. English

Hello! Can you write the word Goodbye like this and like this Good bye? What about Goodnight or Good night?

135. calculus

find the nth derivative of 2/(x+1)

136. Algebra

12(74y - (6+5Y - 8Z) = Please show work

137. science

What fossil fuel is pumped through underground pipes and what is the name of the energy resource from underground that turns to ash as it burns.

138. HELP! URGENT! (geometry)

Helen stands 66 m away from the base of the tree. If the line of sight makes an angle of 30 with the top of the tree with respect to the horizon. What is the height (h) of the tree?

139. Chemistry

SO3 + H2O = H2SO4 If you react 34 g of water and have excess SO3, how much H2SO4 would you theoretically produce

140. maths

a leisure centre recordsthe number of visitors each week in one particular week there were 1372 visitoros the following week the number of visitors was 900 to the nearest hundred! what is the smallest number of visitors that could have visited the leisure

141. Physics

Can someone please help me? The brakes of a truck cause it to slow down by applying a retarding force of 2.60 103 N to the truck over a distance of 930 m. What is the magnitude of the work done by this force on the truck? Is the work positive or negative?

142. calculus

how do i use a taylor series centered at some x value to approximate the value of the function centered at a different x value? for example, if im given some taylor series centered at 5 of f(x) but i want to find f(3), how do i do this? (btw that example

143. Physics

A water tower is filled with fresh water to a depth of 6.38 m. What is the water pressure at a depth of 3.96 m?

144. chemistry

a) Aluminum Chloride has a universal indicator color of red and the Ph of 4.0 b) Sodium Carbonate has a universal indicator color of violet and the Ph of 9.5. c) Ammonium Acetate has a universal indicator color of green and the Ph of 7.5 For the following

145. math

how many differnt squares are in each figure ? count the small squares first ,then move up to the next size ,and so on .Record the total number of squares below each figure and look for a pattern?

146. maths

which one of these numbers 9,15,25,45,50,64,100,125,175 has a cube root of 5

147. History

The results of the 1912 election prove that Americans were ready for change and reform across the board. Each candidate offered their own view on how changes should be implemented and which issues needed change, ultimately the voters showed they wanted an

148. algebra

The area of the top of a triangular corner desk must be at least 7 sq. ft. If the base of the triangular desk top needs to be four feet, what should the height be?

149. math

The larger circle has a radius that is 18 inches longer than the smaller circle. The larger circle has a circumference that is A pi feet larger then the smaller circle. find the value of a.

150. Chemistry

Are binary compounds ionic or covalent? If they are covalent? If they are covalent, I thought they don't form bonds that way, since they share electrons.

151. pre Algebrs

7 is 175% of what number

152. world history

Many early historians tended to look at the past in terms of A. Random cycles B. Continuities and discontinuities C. Innovation and change D. Progress and decline I think D but I'm not sure. Please help!

153. math

178 divided by 9.6 =

154. Science

How do the bacteria within a deepsea tubeworm( residing near hydrothermal vents) affect the environment around them?

155. social studies

if a person's family grew wheat and corn and they needed cloth for a new shirt.what might have the family barted to get the cloth that they needed?

156. physics

A certain car is capable of accelerating at a uniform rate of 0.82 m/s2. What is the magnitude of the car’s displace- ment as it accelerates uniformly from a speed of 85 km/h to one of 95 km/h? Answer in units of m.

157. physics

Two Astronauts A and B are working in the space shuttle in the space.Suddenly the hammer falls from the hands of astranaut in space. who will hear most sound,Astranonaut A or B .and why?

158. Mechanical Engineering Sci.

Use the parallelogram of forces method to determine the magnitude and direction of the resultant of the forces given:1.7N at 45 and 2.4N at -60.

159. Calculus

If f(x)=0.5x+3 then what is fofofof? (composite function)

160. chemistry

A 0.040M solution of a weak acid has a pH of 3.02 at 25°C . What is the value of Ka for the acid?

161. physics

11. The charged plates of a parallel plate capacitor each have a charge density of 3 x 10-3 C/m2. What is the electric field E between the plates?

162. Chemistry

the specific heat of a substance is the energy (Joules) required to raise one gram of substance by one degree celsius (units J/g°C). Heating 225.0° cm3 of a solid from 36.1° to 74.3°C takes 35850 J of energy. The density of the solid at 36.1°C is 1.75

163. Psychology

In testing a theory what type of informal research method did you use?

164. algebra

For me to solve the system of equations for the total cost of lawn care using the tequnique substitution am I right to say: c=\$200+\$50h c=\$300+\$25h would be c=\$250 c=\$325

165. English

My 1st grade son needs to write a paragraph but is having a very hard time grasping the concept. How can I help him with this? He doesn't under stand that the paragraph has to blend/flow and be about the same topic all the way through. What shoudl I do?

166. physics

a .1kg particle with velocity of 5m/s comes in to contact with a solid cylinder at rest of mass 1kg and radius .2meters. what is the final angular velocity

167. Geometry

A kite has diagonals of 16 inches and 23 inches as seen below. What is the perimeter of the kite?

168. Math

A picnic cooler is shaped like a rectangular prism. The dimensions inside are 36 inches by 12 inches by 15 inches. In cubic feet, what is the capacity of the cooler?

169. Math

A developer buys a tract of land 0.5 mile long and 0.25 mile wide. Is this enough land to lay out a 75-acre golf course if there are 43,560 square feet in one acre?

170. MATH

Please check my answers: How are the symbols 3/4, 0.75, and 75% related? They are all different ways to express the same number. 2.(4pts) Use inductive reasoning to predict the next number in the sequence. 1, 2, 2, 4, 4, 8, . . .8 because each number after

171. ALGEBRA

Part III: Mathematics of Finance You have just graduated from college and landed your first big job. You have always dreamed of being a homeowner, and after carefully shopping for your dream home, you find one that you would like to purchase at a cost of

172. mathematical

Having mathematical standards in grades K-12 will give students clear and realistic expectations of what they are expected to learn in mathematics. The following solution explains this importance for students as well as the impact standards have on what

173. World History

007679 1. A staple food transplanted from Southeast Asia to the Mediterranean world as a result of the Islamic Empire was A. wheat. B. rice. C. yams. D. potatoes. 2. How did Alfred the Great secure his modern reputation as a state-builder? A. He gave free

174. mathematical

What are some suggestions teachers can give to parents so that they might assist their children with unfamiliar math concepts?

175. MATH

18-3(2*2)WHAT IS THE ANWSER

176. computer science

How many products are in the windows xp family?

177. algebra 2

10 cm^3 of normal specimen of human blood contain 1.2g of hemoglobin. How many grams does 40cm^3 of same blood contain? Thank you.

178. Science

What is the name of the energy form that can damage buildings if too much of it is present? and What is the name of a form of renewable energy that comes in and out regularly.

179. Math

Hi Trying to work with confusing Taylor series....any assistance would be much appreciated!! How can I use T(x)=5-9((x-2)^2)-3((x-2)^3) to approximate the f(0) ???? I realize that Taylor series f(x)=f(a)+f'(a)(x-a)+f''(a)((x-a)^2)etc... but the above T(x)

180. hemistry

sodium is manufactured commercially by electrolysis of molten sodium chloride. explain why it is not possible to use sodium chloride solution for this.

181. essay

What are some suggestion regarding should the driving age be raised to 18?

182. chemistry

sodium is manufactured commercially by electrolysis of molten sodium chloride. explain why it is not possible to use sodium chloride solution for this.

183. maths

what is the circumference the radius the arc the chord the diameter

184. English-writeacher

Hey, I just wanted to let you know that I got the grade back for that english paper you helped me write a few weeks back...the movie analysis on A Walk to Remember. I got a B! : ) But I have a chance to revise it according to the teachers comments and turn

185. chemistry

whta are the products of electrolysis of the following solutions? potassium iodide nickel sulphate and magnesium chloride

186. Math

If there is 31-days in Janurary, and the first day begin on Thursday. How do I determine four weeks and seven days. Do I count the first three days as week one. Followed with the remaining three weeks.

187. algebra

Try graphing the following two equations. Eq 1 y = 2x + 3 Eq 2 y = 2x + 1 How are these two lines related? What is the solution for this systems of equations?

asked by bianca, pleeease help i'm lost

I just want to get someone's opinion on a question that was on my son's reading test. He's in first grade. Which word has the same beginning sounds as spring. A. spin B. stripe C. spray The answer is C could A not also be an answer. I know the spr in both

189. calculus repost, please assist pleassssssse

Hi Trying to work with confusing Taylor series....any assistance would be much appreciated!! How can I use T(x)=5-9((x-2)^2)-3((x-2)^3) to approximate the f(0) ???? I realize that Taylor series f(x)=f(a)+f'(a)(x-a)+f''(a)((x-a)^2)etc... but the above T(x)

190. math

how do you solve: -3y=3x-9 and 2x-4y=12 and -3x=2y

191. geometry

The diagnol of a rectangle is 20 inches. The width is 4 inches shorter than its length.

192. RESEARCH-THEORIES

What is the difference/definitions of implicit and explicit theories? To be more specific, in social sciences, but I don't think that really matters.

193. Writing

Can you grade me out of 12 points? Did I have any voice? Proofread my writing. A Valuable Item A valuable item is something that’s given to you by a special someone that you will have forever to the end. Many people have valuable items that they love,

194. chemistry

20 ml of 0.1 M Acetic acid and 25 ml of 0.1 M Sodium Acetate are mixed together. then 5ml of 0.1 M of NaOH is added. Find the Ph before the addition of NaOH and after the addition of NaOH??

195. physics

does sunlight warm your body with light waves yes or no and why

196. stats

in major league baseball there are two leagues that compete to make the play offs the american league has three divisions the east and cental divisions with 5 teams each ad the west division with 4 teams the national league is made up of the east and west

197. chemistry

) Aluminum Chloride has a universal indicator color of red and the Ph of 4.0 b) Sodium Carbonate has a universal indicator color of violet and the Ph of 9.5. c) Ammonium Acetate has a universal indicator color of green and the Ph of 7.5 For the following

198. Algebra

12(74y - (6+5Y - 8Z) = Please show work

199. english

give examples of literary and -literay prose by citing examples from any source of your choice 350 words (you may quote the source)

200. Math

Solving Identities [(1+tanx)/(sinx)]- secx I got cscx please halp me to solve it to see if its right

201. math

how would you do this problem 25/40x=50

202. English

Blast 3 points from a team. (At a game, what does that sentence mean? Would you paraphrase the sentence? What does 'blast' mean here?)

203. physics

What is the electric potential at the center of the square shown in the figure below? Assume that q1 = 1 x 10-8 C, q2 = -2 x 10-8 C, q3 = 3 x 10-8 C, q4 = 2 x 10-8 C and d = 1 meter.

204. spanish

esta empezando a hacer frio. comprar un abrigo.

205. Math

a frame is made from a 28 inch length of trim and surrounds a 48 square inch picture. solve for the dimensions of the picture

206. Math

a carnival has a duck pond booth. You choose a rubber duck at random,7 ducks marked as large-prize winners, 9 ducks marked as medium prize winners, and 26 ducks marked as small prize winners. What is the theoretical probability of winning a small prize at

I have been out of school for a long time and not understanding these questions. Please help why is 5^0=1 can you explain when (-3)^n is positive and when it is negative.

208. Algebra

When solving a system of equations by the addition method, how do you know when the system has no solution?

209. Math

The volume of a rectangular slab of concrete needs to exceed 72cu.ft. If the length is 12ft. and he width is 8ft. How thick does the concrete slab need to be?

210. math

If x+y=-10 and x-y=2, what is that value of x?

211. pyhsics

At t= 1.0s, a 0.61 kg object is falling with a speed of 6.0 m/s. At t= 2.0s, it has a kinetic energy of 25 J. 1. What is the kinetic energy of the object at t= 1.0s? 2. What is the speed of the object at t= 2.0s? 3. How much work was done on the object

212. Math

The inside edge of a racing track is shaped like a circle with a diameter of 420 feet. About how many times would a runner have to go around the track to run one mile?

213. math

Find the volume of a cap of a sphere with radius r=86 and height h=48.

BOB pursley

215. algebra

did I solve the problem correctly? c=\$200+\$50h c=\$300+\$25h is the answer c=\$250 c=\$325 Do all I have to do to this equation is to add them to get the total cost of labor with h=labor per hour and c=cost or do I have to solve it in a different way. I'm

You are the chief executive officer of Money Games Inc.(MGI), which has begun to market Borrow & Spend, a video game set in the world of finance. To buy ads, MGI borrows \$50,000 from First Savings Bank. On MGI's behalf, you sign a note for the loan and

217. physics

A mass of 2kg was thrown straight up with a speed of 15m/s. (a) find the initial KE (b) how high does the mass rise? (c) what is the GPE of the mass at the highest point?

218. math

what is a cross product please respond ASAP!!

219. physics

From a tree that is 15m tall, a fruit of mass 2kg falls to the ground. (a) find the initial GPE (b) find the speed at impact (c) find the KE at impact (d) how much energy was lost to heat and sound after the mass came to rest?

220. Chemistry

Which indicator can be used to detect the endpoint of a species that has Ka=1.1 x 10E-8? I used phenolphtalein? is that correct?

221. Chemistry

When sodium forms an ion, will it form a cation or anion?

222. chemistry

What reagent converts sodiumethanoate to methane?

223. Math

Helen stands 66 m away from the base of the tree. If the line of sight makes an angle of 30 with the top of the tree with respect to the horizon. What is the height (h) of the tree?

224. physics

what can you say about the forces on a brick lying still on the floor?

19% of 98

226. algebra 1

I don't understand how to divide monomials with negative (or positive, for that matter) powers. Please help!!!!

227. math

how do you solve: y=2x-1

228. Math

how would you graph: x=7

229. Calculus

Find dy/dx in terms of x and y if (x−a)^9+y^9=a^9. Assume that a is a constant

230. math

arrange the digits 1-9 by inserting plus or minus signs using each ditit only once to produce a total of 200

231. Physics

A car accelerates at a constant rate from 13m/s to 25m/s in 6.0seconds. What was its acceleration? How far did it travel in this time?

232. caculus

find the nth derivative of 2/(x+1) what i have so far is (?)(x+1)^(-n-1) i having trouble with finding the first number without using factorial. 2^(n-1) works for the first few but not after that

233. calculus ( help please )

The troough down the center of the ccattle barn is 40 cm wwide at thhe top and 20 cm at the botttom .it is 30 cm deep and 8 m long . It iis filled at a rate of 10 dm3/min. What is the rate of rise of water level . I tried it and me ans is pretty close but

234. Chemistry

Are binary compounds ionic or covalent? If they are covalent, I thought they don't form bonds that way, since they share electrons.

235. algebra

How to factor 4x^3 -4x+16 ? how can i factor it when its missing the ^2 term ?

236. math

what is A = 37.5 cm 2,b = 8 in.;h =

237. math

A = _,b = 12yd,h = 16 yd

238. Statistics

In 2002 John Daly led the PGA tour in driving distance with an average drive of 305.5 yards and a standard deviation of 17.2 yards. Assuming that these distances are normally distributed, 80% of John Daly's drives are longer than what distance?

239. chemistry

find the percent of BaBr^2*4H^2O

241. english

We sat across from each other during Peggy's recital.

242. inorg, chem

please help me to solve it, thank you so much in advance: propose organic compounds that are isolable with 1. Mn(CO)5(CpCo)(CpCo)C(Co(CO)4)3 2. Cr(CO)4(ì-PH)Cp*Mn(CO)

243. chemistry

what is the molarity of solution made from the equivalent of 125 g of sodium nitrate in 1.0 l of solution

244. math

what is the answer to 18-3(2times2)?

245. chemistry

what final volume in liters of a 2.5 m solution of sodium nitrate can be made using 25.0g of solution

246. Calculus

Find dy/dx in terms of x and y if (x−a)^9+y^9=a^9. Assume that a is a constant.

247. math

Equivalent fractions 1/2,6/10,9/27,4/16

248. Calculus

Find the slope of the tangent to the curve y^2=x^3/(xy+6) at (6,3)

249. science

what are some things that mitosis and meiosis have in common and some things they dont?

250. hitting a hard floor

i weigh 200 drop to hard floor what the force of the falll I'm 5ft 1?

251. calculus

16 over 18 =20 over x

252. calc

find the arc length of f(x)=x^2/2

253. Chemistry

Waht is the mass in mg of 0.016 moles of glucose (C6H12O6)?

254. accounting

True or false ? The columns of the employee earnings record consist of the amount columns in a payroll register and accumulated earnings column? Can you help me answer this question ? thank you.

255. math science

How do you solve (1+tanX)/(sinX)using identities? I got cscX

256. Geography

I have to do a 3d project of the Andes and I am looking for some ideas please help me.

257. math !!!! :O

How many degrees are in the angle between the hands of a clock at 8:00?

258. math :)

Solve for x: 6(x+3) =2x +27

259. math

Mia has a small garden in the shape of a trapezoid as pictured at the top of the next column. The parallel sides of the garden are 5ft and 15 ft. these parallel sides are 10 feet apart. What is the area of the garden?

260. math

How many two-digits multiples of 3 are factors of 144?

1/4tan(2x)

262. computer

how to draw a flow chart to find isoscles triangle

263. math

Write an equation that satisfies the relationship shown in the table of value. x y -2 0 0 4 2 8 5 14 8 20

264. math

Which of the following inequalities has x>4 as a solution A: 6x < -24 B: x+4>0 C: -5x+2 14

265. math

using triple integral, find the volume of the solid bounded by the cylinder y^2+4z^2=16 and planes x=0 and x+y=4

266. math

how do i solve this problem? -4n+5m-2-6n+4-3m

267. Math

how do you graph, y=2/3x-2

268. Social Studies

How did America Respond to Independence?

269. engineering mathematic

using triple integral, find the volume of the solid bounded by the cylinder y^2+4z^2=16 and planes x=0 and x+y=4. please help to solve this problem

270. Math

Find x > 3 such that ln(x) < x^(0.1)

271. math

thanks psyDAG for answering the question below but, can you show how to solve using an equation..x=length and y=width? a frame is made from a 28 inch length of trim and surrounds a 48 square inch picture. solve for the dimensions of the picture

272. math

How do I determine which piece of fabric is the longest (2 3/4 yards of mink), 6 feet of silk), or (108 inches of Velvet)