1. Chemistry

The amount of energy released by burning a fuel source, measured in energy per mass, is called the fuel value. If all the energy obtained from burning 1.28 pounds of methane (fuel value is 11.97 kcal/g) is used to heat 127.0 kg of water at an initial

2. chemistry

Magnesium reacts with iron(II) chloride according to the equation Mg(s) + FeCl2(aq) → MgCl2(aq) + Fe(s) a. Is magnesium oxidized or is it reduced? Magnesium is reduced. b. Is iron(II) ion oxidized or is it reduced? Iron(II) ion is oxidized . c. What is

3. science

If the magnitude of the electric field in air exceeds roughly 3 X10^6 N/C, the air breaks down and a spark forms. For a two-disk capacitor of radius 52 cm with a gap of 1 mm, what is the maximum charge (plus and minus) that can be placed on the disks

4. physics

The highest barrier that a projectile can clear is 12.7 m, when the projectile is launched at an angle of 17.5° above the horizontal. What is the projectile's launch speed?

5. Math

Gymnast Clothing manufactures expensive hockey jerseys for sale to college bookstores in runs of up to 250. Its cost (in dollars) for a run of x hockey jerseys is C(x) = 2500 + 10x + 0.2x2 Domain(0 ≤ x ≤ 250) Gymnast Clothing sells the jerseys at \$105

6. science

Name the type of reaction that the equation represents? 2Cu + O2 -------> 2CuO

7. chemistry

5. How many grams of KNO3 will be required to prepare 800 mL of 1.40 M KNO3?

8. finance

computing checking account balance. based on the following information,determine the true balance in your checking account. balance in your checkbook-\$356 balance on bank statement,\$472 service charge and other fees, \$15 interest earned on account \$4 total

9. Math/Trig

Which logarithmic equation is equivalent to L^m = E 1) LogL E = m 2) logE L = m 3) logm E= L 4) logE m= L

10. conceptual psychics

suppose that you are an accident investigator and you are asked to figure whether or not the car was speeding before it crashed through the rail of the bridge and into the mudbank as shown. the speed limit of the bridge is 55mph=24m/s. what is your

11. chemistry

a. Cl2 + 2NaI → 2NaCl + I2 This is a single replacement reaction. b. 2K + 2HCl → 2KCl + H2 This is a single replacement reaction. c. N2 + 3H2 → 2NH3 This is a synthesis reaction. d. 2KClO3 → 2KCl + 3O2 This is a decompisition reaction

12. physics

A hockey puck on a frozen pond is given an initial speed of 20.0 m/s. If the puck always remains on the ice and slides 115 m before coming to rest, determine the coefficient of kinetic friction between the puck and ice. (Answer: = 0.177 k μ )

13. BIO

1.Does the appearance of the cave fish and minnow suggest common ancestry? Why 2. Explain the evolutionary relationship between the fin of a fish and the flipper of a whale?

14. buisness

I need help please: Because Saudi Arabia and Australia have ____ in production of crude oil and petroleum products and wool respectively, Saudi Arabia can specialize in the production of crude oil and petroleum products, and Australia can specialize in the

15. trig

The hypotenuse of the right triangle PQR is 16ft. length. The sine of the angle

16. chemistry

convert HCHO to CH3CHO

17. Trigonometry

The expression log(x^n/ radical y)is equivalent to 1. n log x - 1/2 log y 2. n log x- 2 log y 3. log (nx) - log (1/2y) 4. log (nx) - log (2y)

18. Mathematics

OPQRS is a right pyramid whose base is a square of sides 12cm each. Given that the slant height of the pyramid is 15cm. Find the height of the pyramid, the volume of the pyramid, and the total surface area of the pyramid by first drawing the net of the

19. Math

Log8 4 + log16 2 x log 27 81= x solve for x

20. college physics

When two objects of unequal mass are hung vertically over a frictionless pulley of negligible mass, as shown below, the arrangement is called an Atwood machine. Determine a) the magnitude of the acceleration of the two objects and b) the tension in the

22. Math

Worldwide quarterly sales of a brand of cell phones was approximately q = −p + 176 million phones when the wholesale price was \$p. (a) If the cellphone company was prepared to supply q = 9p − 344 million phones per quarter at a wholesale price of \$p,

23. Trigonometry

This is a logs question If u=x/y^2, which expression is equivalent to log u? 1) log x + 2 log y 2) 2(log x- log y) 3) 2(log x + log y) 4) log x- 2 log y

24. Statistics

A telephone company's goal is to have no more than 4 monthly line failures on any 100 miles of line. The company currently experiences an average of 5 monthly line failures per 50 miles of line. Let x denote the number of monthly line failures per 100

25. Math

Please show me how to set it up and to solve: A cell phone company sells about 500 phones each week when it charges \$75 per phone. It sells about 20 more phones per week for each \$1 decrease in price. The company's revenue is the product of the number of

26. algebra

The strength of a wood beam varies inversely with its length. A beam is 33 feet long can support 1200 pounds. How much weight can a similar beam support if it is 23 feet long?

27. BIO

1. Why are the muscles that make hair stand up vestigial? 2. what are the probable functions of the muscles that makes hair stand up?

28. General Physics II

___A __/__\ B/____\C radius (each side of this equilateral triangle) 0.5 m Three point charges are located at the corners of an equilateral triangle as in the figure below. Find the magnitude and direction (counterclockwise from the +x-axis of the net

29. Spanish

Answer in complete sentences. Te gusta más comer el desayuno o el almuerzo? ¿Por qué? My answer: Me gusta más comer en el desayuno porque es nutritivo y bueno.

30. Calculus

1. a) For the Function and point below , Find f’(a). b) Determine the equation of the line tangent to the graph of f at (a,f(a)) for the given value of f(x) = 4x2+2x, a =1 F’(a) = y = 2. For the function find f’ using the definition f’(x) =

31. BIO

1. Why are the muscles that make hair stand up vestigial? 2. what are the probable functions of the muscles that makes hair stand up?

32. math

an electronics store receives a shipment of 40 graphing calculators including 3 that are defective. Four of the calculators are sleceted to be sent to a local high school. How many selections can be made using the original shipment

33. physics

A woman with a mass of 56 kg runs at a speed of 8 m/s and jumps onto a giant 30 kg skateboard initially at rest. What is the combined speed of the woman and the skateboard?

34. Physics

A test tube in a centrifuge is pivoted so that it swings out horizontally as the machine builds up speed. If the bottom of the tube is 145.0 mm from the central spin axis, and if the machine hits 46500 rev/min, what would be the centripetal force exerted

35. math

A telephone company's goal is to have no more than 4 monthly line failures on any 100 miles of line. The company currently experiences an average of 5 monthly line failures per 50 miles of line. Let x denote the number of monthly line failures per 100

36. algebra

Find all integers b so that the trinomial 3x^2 +bx + 2 can be factored.

37. Math

solve the equation 4^2x-2b= (1/8)^x+b for x in terms of b. 1) x=b/7 2) x=7b 3) x=-7b 4)x= -b/7

38. Calculus

Two forces of equal magnitude act to 60 degrees. If their resultant has a magnitude of 30N, find the magnitude of the equal forces.

39. Finance

Caluating opportunity cost. what is the annual opportunity cost of a checking account that requires a \$500 minimum balance to avoid service charges? Assume an interest rate of 3 percent

40. math

The transmitter site of radio station WGGW and the transmitter site of another radio station, WGWB, are on the same highway 100 miles apart. The radio signal from the transmitter site of WGWB can be received only within a radius of 60 miles in all

41. physics

A block of mass 200g and density 0.8g/cm3 is submerged in a liquid of density 0.2g/cm3. find minimum force required to keep the block floating.

42. Math

How can you use a multiplication fact to find a division fact?

43. physics

When two objects of unequal mass are hung vertically over a frictionless pulley of negligible mass, as shown below, the arrangement is called an Atwood machine. Determine a) the magnitude of the acceleration of the two objects and b) the tension in the

44. human resource

1. Regulations governing the employer-employee relationship are based on agency law and failure of an employee/agent to act according to the employer's instructions could result in liability for the employer. 2. Misclassification of employees as

45. algebra

For every positive 2-digit number, x, with tens digit t and units digit u , let y be the 2 digit number formed by reversing the digits of x. Which of the following expressions is equivalent to x-y? a. 9(t-u) b. 9(u-t) c. 9t-u d.0

46. Algebra

The officejet printer can copy sues dissertation in 16 minutes. The laser printer can copy the same document in 22 minutes. If the two machines work together, how long would they take to copy the dissertation?

47. geometry

, AA′ = 33 m and BC =7.5 m. The span is divided into six equal parts at E, G, C, I, and K. Find the length of A′B

48. physics

A coach is hitting pop flies to the outfielders. If the baseball (mass = 145 g) stays in contact with the bat for 0.08 s and leaves the bat with a speed of 75 m/s, what is the average force acting on the ball?

49. maths

xdy-ydx=sqrt(x^2-y^2)dx

50. maths

a box contains 20 fuses ,out of which ,5 are defective.if a sample of 3 fuses is chosen from the box at random without replacement,find the probability that x fuses in this sample will be defective

51. chemistry

a. What is the molecular weight of aspirin (C9H8O4)? 180.1574 amu b. What is the mass of 0.00785 mol of aspirin? 1.41 g c. How many moles of aspirin are present in 100 mg of aspirin? Enter your answer in scientific notation. 5E-4 mol aspirin d. How many

52. physics

You measure your weight by stepping on a spring scale inside an elevator. If elevator accelerates either upward or downward, the spring scale gives a reading different from your weight. a) Calculate how much a 70 kg person weigh a) if the elevator

53. economics

Suppose that the resident of vegopia spend all of their income on cauliflower,broccoli and carrots.in 2006 they buy 100 heads of cauliflower for \$200,50 bunches of broccoli for \$75 and 500 carrots for \$50.in 2007 they buy 75 heads of cauliflower for

54. Physics

A child insists on going sledding on a barely snow-covered hill. The child starts from rest at the top of the 60 m long hill which is inclined at an angle of 30o to the horizontal, and arrives at the bottom 8.0 s later. What is the coefficient of kinetic

55. math

Suppose that an automobile parts wholesaler claims that .5 percent of the car batteries in a shipment are defective. A random sample of 200 batteries is taken, and four are found to be defective. (a) Use the Poisson approximation to find the probability

56. Statistics

Suppose that an automobile parts wholesaler claims that .5 percent of the car batteries in a shipment are defective. A random sample of 200 batteries is taken, and four are found to be defective. (a) Use the Poisson approximation to find the probability

57. physics

an ice skater spins about a vertical axis at an angular speed of 15 rad/s when her arms are outstreched . she then quickly pulls her arms into her sides in a very small time interval so that the frictional force due to ice are negligible.her initial moment

58. us history

Both the Federalists and Anti-Federalists claimed to represent the true spirit of the Revolution. Which group do you think was right? Why?

59. Physics

In black-and-white photography, a photon energy of about 4.00 x 10-19 J is needed to bring about the changes in the silver compounds used in the film. (a) What is the frequency of the light needed to bring about these changes? (b) Explain why a red light

60. Physics

A circular automobile racetrack is banked at an angle theta such that no friction between road and tires is required when a car travels at 28.0 m/s. If the radius of the track is 390 m, determine theta .

61. Chemistry

The amount of energy released by burning a fuel source, measured in energy per mass, is called the fuel value. If all the energy obtained from burning 1.28 pounds of methane (fuel value is 11.97 kcal/g) is used to heat 127.0 kg of water at an initial

62. math

Please show me how to set it up and solve: You are making a rectangular table. The area of the table should be 10ft squared. You want the length of the table to be 1ft shorter than twice its width. What should the dimensions of the able be?

63. literacy ece

the first language arts skill that children learn is A) speaking B)reading C) writing D) listening

64. italian

is cappuccino masculine or feminine is giorno masculine or feminine

65. Physics

A 0.13 kg bullet traveling at 614 m/!@#\$%^&s a 5.7 kg block of wood and stays in the wood. What is the velocity (speed)of the wood block immediately after the bullet hits it

66. physics

a) What is the frequency of a photon of UV radiation ( = 2.00 x 10^-7 m)? (b) Calculate the energy of a photon of UV radiation. (C) What is the frequency of a photon of infrared radiation ( = 1.083 x 10^-6 m)? (d) Calculate the energy of a photon of

67. Math

Please show me how to set it up and solve: You are making a rectangular table. The area of the table should be 10ft squared. You want the length of the table to be 1ft shorter than twice its width. What should the dimensions of the able be?

68. chemistry

HCHO TO CH3CHO HCHO->HCHOH->

69. Calculus (Antiderivatives)

What is the antiderivative of the followring expression? x^(-1/2) sin(2x^(-3/2)) After trying to figure out this problem, I have the suspicion that the antiderivative cannot be found using substition method, would this assumption be correct?

70. physical science

A worker pushes horizontally on a large crate with a force of 312 N, and the crate is moved 6.5 m. How much work was done?

71. Chem

Calculate the volume of .300 M NaOH needed to prepare a pH=3.50 buffer with 250ml of .075M HF solution. pKa (HF) = 3.15

72. communication

extemporaneous presentation, what is the first step of the conclusion? A. Say, "In conclusion..." and continue with a summary of the body. B. Review the main points with a simple, single sentence that names each main point with its one-word or two-word

73. buisness

could someone help me with this question? Which of the following scenarios would not be considered international business? Choose one answer. a. A Chinese manufacturer sells toys to a large toy retailer in the United States. b. Intel sells its processors

74. Statistics

You have a fair die. The die has a 2 on two sides, a 4 on two sides and a 6 on two sides. Note: the only possible outcomes for each roll are 2, 4 or 6. (a) Draw a tree diagram that shows the possible outcomes of rolling the die twice (my answer Roll 1: 2,

75. college physics

Two blocks of masses m1 = 4.00 kg and m2 = 3.00 kg are placed in contact with each other on a frictionless horizontal surface. A constant force F = 9.00 N is applied to the block of mass m1. a) Determine the magnitude of the acceleration of the two-block

76. Math

How do I solve this using substitution method? 7x+9y=-38 -6x+y=50

77. physics

a spring is stretched 5*10^2m by a force of 5*10^-4N.a mass of 0.001kg is placed on the lower end of the spring.after equilibrium has been reached, the upper end of the spring is moved up and down so that the external force acting on the mass is given by

78. Economics

The service of mechanic in fixing the radiator of his car.ist excluded or included gross domestic product and how?

79. PHI 103

A valid argument is one that, if its premises are accepted as true, has (Points : 1)

80. maths

d^2y/dx^2+4dy/dx+4y=4cosx+3sinx

81. physics

A .145kg baseball is thrown at 40 m/s (~89.5mph). What is the momentum of the baseball?

82. Chemistry

when 7.50 grams of iodine (I2) is added to 48.7grams of carbon tetrachloride (CCl4), the iodine dissolves and a solution is formed. The weight percent of the iodine in the solution is? 7.50g I2/ 7.50 + 48.7 X 100 = 13.3 Did I do this correctly?

83. Calculus

Verify this question 1. Determine lim as x->3 (3x-8)/(4x-12), if it exists. (3(3)-8)/(4(3)-12) =1/0 Therefore it doesn't limit doesn't.

84. physics

an airplane has a speed of 600km/h with respect to air. it has to fly a distance of 800km northward. in what direction should it fly if a steady wind is blowing at a speed of 120km/h from the west ? what will its speed with respect to the ground be? draw

85. cells

suppose a cell is placed in a large container of water with a very low solute concentration.what do you think will happen?

86. Physics

A force of 20N applied parallel to the surface of a horizontal table,is just sufficient to make a block of mass 4kg move on the table.calculate the coefficient of friction between the block and the table.

87. Calculus

1. a) For the Function and point below , Find f’(a). b) Determine the equation of the line tangent to the graph of f at (a,f(a)) for the given value of f(x) = 4x2+2x, a =1 F’(a) = y = 2. For the function find f’ using the definition f’(x) =

Please check these answers thanks. 1. The shadow of a vertical pole is 24.8 feet long when the angle of elevation of the sun is 42degrees 0.0'. Find the height of the pole. Answer: 22.3=height 2. From a point on a lighthouse 108 feet above water, the angle

89. algebra

Hong goes running Monday, Wednesday, and Friday of each week. Each Monday he runs miles, each Wednesday he runs miles, and each Friday he runs miles. How many total miles does he run in weeks?

90. PHYSICSSS

Two boxes with different masses M1 = 1.8 kg and M2 = 2.6 kg are tied together on a frictionless ramp surface which makes an angle θ = 21° with the horizontal (see the figure below). What is the tension in the rope connecting the two boxes? N What is the

1) The molecular mass of a substance was determined by the freezing point depression technique. The minimum data required for the determination are: a) delta T and Kf only b) delta T, Kf, and mass of solute c) delta T, Kf, mass of solute, and mass of

92. us history

How did the Articles of Confederation reflect the colonial experience in America? Did the Confederation achieve any positive results? What and how? Discuss the shortcomings of the Articles.

93. Algebra

The officejet printer can copy sues dissertation in 16 minutes. The laser printer can copy the same document in 22 minutes. If the two machines work together, how long would they take to copy the dissertation?

94. Math/trig

Log radical b/ a^2 is equivalent to 1) 1/2 log b + 1/2 log a 2) l/2 log b- 2 log a 3) 2 log b - 1/2 log a 4) 1/2logb/2 log a

95. Math

Suppose that an automobile parts wholesaler claims that .5 percent of the car batteries in a shipment are defective. A random sample of 200 batteries is taken, and four are found to be defective. (a) Use the Poisson approximation to find the probability

96. math

A telephone company's goal is to have no more than 4 monthly line failures on any 100 miles of line. The company currently experiences an average of 5 monthly line failures per 50 miles of line. Let x denote the number of monthly line failures per 100

97. British Literature

What is the symbolic significance of the dagger in the following excerpt from MacBeth--" Is that a dagger which I see before me, the handle toward my hand? Come, let me cluth thee. I have thee not, and yet I see these still. Are thou not, fatal vision,

98. Science

A 70kg person dives horizontally from a 200kg boat with a speed of 2 m/s. What is the recoil speed of the boat?

99. Statistics

You have a bucket with 3 black balls and 7 red balls. What is the probability of drawing 2 reds and 1 black in 3 draws if order is not important? (Assume replacement after each draw)

100. Math 208

Grade Average A student scores 65 and 82 on two different 100-point tests. If the maximum score on the next test is also 100 points, what score does the student need to maintain at least an average of 70?

101. Trigonometry

Given log 3= x and log 5 =y Express radical 3/5 in terms of x and y. 1) 1/2x-y 2) 1/2(x-y) 3) 1/2xy 4) 2(x-y)

Can you please check these answers thanks 1. A ladder 14 feet long is leaning against a house. The foot of the ladder is 4.8 feet from the house. Find the angle of elevation of the ladder and the height it reaches on the house. Answer: 13.2=height 18.9

103. Physics

A 520 Hz tuning fork produces a standing wave in a column of air in a closed tube. If the speed of sound is 340 m/s, what is the length of the air column?

104. British Literature

"This supernatural soliciting. Cannot be ill, cannot be good. If ill, Why hath it given me earnest of success Commencing in a truth? I am Thane of Cawdor. If good, why do I yield to that suggestion Whose horrid image doth unfix my hair And make my seated

105. english

is this a good narrative essay i wrote? A very good choice The day I crashed the bike is very vivid still. I destroyed someone else’s property. The property I broke was not very valuable. Five years ago, my family and I went to Cloverdale, California, My

106. PHYSICSSS

A train engine pulls out of a station along a straight horizontal track with five identical freight cars behind it, each of which weighs 88.0 kN. The train reaches a speed of 13.0 m/s within 6.50 min of starting out. Assuming the engine pulls with a

107. Statistics

A bucket has 3 blacks and 7 red balls. (a) What is the probability of drawing a black fall on the first draw? (my answer - 3/10 x 100 = 30%) (b) What is the probability of drawing a red ball on the 2nd draw if you replace the black ball you drew on the

108. Physics

A projectile of mass 1.350 kg is shot straight up with an initial speed of 22.0 m/s. (a) How high would it go if there were no air friction? (b) If the projectile rises to a maximum height of only 17.8 m, determine the magnitude of the average force due to

109. physics

a stretched string is observed to vibrate with frequency 30Hz in its fundamental mode when the supports are 60cm apart. the amplitude at the antinode is 3cm.the string has a mass of 30kg.calculate the speed of propagation of the wave and the tension

110. algebra

The following graph shows how a 4-color web printing press depreciates from the year 2006 to the year 2010. It was purchased new in the year 2006; therefore x = 0 represents the year 2006. X – axis (horizontal) = years starting from 0 = 2006 and

111. math

solve (4x^3y^3+1/x)dx+(3x^4y^2-1/y)dy=0

112. Statistics

Seven thousand raffle tickets are to be sold at \$10 each to benefit a local community group. The prizes, the number of each prize to be given away, and the dollar value of winnings for each prize are as follows: Prize Number to Be Given Away Dollar Value

114. math

Seven thousand raffle tickets are to be sold at \$10 each to benefit a local community group. The prizes, the number of each prize to be given away, and the dollar value of winnings for each prize are as follows: Prize Number to Be Given Away Dollar Value

115. physics

a plane is flying with a constant speed along a straight line at an angle 60degree with the horizontal. the weight(W) of the plane is 90,000N and its engine provides a thrust(T)of 120,000N in the direction of flight . two additional forces are exerted on

116. us history

Tracing the history of the colonial-British relations, defend or refute this statement: The American Revolution makes no sense. From 1607 – 1775, the colonists, colonial governments, Parliament, and the King were all British – all under the umbrella of

117. statistics

5. The ages of husbands and wives in a community were found to have a correlation coefficient equal to +0.8; the average of husbands’ ages was 25 years and that of wives’ ages 22 years; their standard deviations were respectively 4 and 5 years. Find

118. physics

As a moon follows its orbit around a planet, the maximum gravitational force exerted on the moon by the planet exceeds the minimum gravitational force by 9.8%. Find the ratio rmax/rmin, where rmax is the moon's maximum distance from the center of the

119. Calculus

Consider the differential equation, dy/dx=(x+1)/y^2 with the initial condition y(0)=3. Write down the particular solution, and hence, calculate the value of y when x=8.7, to 3 dec places.

120. Chemistry

How do you find the ratio of moles of oxygen to moles of tin? What would be the Empirical formula of tin oxide from the result of ratio? From my calculations I got the moles as: Moles of oxygen = 1.761 x 10^-2 Moles of Tin = 8.944 x 10^-3 Thanks!

121. algebra

Our hardware store buys tools for \$15 each, marks them up and sells them for \$30. Their monthly expenses (fixed costs) are \$10,000. a. What is the cost function? b. What is the revenue? c. How many units must be sold for the company to get a profit?

122. British Literature

In "A Vindication of the Rights of Woman, Mary Wollstonecraft argues that women should receive education because of what? Could it be either raising a family requires good judgment or that they require some means of supporting themselves independent of

123. College Physics

An artificial satellite is moving in a circular orbit with a speed of 6.5 km/s and a period of 80.0 min. A retarding rocket fires in a direction opposite to the motion. This provides a retarding deceleration of 21.0 m/s2. What is the acute angle between

124. algebra

A taxi driver charges a flat rate of \$3.00 and \$0.08 per mile traveled

125. communication

organized the body of her presentation with the following ideas: First major section - drunk driving accidents have increased between the hours of 2AM and 5AM in Oak Cliff. Second major section - the City of Dallas should increase police protection outside

126. algebra

How many solutions do the linear equations x-y=2 -2x+2y=-1 have?

127. physics

Two blocks of masses m1 = 4.00 kg and m2 = 3.00 kg are placed in contact with each other on a frictionless horizontal surface. A constant force F = 9.00 N is applied to the block of mass m1. a) Determine the magnitude of the acceleration of the two-block

128. physics

find the solution of the wave equation for a vibrating string of length (l)=10units with ends fixed .it is given that c^2=1,initial velocity is zero and initial deflection is u(x,o)=k(sinx-sin2x)

129. English

I need to turn these sentences (or notes) into a cohesive paragraph, using sentence connectors instead of points and improving the word choice. Could you please help me? Robinson’s education of Friday recalls the processes of modern colonialism, which

130. math

1.) The first person !@#\$%^&quires your assistance is Tina the bearded lady. Tina’s side job is to look after the elephants (she double majored at circus university.) a. Tina must fill the semi-circular trough shown above with peanuts. Tina knows that

131. Math

If you have a parallelagram ABCD, and line segment AB is on the left, can you read it as BA as well or is that backwards? Of if the alphabetical order was different and it was parallelagram PGAD, would you still only be able to read it as line segment PG

132. writeacher

i writing essay on what true love be and this be one sentence in my essay you please able to change it to positive? i have negative word which be unable in essay. In the short story, "The Painted Door", by Sinclair Ross, the main characters John and Ann

133. enron

Which segment of its operations got Enron into difficulties?

134. maths

write down the equation d^2u/dt^2=c^2 grad^2u in a plane polar coordinates .by the method of separation of variables , reduce the PDE to obtained to a set of ODE's

135. us history

What groups in America gained the most from the war? What groups lost the most? For which groups, if any, did things stay just about the same? How did the war influence the place of slaves in America? Of Indians? Women?

136. maths

r1 and r2 are unit vectors in the x-y plane making angles a and b with the positive x-axis.by considering r1.r2 derive cos(a-b)=cos(a)cos(b)+sin(a)sin(b)

137. percentage

Choon yong was asked to paint a wall of area 84 meter square.In one hour,he had painted 21meter square. a)what percentage of the wall was left unpainted?

138. Engineering

Calculate the moment about a point (5; 4; 3) ft. caused by the forces P = 3^i - 2^j - 4^k lb. and Q = 5^i + 7^j - 2^k lb. acting at the points (7; 2; -2) ft. and (-3; -2; 5) ft., respectively. What I did was this; vector r1= (7,2,2) - (5,4,3) = 2i-2j-5k

139. PHYSICSSS

While an elevator of mass 2681 kg moves upward, the tension in the cable is 29.4 kN. (a) What is the acceleration of the elevator? (b) If at some point in the motion the velocity of the elevator is 1.04 m/s upward, what is the elevator's velocity 3.96 s

140. physics

The Earth orbits the Sun once per year.What is the centripetal force keeping the Earth in orbit? T = 1 year (convert to seconds) r = 1.5e+11 meters m = 6e+24 kg

141. physics

an object was launched with the velocity of 20 m/s at an angle 45 degree to the vertical . at the top of its trajectory the object broke into two equal pieces.one piece fell vertically downward .where would the other piece fall?(g=10m/s^2)

142. science

in the first second of its flight, a rocket ejects 1/60 of its mass with a velocity of 2400 m/s the acceleration of the rocket is

143. math

mary purchaseda mattress set for 800\$ she paid 44\$ in taxes what was the sales taxe rate

144. Calculus

I don't know what to write for question b and c. 1 a)Determine the values of x for which the function f(x) = 3/(√x^2+3x-4) is continuous. Values of x are -4 and 1. -------------------------------------- b) What does your answer in part a. represent? c)

145. percentage

A jug contained 780ml of milk.Mrs Li poured 221ml of the milk into a glass and 130ml into a cup.what percentage of milk was left in the jug?pls give ur answer clearly

146. network neutrality

1. Explain what Net Neutrality is 2. Explain who wants and who doesn’t want Net Neutrality 3. Explain the Obama administrations stance on the issue 4. Why didn’t the FCC’s ruling cover wireless providers can you please help me find a link/websites

147. ece

words are A)communication shortcuts B) not arbitray symbols C) unique to ea. indidividual in english D) thoughts written down I like A and also D thoughts written down not sure which

148. financial accounting

I am preparing an adjusted trial balance and I have almost gotten my debits to equal my credits. I need to figure out how much to debit the equipment and how much to credit the accumulated depreciaton. To give you an idea of the gap between the two, my

149. physics

a circuit consist of an inductance of 0.05H, a resistance of 20ohms , a capacitor of 100uF and an angle of 100cos200t. find (i) and (q) given that q=0,and i=0 at t=0.

150. English

Thank you very much. Here is a summary I need to make on Defoe's Robinson Cruseo. I used the present as we once suggested to me. 1) At the age of 19 he decides to leave his home, ignoring his father's advice, in order to travel around the world and make

151. english

i not know how to expand my thought on love. i now realize that love not be unconditional. this only exist in fantasy, but in real life it not like this because you not be able to sacrifice yourself for someone else's sake, especially if they are doing a

152. English

Here is a part on Defoe's life you have already revised. THank you I added a sentence I need you to check (sentence 4) 1) He was born in London 1660 into a Puritan family and lead a life full of interesting and important events. He was educated in one of

153. Calculus

hah im trully very SORRY, ok now i double checked.. so everything should be right .... u, v, w are UNIT VECTORS. the angle between u and v is 25 degrees and the angle between vector v and w is 35 degrees. find (u+w-3v). NOTE: vector u and w are on opposite

154. Math

Seven thousand raffle tickets are to be sold at \$10 each to benefit a local community group. The prizes, the number of each prize to be given away, and the dollar value of winnings for each prize are as follows: Prize Number to Be Given Away Dollar Value

155. Chemistry

How much heat is required to raise the temperature of a 65-g sample of water from 32 degrees celsius to 65 degrees celsius

Describe a way you can become a victim of a static electric shock. Explain what caused the static electric shock.

asked by Sameer I NEED HELP ASAP
157. English

What is romantic in the novel "The Great Gatsby" that happens between ch. 1-6?

158. algebra

If trend for the depreciation of the press continued, what would be its value in the year 2015? Show how you obtained your answer using the linear equation you found in part c). Answer: Show or explain your work here: e) If the trend continued, in how many

159. Spanish

Answer in complete sentences. Te gusta más comer el desayuno o el almuerzo? ¿Por qué? My answer: Me gusta más comer en el desayuno porque es nutritivo y bueno.

160. chemistry

What would happen if MnO2 was mixed with KBrO3 ND 9 M sulfuric acid?

161. Math

swimming pool Theflow rate for one pipe is 1 1/4 that of another pipe. A swimming pool can be filled in 5 hours using both pipes. Find the time to fill the pool only using the pipe with the lower flow rate.

162. calculus

Find the equation of the tangent to the curve sin(x+y)=xy at the origin.

163. British Literature

What argument does Aphra Behn make about her two loves in the passage: "How strongly does my passion flow, Divided equally 'twixt two? Damon had ne'er subdued my heart, Had not Alexis took his part; Nor could Alexis powerful provce, Without my Damon's aid,

164. algebra

sorry here it is... The 1st part of the trip the canoeist travels 60 miles at a certain speed. On the second part, he travels 18 mi at 5 mi slower. The total time is 3 hours. What was the speed on both parts of the trip??

165. British Literature

Does Amelia Lanier make any of the following arguments in "Eve's Apology in Defense of Women?" Eve asserts the superiority of women over men; Adam is to blame for the expulsion from Eden as he is wiser and more powerful and should have known better; Eve is

166. communication

persuasive presentation. One of the articles found contradicted the other four. decided she just wouldn't include the contradictory information. The choice would fall into: a.Good Persuasive Strategy b. Ethical Principles c. Problem-Solution Format d.

167. Physical science

Is it possible for an object to have more kinetic energy but less momentum than the other object? Less kinetic energy but more momentum? *i know the answer to both questions is yes, however, i cannot think of examples ??

168. percentage

Evelyn has a ribbon 420cm long.She uses 216cm to decorate a present.what percentage of the ribbon is left?Express your answer correct to 1 decimal place

169. Statistics

I need help with (b): A small company with 5 employees wants to know some statistics about their employee's ages. They surveyed the 5 employees and found that their ages were: 22, 29, 35, 37 and 42. (a)Determine: Mean age: 33 Median: 35 Range: 20 Variance:

170. math-measurement

How do i subtract 20 minutes 45 seconds from 1/2 hour

171. Algebra

the denominator of a fractio is an integer that is one greater than the numerator. A second fraction is the reciprocal of the integer that is one less than the numerator of the first fraction. If the product of the two fraction is 3/8 identify the first

172. physics

Phrank (36.4kg) runs at 2.2 m/s and jumps onto a large stationary skateboard (2.3kg) on which Phrancine (22.7kg) is sitting. After the collision, Phrank, Phrancine, and the skateboard move at 1.3 m/s. Find the momentum before and after the collision along

173. sales tax

How much tax is there on 268.00 @6%

174. Calculus

Can someone help me with this question. With steps. Examine the continuity of the function h(x)= -x, if x0

175. Statistics

A construction company builds apartment buildings. The construction time follows a normal distribution with a mean time of 200 days and a standard diviation of 20 days. (a) What is the probability of completing a building in 224 days or less? (b) What is

176. Music

List the elements of music.

177. physics

a circular disc rotates on a thin air film with a period of 0.3s. its moment of inertia about its axis of rotation is 0.06kgm^2. a small mass is dropped onto th disc and rotates with it . the moment of inertia of the mass about the axis of rotation is

178. British Literature

Which aspect of an epic is present in the following passage from Beowulf? "Then he saw, hanging on the wall, a heavy Sword, hammered by giants, strong and blessed with their magic, the best of all weapons but so massive that no ordinary man could lift its

179. British Literature

Charlotte Turner Smith's sonnet "Written the close of Spring" best exemplifies what motif? Examples given are the parallels between human existence and nature; the cyclical nature of human existence; the facrt that the happiness of youth comes only once;

180. math

the bulletin board is 48 inches long and 24 inches wide. How many yards would they need for the trim?

181. physics

A string connecting a car of mass x1 on an air track is connected to another mass, x2, by a string over a pulley. If the string has appreciable mass will the car still undergo constant acceleration? Explain I think that the car will still undergo constant

182. US/ 101Week 5 DQ4

Have you ever used mnemonics to remember something complicated? If so, describe these techniques. How might you use mnemonics to be a more effective college student and adult learner?

183. chemistry

Calculate the following: (a) mass of water in the hydrate sample (g): (b) number of moles of water in the sample: (c) mass of pure salt in the sample (g): (d) number of moles of salt in the sample: (e) molar ratio of water to salt in the sample: If the

184. tax and discount

Carmen is going to buy a pair of jeans that cost \$30.00. the jeans are on sale for 20% off. Carmen knows she will pay 8% ales tax. what will the final cost of Carmen's jeans after the discount and sales tax?

185. Algebra

the altitude of a triangle is 3m less than half its base. If the area of the triangle is 300 m^2 find the measure of the base.

186. Calculus

Is this the right explanation for this question 1. Examine the continuity of the function h(x)= -x, if x0 Answer: Since h(x)= -x, if x0 is h=|x|, we can conclude that the function is 1. continuous everywhere 2. discontinuous at x=0 because limit from the

188. Math

There is a ratio of number of boys to girls 3:5. After adding 5 boys and 3 girls, the ratio become 5:7. How many girls were there at first?

189. ELA

We have to make an ad for dog food What should I name the brand of the food?

190. physics

a bus is moving downhill at a slope of 5 degree . at the moment when the speed of the bus is 30km/h,the driver spots a deer 30m ahead. he applies the brakes and comes to a stop. the is paralysed by fear and does not move.will the bus stops before reaching

191. physics

for a sateliite to have a speed of 7400 m/s how far must it be in metres above the earth's surface

192. British Literature

In the following passage from Chaucer's General Prologue, "In all the parish not a dame stirred, Towards the altar steps in front of her, And if indeed they did, so wrath was she As to be quite out of charity," I believe that the Wife of Bath can best be

193. communication

we will begin with the history, then present situation, and with the future. If this were a sentence in an extemporaneous presentation, a.Preview Statement b.Attention Strategy c.Transition to Main Point Three d. Thesis Statement I think it is a thesis

194. Calculus

u, v, w are UNIT VECTORS. the angle between vector v and w is 35 degrees. find (v+w-3v). NOTE: vector u and w are on opposite sides of vector v.

195. ece

let me in said the pin is an example of? A. assonance b. metaphor c. alliteration d. personification i choose d is this correct

196. Calculus

SORRY, i wrote this question wrong before ... u, v, w are UNIT VECTORS. the angle between u and v is 25 degrees and the angle between vector v and w is 35 degrees. find (v+w-3v). NOTE: vector u and w are on opposite sides of vector v.

197. English

I added a few details to my previous summary. I need you to check it. 1) During his journey, he is shipwrecked on a desert island off the coast of South America, near the mouth of the Orinoco River, where he remains for 28 years. 2) To get himself food he

198. math

Mary worked 30 hours this week, five of these hours were on Christmas Day (holiday pay). Determine Mary’s gross pay for this week

199. Engineering

Calculate the moment about a point (5; 4; 3) ft. caused by the forces P = 3^i - 2^j - 4^k lb. and Q = 5^i + 7^j - 2^k lb. acting at the points (7; 2; -2) ft. and (-3; -2; 5) ft., respectively. What I did was this; vector r1= (7,2,2) - (5,4,3) = 2i-2j-5k

200. Chemistry

Calculate how many moles of sodium hydrogen carbonate are needed to produce 59 grams of H2O.

201. Math

There is a ratio of number of boys to girls 3:5. After adding 5 boys and 3 girls, the ratio become 5:7. How many girls were there at first?

202. Sttistic

tobt = 1.49. Report the statistical results using the correct format. To find the t-crit value, one must first find the df. This can be found by subtracting one from N. So, 25-1 = 24. Using the one-tailed t-table from Appendix B (Heiman, 2004), with an

203. English

Here is the criticism on the novel I need to improve 1) The story is told by a first-person narrator and is thus a faked autobiography. To enhance realism to the story (to reinforce the idea of realism), Defoe supplies many facts about Robinson (is is

204. Biology

What important role does the marine compost play in a marine ecosystem?

205. math

I need .5 feet of ribbon to make one decoration. How many feet of ribbon do I need to make 600 decorations?

206. Statistics

If red has a probability of occurrence of .70 and black has a probability of occurrence of .30 and they are the only choices what is the probability that you pick the right color 10 out of 10 times and what is the standard deviation. I keep getting

207. Accounting

Case study 2 Sailmakers Ltd John Jeffries recently left the army after more than 20 years in the service. He had decided that at 45 years of age it was time to start a second career. Throughout most of his life John had a passion for yachting and had

208. Social 30-1

Who benefited from the growth of classical liberalism during the industrial revolution? Who did not benifit from it? Why didn't the theorys of classic liberalism extend to all classes and people?

209. physics

a mass of 60kg slides on a table. the frictional force is 60 times the velocity and the mass is being pushed with a force of 54sin2tN.find the velocity as a function of time if (v)=0 at (t)=0

210. College Algebra

49x^4 - 70x^3 + 21x^2. Facotor out, relative to the intergers, all factors common to all terms.

211. math

The sum of the digits of a two-digit number greater than 50 is 12. The difference between the digits is 4. Find the two-digit number

212. Chemistry

How much 0.5 M HCl is needed to neutralize 5.5 kg of ammonia dissolved in 6 gal of water?

213. Physics/ Engineering

Calculate the moment about a point (5; 4; 3) ft. caused by the forces P = 3^i - 2^j - 4^k lb. and Q = 5^i + 7^j - 2^k lb. acting at the points (7; 2; 2) ft. and (3; 2; 5) ft., respectively. What I did was this; vector r1= (7,2,2) - (5,4,3) = 2i-2j-5k

214. calculus(integral)

intergral 2x^2/(x^2+4x+8)

Describe a way you can become a victim of a static electric shock. Explain what caused the static electric shock.

216. Science

1. These are a few descriptor words that we use to describe some organisms: carnivore herbivore scavenger carrion detrital feeder decomposer filter feeder producer Choose words which can be applied to: a) sandworm (Parchment Worm) b) soldier crab c)

218. Art

Give 4 examples of graphic designs.

219. English

Thank you very much! Can I divide my work into summary, narrative structure, and main themes? This is the very first part of the summary. I don't know if it is correct to use the present. Could you please revise it? 1) At the beginning of the novel we get

220. Science

How do fossils help to correlate layers of rock?

221. english

i need help making my conclusion sentence more sense for essay on love. True love be built on solid base of trust, commitment, selflessness and shared admiration without judgment and physical attraction.

222. physics

A string connecting a car of a certain mass, x1, on an air track is connected to another mass, x2, by a string over a pulley. If the string has appreciable mass will the car still undergo constant acceleration? Explain. I think it will still undergo a

223. physics

A string connecting a car of a certain mass, x1, on an air track is connected to another mass, x2, by a string over a pulley. If the string has appreciable mass will the car still undergo constant acceleration? Explain. I think it will still undergo a

224. English

Sorry, I forgot to include this part. Thank you very, very much. 1) Robinson defeats the mutineers and rescues the legitimate crew. At last, Robinson and the ship’s crew sail back to England. 2) After 28 years on the island and 35 years of total absence

225. algebra

would you please help me answer this question??? thanks mary wants to spend \$70. at most for gifts but only has 60 cubic inches of space in her suitcase. rings cost \$7 and take up 3 cubic inches of space and scarfs are \$5 and take up 15 cubic inches. Write

227. Calculus (Antiderivatives)

What is the antiderivative of the following expression? 3x(x^2 + 7)^3

228. Chemistry

Calculate how many moles of sodium hydrogen carbonate are needed to produce 59 grams of H2O.

ty ms. sue

230. Meteorology

I have a skew t diagram and I need help with the following Temperature at the surface: Dewpoint at the surface: Winds near the surface: Temperature at 700 mb: Dewpoint at 700 mb:

231. Algebra

Find the square roots of 25

232. us history

How did demonstrations against imperial policy include obvious violations of the law? How did colonists justify their actions? Are those justifications valid? Did they have any legal means of expressing discontent?

233. math

can someone please help me understand how to get a z score. For example I have to find the z score for: x and y and x is 2 and y is 3

235. science

what is the nature of solute particles in electrolyte solution?

236. median

what is the median for 9,2,8,1

238. Sociology

what is a bureaucracy?