# Questions Asked onJuly 2, 2013

1. ## Calculus

sand is falling into a conical pile so that the radius of the base of the pile is always equal to one half its altitude. of the sand is falling at the rate of 10 cubic feet per minute, how fast is the altitude of the pile increasing when the pile is 5 feet

2. ## Chemistry

H2 and F2 react according to the following equation, forming HF. H2(g) + F2(g)  2HF(g); H° = –271 kJ If H2(g) and F2(g) were mixed in a thermally insulated vessel, the reaction that occurred would be a. endothermic, and the temperature of the

3. ## Physics

A "rocket car" is launched along a long straight track at t=0s. It moves with constant acceleration a1=3.0m/s^2. At t=2.5s, a second car is launched with constant acceleration a2=9.0m/s^2. 1. At what time does the second car catch up with the first one? 2.

4. ## chemistry

Barium carbonate and nitric acid: BaCO3 (s) + 2HNO3 (aq.) --> Ba2+ (aq.) + 2(NO3-) (aq.) + CO2 (g) + H2O (l) If 25.0mLs of 0.150M nitric acid was used, how many grams of barium carbonate would be required for complete reaction?

5. ## Statistics

Siegel found that elderly people who owned dogs were less likely to pay visits to their doctors after upsetting events than were those who didn’t own pets. Similarly, consider the following hypothetical data. A sample of elderly dog owners is compared to

6. ## Gen. physics

A cart is driven by a large propeller or fan, which can accelerate or decelerate the cart. The cart starts out at the position x = 0 m, with an initial velocity of +6.4 m/s and a constant acceleration due to the fan. The direction to the right is positive.

7. ## Chem

When 1.0 grams of gasoline burns, 11500 calories of heat energy are given off. If the density of gasoline is 0.66 g/ml , how many kilocalories of energy are obtained from 1.5 gallons of gasoline?

8. ## Math

Use the formula to solve the problems. B × In The amount that results when \$6,000 is compounded at 7% annually over eight years=____ The interest earned in this case= ___

9. ## Chemistry

Which of the following statements is incorrect concerning the thermochemical equation below? 2SO3(g)  2SO2(g) + O2(g); H° = 198 kJ a. The enthalpy of the reactants exceeds that of the products. b. The reaction is endothermic. c. For the reaction

10. ## Physics

A solid sphere rolls without slipping from rest down a plane at 4.00m long inclined at an angle of 42 degrees with respect to the horizontal as shown in the figure below. Determine the speed at the bottom of the incline.

11. ## algebra

How do you factor the difference of two squares? How do you factor the perfect square trinomial? How do you factor the sum and difference of two cubes? Which of these three makes the most sense to you? Explain why.

12. ## gen physics

Vector A has a magnitude of 71 units and points due west, while vector B has the same magnitude and points due south. Find the magnitude and direction of (a) A + B and (b) A - B . Specify the directions relative to due west.

13. ## Math

A swimming pool is 0.6m deep, 1.8m, 2m long. A. What is the volume of the pool in cubic meters? B. How many liters of water can the pool hold? C. What is the weight of the water in kilograms?

14. ## Stats

I roll a pair of fair dice and compute the number of spots on the two sides facing up. Denote this total by X. The probability distribution of X is X Prob 2 1/36 3 2/36 4 3/36 5 4/36 6 5/36 7 6/36 8 5/36 9 4/36 10 3/36 11 2/36 12 1/36 The probability that

15. ## Chemistry

If 0.5000grams of barium carbonate was reacted with 25.0mLs of 0.15M nitric acid and the gas then collected in 100mL flask at 77°C, what is the gas pressure in the flask?

16. ## chemistry

. Which of the following will result in a chemical change? A. Melting ice to obtain water B. Evaporating alcohol into vapor C. Drying wood in a shed D. Burning coal in a furnace 2. A salt is obtained as a reaction between A. a nonmetal and a metal. B. a

17. ## Psychology- the Science of the Mind

A reflex, like automatically removing your hand from a hot stove, involves pain message sent to the spinal cord by___neurons, while the movement of your hands is controlled by____ neurons. A. somatic ;sensory B. sensory; motor C. motor; sensory D. somatic;

18. ## Math

the function is h(t)= -4.9t^2+2t+45 (t represents time in seconds and h represents height in metres.) a) how tall is the building? b) how long does it take the balloon to fall on the sidewalk? c)determine the max height of balloon

19. ## Chemistry

Which of the following statements is incorrect concerning the thermochemical equation below? 2SO3(g)  2SO2(g) + O2(g); H° = 198 kJ a. The enthalpy of the reactants exceeds that of the products. b. The reaction is endothermic. c. For the reaction

20. ## Statistics

In a recent year, Delaware had the highest per capita annual income with \$51,803. If o=\$4850, find the mean X that falls at the 95th percentile for a sample of 35 residents.

21. ## Trig

Determine the number of triangles with the given parts. b=24 c=29 B=40deg I got 1

22. ## math

the temperature at 12 noon was 10 degree Celsius above 0.decrease at the rate of 2 degree Celsius per hour until midnight at what time would temperature be 8 degree Celsius below zero? what would be temperature at mid-night?

23. ## Geography

Which of the following global religions arose in India? A. Buddhism B. Jainism C. Hinduism D. Sikhism

24. ## School

What are schools that specialize in your needs? How do they specialize in religion, coed, non-coed, sports, music?

25. ## social question

how much gas do you use to travel 172 miles at 4.00 a gallon.

26. ## social question

how much gas do you use to travel 172 miles at 4.00 a gallon.

27. ## Calculus-HELP!!!!

Show that the function y=c_1 e^x cos(x)+ c_2 e^x sin(x) satisfies the differential equation y''-2y'+2y=0 for any values of c1 and c2, then find the values for those constants that solve the initial value problem y(0)= 1, y'(0)= -1

28. ## financial management

Tribke Enterprises collected the following data from its financial reports for 2012: Stock price \$18.37 Inventory balance \$300,000 Expenses (excluding COGS) \$1,120,000 Shares outstanding 290,000 Average issue price of shares \$5.00 Gross margin % 40%

29. ## gen physics

A tourist being chased by an angry bear is running in a straight line toward his car at a speed of 3.71 m/s. The car is a distance d away. The bear is 30.0 m behind the tourist and running at 4.49 m/s. The tourist reaches the car safely. What is the

30. ## gen physics

(a) What is the magnitude of the average acceleration of a skier who, starting from rest, reaches a speed of 8.02 m/s when going down a slope for 4.28 s? (b) How far does the skier travel in this time?

31. ## physics

A dynamite blast at a quarry launches a rock straight upward, and 2.2 s later it is rising at a rate of 17 m/s. Assuming air resistance has no effect on the rock, calculate its speed (a) at launch and (b)4.4 s after launch.

32. ## math compound interestt

calcualte the compound amount afterr 5 years for an investment of \$7,700 at 6% interest compounded quarterly

What is the amount of compound interest for the investment in previous question

What is the annual percentage yield of a \$10,000 investment for 1 year at 12% interest compounded monthly? (Round APY to the nearest hundredth.)

35. ## Calculus

Show that both functions y1=e^(-2x) and y2=xe^(-2x) are solutions to the differential equation y^''+4y^'+4y=0

In the experiment of buret calibration, what is the importance of having total buret correction? And does the density of the water at a specific temperature affect this corrections?

37. ## statistics

how to caculate using a ruler to measure the thickness of a 25 pages in a textbook

38. ## statistics

how to caculate using a ruler to measure the thickness of a 25 pages in a textbook

39. ## math

15divided by 1 and 2 3rds

40. ## Pre-cal

find all solutions of equation in [0, 2pi) 2 (sec x)^2 + (tan x)^2 -3 = 0

41. ## Home Economics

What is welfare payments or consumers subsidies?

42. ## math

Explain whether the following statement is true or false: “The ordered pair (1,5) is the same as the order pair (5,1).”

43. ## probability

n 1980 (before the era of in-vitro fertilization), there were 3,612,258 births in the United States (according to the U.S. Census Bureau), of which 68,339 births were to twins and 1,337 births were to triplets or more. What was the probability of having

44. ## chemistry

A 5 liter vessel contains 2g of hydrogen and 28g of nitrogen at 27c. Find the total pressure of the mixture?

45. ## maths

f(x)=x ^2 +bx+c , b and c real .Find the minimum of (max|f(x)|)for x∈[−10,10]?

46. ## maths

Find the smallest n such that for any prime p, at least 20 numbers 1,2, ..., n are quadratic residues not modulo p. k is quadratic residue modulo p if there exists an integer j such that j^2 ≡ k (mod p).

47. ## physics

scientific interpretation of two toy cars having bar magnet on the roof .what happen when close to each other from same and different direction?

48. ## Ethics and Moral

Philosophers use the general term "argument" to mean (Points

49. ## physics

A car travels a distance of 100m per second with a constant acceleration and average velocity of 20m per second .The final velocity acquired by the car is 25m per second .Find The initial velocity and acceleration of car

50. ## physics

A car travels a distance of 100m per second with a constant acceleration and average velocity of 20m per second .The final velocity acquired by the car is 25m per second .Find The initial velocity and acceleration of car

51. ## general physics

A 13,900 kg truck is moving at 23.5 m/s on a mountain road when the brakes are applied. The brakes FAIL!! Fortunately, the driver sees a deceleration (ouch!) ramp a short distance ahead. This is an incline used by out of control trucks to dissipate their

52. ## General physics

A 34.1 kg child rides a Ferris wheel whose diameter is 18.3 m. When the ride is turning at a constant rate, the child’s speed has a constant value of 4.23 m/s. Find the normal force the seat exerts on the child at: a) The top of the ride b) The bottom of

53. ## Sciences

A model airplane whose mass is 875 grams flies in a horizontal circle of radius 3.46 m at the end of a string which is at an angle of 10.5o below the horizontal. Find: a) The tension in the string. b) The speed of the airplane. I have answers but I am

54. ## physics

A car tavels a distance of 100 m with a constant acceleration and average velocity of 20 m per second .The final velocity acquire D by the car is 25m per second .find the initial velocity and acceleration of car

55. ## physics

A car travels a distance of 100m per second with a constant acceleration and average velocity of 20m per second .The final velocity acquired by the car is 25m per second .Find The initial velocity and acceleration of car

56. ## trig

Find all solutions of the equation. Leave answers in trigonometric form. x^5-1024=0 I got 4(cos tehta + i sin tehta), tehta = 0, 2pi/5, 4pi/5, 6pi/5, 8pi/5 is this right

57. ## math

give the GCF of each set of numbers and monomial 1. 16,60 2. 52,84

58. ## intermediate algebra

i need to write this algabraically and graph: a runner leaves his house and runs for 30 minutes at 8mph, he rests for 5 minutes and then continues to run home at 5mph.

59. ## Trignometry

solve the triangle. B=77.0deg b=13.95 a=20.6 I got A=38.5deg C=64.5deg c=34.55

60. ## Trignometry

Write the complex number in the form a=bi √(3)(cos π/3 + isin π/3)

61. ## Math

The Chicago Art Museum's Renaissance display consists of four hallways bordered around a square courtyard. A single guard is assigned to patrol the four hallways. When the guard starts working, he begins in one of the corners and walks clockwise. When he

62. ## math

i am a 4 digit decimal. the sum of my digits is divisible by 4. the square of my tenths equals my hundredths place. my thousandths is one less than my hundredths and equals to my ten thousandths. who am i?

63. ## Physics

What is the factor of safety of a steel hanger having an ultimate strength of 630.000MPa and supporting a load of 65000.000N. The steel hanger in question has a cross sectional area of 5.300cm. ANS = (Round to 3 decimal places) Load = 65000.000N ultimate

64. ## Physics

The Ultimate strength of a round steel rod is 630.000MPa. If a factor of safety of 5.000 is required, what is the maximum permissible load for the rod if it has a diameter of 3.000cm? ANS = kN (Round to 3 decimal places) Safety = 5.000 Rod diameter =

65. ## Math

If a man is 8 feet tall. How many meters is he?

66. ## Math

Showing all work convert 315m to dam

67. ## math

A family took a trip. They spent \$90.71 for gasoline, \$153.00 on meals, \$197.00 on amusements, and \$73.38 on miscellaneous expenses. How much did the trip cost? \$

68. ## math

What percent of \$9.00 is \$0.64? To the nearest tenth = %

69. ## chemistry

Using the equipment below, explain how to prepare a 0.00052M HCl solution from a reagent bottle containing 0.13M HCl using only the equipment listed below. Note, you may make multiple dilutions, but you are not allowed to combine volumes. For example, if

70. ## math

What is the largest integer less than 1000 that can be represented as a^3+b^3+c^3 for some integers a,b,c, such that a+b+c=0.

71. ## government

What is the current status of campaign finance reform?

72. ## phy

an ungraduated mercury thermometer attached to a millimeter scale reads 22.8mm in ice and 242mm in steam at standard pressure. What will the millimeter read when the temperature is 20

73. ## literature

in the call of the wild what valiant, tragic figure among the dog must finally be put down for the good of the lives of the team

74. ## phy

if a force of 80N extends a spring of natural length 8m by 0.4m what will be the length of the spring when the applied force 100N

75. ## statistics

population mean of 110 and SD of 6, what is likelihood of having score of 100 0r lower

76. ## Psychology

The amygdala has only a few seconds to determine if an event is dangerous or not and make an initial decision for approach or withdrawal. Upon further appraisal, the _________can override the amygdala's decision and change the course of the person's

77. ## Stats

The incomes in a certain lg. population of college teachers have a normal distribution with a mean of \$35,000 and st. dev. of \$5000. Four teachers are randomly selected. What is the probability their average salary will exceed \$40,000?

78. ## Chemistry

a cube of metal has a mass of 1.45 kg. when the metal is placed into a graduated cylinder containing 356mL of water, the volume increases to 898 mL. calculate the density of the metal in g/mL

79. ## Health Care Communication

Compare the similarities and differences of the principles of communication you learned in Week One with the major components of health communication you learned in Week Eight. What observations do you have from your comparison? Include a list of the

80. ## Health Care communication

Compare the similarities and differences of the principles of communication with the major components of health communication. What observations do you have from your comparison? Include a list of the principles of communication and the major components of

81. ## Precalculus

A 28 foot ladder just reaches the top of a building and forms an angle at 44. 4 degrees with the wall of the building. How many feet is the building tall?

82. ## Physics

A steel bar has a rectangular cross section measuring 1.000cm by 2.900cm and is 8.700m in length. A load of 189000.00N causes the bar to extend 1.500mm. Calculate the stress and strain produced. ANS 1 = kPa (3 decimal places) ANS 2 = (6 decimal places)

83. ## Physics

A uniform bar 1.000 meters in length and having a cross sectional area of 10.000cm^2 is subjected to a loading of 5750.000 Newtons. This load causes an extension to the bar length of 2.740mm. Calculate the stress and the strain produced. ANS 1 = kPa (Round

84. ## Physics

The Ultimate strength of a round steel rod is 630.000MPa. If a factor of safety of 5.000 is required, what is the maximum permissible load for the rod if it has a diameter of 3.000cm? ANS = kN (Round to 3 decimal places) Safety = 5.000 Rod diameter =

85. ## Statistics

Two dice are tossed. What is the probability that the sum of both dice is a prime number? This is what I have so far Presuming two fair, 6-sided dice, each numbered 1 through 6: You can achieve one of the following results on any given roll: 2, 3, 4, 5, 6,

86. ## Aftercare school curriculum

Most common early childhood program in the united states

87. ## Math

An airplane traveled a distance d in t hours, where r>1, and arrived one hour late. The airplane would have arrived on time if it had traveled at what rate per hour? a. t-1 b. d/t-1 c. d/t+1 d. d/t-1 e. d/t+1

88. ## Chemistry

If 25.0 mLs of 0.150M nitric acid was used, how many grams of barium carbonate would be required for complete reaction?

89. ## Chemistry

The phrase “the heat absorbed or released by a system undergoing a physical or chemical change at constant pressure” is a. the change in enthalpy of the system. b. the change in internal energy of the system. c. the definition of a state function. d.

90. ## curriculum content

which one of the following schools is specifically intended for gifted and college-prep students ?

91. ## history

can someone please help me with this question Why do you think Martin Luther King speech begins with a discussion of American History and ends with dreams of a future America

92. ## Physics

A street lamp weighs 158 N. It is supported equally by two wires that form an angle of 107˚ with each other. What is the tension of each of these wires?

93. ## math

15divided by 1 and 2 3rds

94. ## gen.chememistry

a students weighs 1o quaters and finds that their total mass is 56.63 grams . what should she report as the average mass of a quarter based on her data

95. ## Algebra

Using the cumulative and/or associative laws to write two equivalent expressions of x(3y)

96. ## algebra

An airplane climbs at a rate of 66.8 ft per min. It descends at twice the rate it climbs. Assuming it descends at a constant rate, how many ft. Will the airplane descend in 30 min.?

97. ## Chemistry

Bulb A is 100mL and contains Helium at 1atm. Bulb B is 500ml and contains Argon at 2atm The bulbs are connected together by a valve. (assume constant temperature). What is the total pressure of the system after the valves are opened?

98. ## Math

determine the range of each relation for the domain {-3,-2,-1,0,1,2,3} a) y=-3x+4 b)y=2x^2+5 c)y=1/x-4 d) y=-5(x+1)^2-4