# Questions Asked onJune 19, 2011

1. ## physics

A supply plane needs to drop a package of food to scientists working on a glacier in Greenland. The plane flies 92 m above the glacier at a speed of 135 m/s. How far short of the target should it drop the package?

2. ## physics

1. The best leaper in the animal kingdom is the puma, which can jump to a height of 12 ft when leaving the ground at an angle of 45°. With what speed, in SI units, must the animal leave the ground to reach that height?

3. ## physics

King Arthur's knights fire a cannon from the top of the castle wall. The cannonball is fired at a speed of 54 m/s and at an angle of 34°. A cannonball that was accidentally dropped hits the moat below in 1.1 s.(a) (a)How far from the castle wall does the

4. ## physics

A 57.0 kg child takes a ride on a Ferris wheel that rotates four times each minute and has a diameter of 23.0 m. (a) What is the centripetal acceleration of the child? (b) What force (magnitude and direction) does the seat exert on the child at the lowest

5. ## physics

A spring is resting vertically on a table. A small box is dropped onto the top of the spring and compresses it. Suppose the spring has a spring constant of 450 N/m and the box has a mass of 1.5 kg. The speed of the box just before it makes contact with the

6. ## chemistry

calculate the mass of phosphorus required to make 200g of phosphine ,PH3 by the reaction: P4(S) +3NaOH(aq) +3H2O(I) ¨3NaH2PO4(aq) +PH3(g)

7. ## Chemistry

Use oxidation numbers to identify if this reaction is REDOX reactions. 3NO2(g) + H2O(l) �� 2HNO3(aq) + NO(g) 3NO2 = -3 for N = -2 for o2 H2O = +1 for H2 = -2 for O ----> 2HNO3 = +1 for 2H = -3 for N = -2 for O3 NO = -3 for N = -2 for O

8. ## Data Management (Math)

A Canadian postal code uses six characters. The first, third, and fifth are letters, while the second, fourth, and sixth are digits. A U.S.A zip code contains five characters, all digits. How many codes are possible for each country?

9. ## PHYSICS

Zach, whose mass is 67 kg, is in an elevator descending at 12 m/s. The elevator takes 3.5 s to brake to a stop at the first floor. (a) What is Zach's apparent weight before the elevator starts braking? (b) What is Zach's apparent weight while the elevator

10. ## World History

How did geographic features affect the settlement of Africa?

11. ## Math

A rectangular lot is to be fenced using 80m of fencing. What is the maximum area and what are the dimensions of the lot?

12. ## Economic

After two quarters of increasing levels of production, the CEO of Canadian Fabrication & Design was upset to learn that, during this time of expansion, productivity of the newly hired sheet metal workers declined with each new worker hired. Believing that

13. ## Physics

A ball is thrown straight up into the air with a velocity of +20.5 m/s. Find the velocity of the ball after 2.5 s.

14. ## math

A ladder , 5 meter long , standing on a horizontal floor , leans against a vertical wall . If the top of the ladder slides downwards at the rate of 10 cm/sec . Find the rate at which the angle between the floor and the ladder is decreasing when the lower

15. ## Physical Science

A 2.9-kg pile of aluminum ( = 2.70 g/cm3) cans is melted, and then cooled into a solid cube. What is the volume of the cube? a. 931 cm3 b. 1074 cm3 c. 1365 cm3 d. 889 cm3 Thank you!

16. ## Chemistry

Use oxidation numbers to identify if this reaction is REDOX reactions. SO2(g) + H2O(l) -> H2SO3(aq) for oxidation #s I got: SO2 = -2 for the S = -2 for the o2 H20 = +1 for H2 = -2 for O --> H2SO = +1 for H2 = -2 for S = -2 for O3 There for one oxygen was

17. ## Algebra

4x+2y-3z=7 2x+4y+z=35 6x+2y-2z=20 solve the system

18. ## Chemistry

Use oxidation numbers to identify reaction is REDOX reactions. a. 2SO2(g) + O2(g) -> 2SO2(g) for 2SO2 I got: -2 for S, -2 for O for O2 I got 0 for 2SO2 I got -2 for S again, and -2 again for 0 Therefore I lost one oxygen and a REDOX reaction occured Am I

19. ## physics

What is the momentum of an automobile (weight = 9800 N) when it is moving at 36 m/s to the south? magnitude

20. ## Physics

In one cycle a heat engine absorbs 450 J from a high-temperature reservoir and expels 290 J to a low-temperature reservoir. If the efficiency of this engine is 57% of the efficiency of a Carnot engine, what is the ratio of the low temperature to the high

21. ## Chemistry

What is the pH of a solution with a concentration of 4.7 × 10-4 molar H3O+?

22. ## Calculus

the side of an equilateral triangle decreases at a rate of 3cm/s. at what rate is the area decreasing when the area is 150cm squared?

23. ## Chemistry

Which of the following is the strongest oxidizing agent in acidic solution? DATA: Ba2+(aq) + 2 e¯ ---> Ba(s); Eo = - 2.91 V Mn2+(aq) + 2 e¯ ---> Mn(s); Eo = - 1.18 V 2 H+(aq) + 2 e¯ ---> H2(g); Eo = 0.00 V Au3+(aq) + 3 e¯ ---> Au(s); Eo = + 1.50 V

24. ## statistics

In a study of cold symptoms, every one of the study subjects with a cold was found to be improved two weeks after taking ginger pills. The study concluded that ginger pills cure colds. Does this conclusion seem reasonable? What other conclusion could be

25. ## Physics

I'm trying to prep for an exam, but I am struggling with the practice questions. I have answers for both questions, but I'm 95% sure they are incorrect. 1. Two students decide to run a race. The first student starts off at a constant speed of 5 m/s while

26. ## Impossible chemistry

2. A eudiometer contains 45 ml of oxygen when the barometer reading is 731.7 mm and the temperature is 27* C . The water level inside the tube is 68mm higher than that outside . What volume does the dry oxygen occupy at S.T.P?

27. ## Algebra

Elena bicycles 4 km/h faster than Robert. In the same time it takes Robert to bicycle 27km/h, Elena can bicycle 39 km. How fast does each bicycle travel?

28. ## statistics

The revenue Commissioners Ireland conducted a contest for promotion. The ages of the unsuccessful applicants are given below. Some of the applicants who were unsuccessful in getting a promotion charged that the competition involved discrimination based on

29. ## trig

the angle in one regular polygon is to that in another as 3:2 and the number of the sides in first is twice that in second determine the the number of sides of 2 polygons

30. ## Chemistry! I need help quick! Thank you very much!

2h2O2 + 2H2O ---> 2H2O + O2 If 50cmcube , 2.0 mole/dmcube of hydrogen peroxide is decomposed and volume of oxygen gas collected. How much hydrogen peroxide is decomposed?

31. ## Chemistry :)

Balance the following redox equation and identify the element oxidized, the element reduced, the oxidizing agent, and the reducing agent. Show all of the work used to solve the problem. NO2- + Al AlO2- + NH3 Thanks :)

32. ## American Govt

How are the The Declaration of Independence and Social Contract Theory similar?

33. ## Chemistry

What is the theoretical molarity value of HCL

34. ## Chemistry

Consider the voltaic cell: Zn(s) / Zn2+(aq) // H+(aq) / H2(g) / Pt(s) Calculate the value of Ecell, in V, when [Zn2+] =1.00 M and [H+] = 0.00100 M DATA: Zn2+(aq) +2 e¯ ---> Zn(s);Eo = - 0.76 V 2 H+(aq) + 2 e¯ ---> H2(g);Eo = 0.00 V

Abby rows 10 km upstream and 10 km back in a total time of 3 hr. The speed of the river is 5km/h. Find Abby’s speed in still water.

36. ## rainwater

What would cause rain water puddle to turn black in color

37. ## Chemistry

A freshman is currently enjoying the Arts Studio program she is pursuing at a well-known university. In her free time, she likes to skate, take salsa dance lessons, and cook. She particularly enjoys pickling and decides to pickle olives over a leisurely

38. ## chemistry

identify and show the bond in the formation of the following; AsH3 BaO BCL3 SO2 ZnC2 CL2 K2S PH3 PLS I NEED AN ANSWER THANKS

39. ## statistics

In a Gallup poll, 1003 adults were called after their telephone numbers were randomly generated by a computer. What type of sampling is this?

40. ## chemistry

1.04 g H2 reacts with 10.2 g N2 producing 2.71 g NH3, what is the theoretical yield in grams?

41. ## math

In the given diagram,AB represents a vertical pole and CD represents a 40 m high tower both of which are standing on the same horizontal plane.From the top of the tower,the angles of depression of the top and the foot of the pole are 24 degrees,30 inches

42. ## statistics

For each of the following samples that were given an experimental treatment, test whether these samples represent populations that are different from the general population: (a) a sample of 10 with a mean of 44, (b) a sample of 1 with a mean of 48. The

43. ## Physical science

A little hexane is poured into a crucible and burnt what is a balanced chemical equation for this reaction

44. ## chemistry

1) what is the mass of 1 mole of Sulfur? 2) How many moles of Silver will be formed from 15 moles AgNO3? Cu + 2AgNO3 ---> Cu(NO3)2 + 2Ag

45. ## Chemistry

2. A eudiometer contains 45 ml of oxygen when the barometer reading is 731.7 mm and the temperature is 27* C . The water level inside the tube is 68mm higher than that outside . What volume does the dry oxygen occupy at S.T.P?

46. ## Life orientation

Ways in which you critically discuss how substance abuse disease impact on the teenager

sin30°ka man

48. ## Poetry

You might behave with this by giving somebody a hug. You might address a gentleman as "Pop." Now if you're truly friendly with the folks you treat with this, That's great. If not, I'd recommend you stop. a. infuse b. essence c. sacrilegious d. familiarity

49. ## Differential Equations

A car is traveling at 70 mph skids 240 ft after it's breaks are suddenly applied. Assuming that the cars breaking system provides a constant deceleration, find that deceleration. How long did it take the car to stop?

50. ## calculus

Find the dimensions of the rectangular garden of greatest area that can be fenced off for \$6000, if the cost of fencing is \$5 per meter.

51. ## Algebra

√(y+4)-4=1 Y = or no solution I keep coming back to no solution but am wondering if I am confusing myself Please check Thank you

52. ## economics

You are a painter, and the price of a gallon of paint increases from \$3.00 a gallon from 3.50 a gallon. your usage of paint drops from 35 gallons a month to 20 gallons a month. perform the following: 1. compute the price elasticity of demand for paint and

53. ## Math

what are thr proper subsets of (march,april, may)

54. ## statistics

A researcher looks at several classrooms, and counts the number of people with brown eyes in each class. Is this qualitative, quantitative-discrete, or quantitative-continuous data

55. ## statistics

Employees are evaluated as below average, average, or above average. What level of measurement is this? a. nominal b. ordinal c. interval d. ratio

56. ## Intermidiate Algebra

Andrew factored the expression -12x^3-28x^2-3x as -4x (3x^2-7x+9). But when Melissa applied the distributive law and multiplied out -4x (3x^2-7x+9), she got -12x^3+28x^2-36x; thus, Andrew’s solution does not appear to check. Why is that? Please help

57. ## algebra

Megan factored the expression 72x^2-43x+6 as (9x-3)(8x-2). But when Jacob applied the FOIL principle and multiplied out (9x-3)(8x-2), he got72x^2-42x+6; thus, Megan’s solution does not appear to check. Why is that? Please help Megan to understand this

58. ## algebra

The length of a rectangle is 2 meters more than its width. If the area is 63 square meters, what are the length and width?

59. ## Life Orientation

10-15 lines critical discuss 5 ways in which the human or environmental impacts on the community?

60. ## calculus

f(x)=−8x 2 −8x+96

Which of the following sentence(s) is written in the active voice? (Points: 5) Jennifer wrote the examination. The examination was written by Jennifer. The examination was written quickly by Jennifer. Jennifer has written the examination. im thinking A any

62. ## Algebra - Quadratics (ZERO PRODUCT PROPERTY)

Can the Property of this: ax2 + bx + c = 0 (a+b)(a-b) = 0 a = -b , a = b BE FURTHER APPLIED TO THIS.....:? ax2 + bx + 8 = 0 ------------------------- -8 -8 x (ax + b) = 8 x = 8 , x = (8-b)/a Thank you!

63. ## Intermedia Algebra

Solve by factoring: 2a^2 − 3a = −5

64. ## algebra

Factor the expression 16x^2-72xy+81y^2 into a product of binomials.

65. ## algebra

Factor out the greatest common factor from the expression 36x^3-30x^2

66. ## algebra

A 125-ft diagonal brace on a bridge connects a support of the center of the bridge to a side support on the bridge. The horizontal distance that it spans is 25 ft longer than the height that it reaches on the side of the bridge. Find the horizontal and

Those who possess this are rarely afraid To go out and to deal with society. If you lack it, then dinners with too many forks Can fill you with fear and anxiety. a. cascading b. sophistication c. aristocrat d. incessantly

68. ## chemistry

Elements in group 2A(2) 0f the periodic table from ions with a change of, How would I find this out. 1+ 1- 2+ 3+ 0

69. ## Chemistry

A gas occupies a volume of 40 ml at 734.8 mm and 22* C . The gas was collected over water and the water level inside the eudiometer is the same as that outside. What is the volume of dry gas at S.T.P?

70. ## calculus

Find the relative max and relative min and the point of inflection, y-intercept for y - x^3 - 9x^2 + 15x. Then sketch its graph.

71. ## Cultural Diversity

I am once again looking for credible resources...I need a resource for the political,social, economic, and familial conventions(norms) or statuses of Mexican-Americans, Puerto Ricans, Cuban-Americans, and Colombian-Americans. I have tried google and the

72. ## human services

can anyone help me understand the Natural Law Ethics: Saint Thomas Aquinas and relationship of the soul and body. I just need to understand the relationship of the soul and body. I have read and reread the chapter.

73. ## Math

When you use the quadratic formula (x= -b+/=......) can you use that on equations like X^4+2X-8? If not, how would you algebraically find the roots of: X^4+2X-8? Thanks!

Is morality is a Social Function (Construction)? This would imply that there is no such thing as REAL morality only the morality that society forces us to follow (both consciously and unconsciously). Use examples to explain your case. [ WARNING: If you do

75. ## Algebra

Hi, I have had to work on several of these types of problems with no success. Could someone help me make the process easier? I have spent many hours with inconsistent results. A company offers their employees two medical insurance plans; Plan A has a \$130

i need graf or diagram solubility Zinc oxid in Ammonium carbonate concentrate & temperature

77. ## health

1 human factor that causes ill health,accindents,crises,and disasters within your community

78. ## science

how is the inventer of hydrogen

79. ## science

when water is turn into steam it expands or contacts many times or both ??? i need help with this question

80. ## calculus

Find the angle ABC, if A = (4, –3, –1), B = (0, 0, 0) and C = (–2, –3, 5) Could you lead me in the right direction I don't know where to start

81. ## math2

Which statement is false? a ¡ô {a, b, c} ¨ª ¡ø {a, b, c} ¨ª ¡ö {a, b, c} ¨ª ¡ô {a, b, c}

Cassandra is repaying an installment loan of \$3,500 with 20 equal monthly payments of \$196 each. what is the annual percentage rate of the loan?

83. ## math

Elisa need to pick a numerical password that contains 4 digits using the numbers 0-9 If none of the digits can be repeated, how many 4-digit passwords are possible

84. ## accounting

What do you think mcdonalds corporate strategy and goals were?

85. ## physics

a mettallic rod of lenght l is rotated with speeed v in uniform magnetic field. find induced current if r is resistance.

86. ## sci

Would you say that with the rise in global warming, and with the increased amount of industrial wastes in the atmosphere, water at this point has a good chance to remain bound with aerosol and other impurities?

87. ## algebra

Factor the following expression completely: 45x^3y – 80xy

88. ## algebra

Factor out the greatest common factor from the expression 9a2b3 – 12a2b4 – 24a3b

89. ## algebra

Use the “difference of squares” rule to factor the following expression: 100a^6-64b^8

90. ## health

Please give two approaches of measuring patient outcomes?

Which word from the choices below is described the poem that follows? We start escaping this when we Sing "A-B-C-D-E-F-G." That song is not enough, and yet The first step is the alphabet! a. aristocrat b. illiteracy c. aura d. essence Help if you can

92. ## calculus

What is the limit definition of f'(x) and use it to find f'(x) for f (x) 5x^2 - 2

93. ## English

Hello. I will really appreciate some help. 1) Is it possible to use "consider" in the context "The US Congress will consider the bill on Friday"? 2) Is it possible to use "implicitly" in the context "He won the elections implicitly" (meaning "he won an

94. ## Pre-algebra

0.2297=(1/x^2-1/49) I don't get how to solve for x. Pls help stuck on a problem

95. ## physics-- waves and photons

Waves and photons ( ) simultaneously be used to describe exactly the same experimental data, even within the same experiment? A) can B) cannot C) sometimes can

96. ## art

• What was the role of ethnic minorities and their influence on the various arts? Can someone help show me where I can look to find this answer. Thank you

97. ## chemistry

i need graf or diagram solubility Zinc oxid in Ammonium carbonate concentrate & temperature

98. ## chemisry

If you have 32g of NH3 how many moles of NH3 is that?

99. ## ap history

the question is Whom does he blame for the alleged conditions to which he refers? this is from benjamin tillman's antiblack tirade 1907. the book is the American spirit ny d. kennedy. it says that he boasted in his speech to the senate "we took the

100. ## fdfd

What is the importance of blue cross blue shield plans in the evolution of health care coverage?

101. ## Intermidiate Algebra

The area of a rectangular athletic field is represented by the expression 25y^2-4z^2 square meters. Write an algebraic expression to represent one possible set of dimensions (in the sense “length times width”) of the athletic field. Include correct

102. ## math

3.5x10^4 expanded form

103. ## calculus

find equation of a tangent line to y=x^3-5x+6 at the point where x=2

104. ## Science

calculate the energy released from a cell in a portable fan that was switched on for 50.0 seconds. The voltage drop was 1.5 V and the current was .55 A.

105. ## SCI/275 (Risk Assessment)

There is a direction in this assignment where the projection of WNV in Genericville is 50 cases. It also mentions that in 2006, there were 4,269 cases, of WNV including 177 fatalities. It follows with the proposal that the Malathion would reduce the

106. ## enviromental science

im struggling to find the answer to this question when will fossil fuels run out? ive looked on different sites but can`t find the answer. thanks for helping.:)

107. ## social studies

imagine if you are an archeologic working on a archeological site etc how you will use your full equipments a.camera b.magnifying glass c.bull dozer d.measuring tape

108. ## intermidiate Algebra

The area of a rectangular athletic field is represented by the expression 16y^7+32y^5+80y^3 square meters. Write an algebraic expression to represent one possible set of dimensions (in the sense “length times width”) of the athletic field. Include

15t^2+7t=2

110. ## Physics

what happens to the index refraction of air as temperature increases?

111. ## calculus

if a rocket is launched upward at 80fett per second. what will its height be at (t) seconds later s= 80t-14t^2

112. ## math

State whether the following sequence is arithmetic, geometric, or neither. 10, 10.25, 10.50625, 10.76890625, ....

113. ## physics

A train passes a control tower with a velocity u and has a constant acceleration.At 800m beyond the tower,the velocity is 48km/h;and at 1.6km beyond the tower,the velocity is 64km/h,what is the velocity u ?

114. ## algebra

what is m^3n-11m^2n^2+28mn^3 factored completely

115. ## History-Civil War

Of the Union Generals covered in the course through 1863, who was considered the worst? The.. site you gave me in the past was of no help at all...was mostly timelines..I came up with George B. McClellan ???????