# Questions Asked onJuly 21, 2010

1. ## Math11U

A surveyor in an airplane observes that the angle of depression to two points on the opposite shores of a lake are 32 and 45 degrees, respectively. What is the width of the lake to the nearest metre, at those two points?

2. ## physic

Calculate the pressure exerted on the ground by a79kg person standing on one foot. Assume that the bottom of the person's foot is 13cm wide and 28cm long.

3. ## Math Trig

A coast guard patrol boat is 14.8 km east of the Brier Island Lighthouse. A disabled yacht is 7.5km south of the lighthouse. a) How far is the patrol boat from the yacht, to the nearest tenth of a kilometer? b) At what angle south of due west, to the

4. ## Math

Montreal’s Marathon building is 195m tall. From a point level with, and 48m away from, the base of the building, what is the angle of elevation of the top of the building, to the nearest degree?

5. ## PHYSICS

which of the following describes a scalar quantity? A. it has direction only B. it has magnitude only C. it is the size of a quantity D. it has both direction and magnitude I say B.

6. ## physics

A 300kg motorboat is turned off as it approaches a dock and it coasts in toward the dock at .5 m/s. Isaac, whose mass is 62kg, jumps off the front of the boat with a speed of 3m/s relative to the boat. what is the velocity of the boat after Isaac jumps?

7. ## math

As the sample size n increases, the standard error of the proportions will __________. a)be equal to one b)become larger c)become smaller d)remain the same IS IT B)?

8. ## Math(trig)

Peggy’s Cove Lighthouse, in Nova Scotia, is possibly the most photographed lighthouse in the world. From the observation deck, the angle of depression of a boat is 6º. How far is the boat from the lighthouse, to the nearest metre?

9. ## science

if 1000 grasshoppers weigh kg how much does one grasshopper weigh?

10. ## British Literature

1)What theory does the narrator propose in the first paragraph of “The Mark of the Beast”? A) In Asia, Asian gods rather than the Christian God control most events. B) The British Empire is doomed because it disregards the values and traditions of

11. ## Chemistry

1. The delta Hf of an element in its standard state is defined to be a) 0 kJ/mol b) 10 kJ/mol c) -10 kJ/mol d) greater than 0 kJ/mol e) a unique value for each element I am assuming its a? 2. Which of the following statements are true? I) The reaction

12. ## pysic

A 328 kg car moving at 19.1 m/!@#\$%^&s from behind another car moving at 13.0m/s in the same direction. If the second car has a mass of 790kg and a new speed of 15.1m/s what is the velocity of the first car after the collision?

13. ## PHYSICS

A canada goose flew 860 km from washington to British COlumbia with an average velocity of 30.5 m/s [N]. Approximately how long did it take the goose to make its journey? A. 0.04 h B. 7.8 h C. 28.2 h D. 469.9 h I say C.

14. ## algebra

solve by elimination 3x+4y=2 6x+8y=4 stuck!!

15. ## Physics

"Vibrators A and B are sources of waves with different wavelengths and they are placed close to one another in a ripple tank. Waves from source A have a wavelength of 8.0cm while those from B have a wavelength of 10cm. The waves start out in phase with

16. ## physics

how much energy is needed to heat 50 grams of ethanol

17. ## Chemistry

1.What is the molar heat of vaporization of water, given the following thermochemical equations? H2 + 1/2 O2 --> H2O + 241.8 kJ H2 + 1/2 O2 --> H2O + 285.5 kJ a) 44.0 kJ/mol b)-44.0 kJ/mol c)241.8 kJ/mol 2. Which substance has a standard enthalpy of

18. ## Chemistry

The overall rate of any chemical reaction is most closely related to a) the number of steps in the reaction mechanism b)the overall reaction c) the fastest step in the reaction mechanism d)the slowest step in the reaction mechanism e) the average rate of

19. ## PHYSICS

Which two terms represent a vector quantity and the scalar quantity of the vector's magnitude, respectively? A. velocity and speed B. time and time interval C. acceleration and velocity D. position and displacement I say it's A.

20. ## math

1.)Explain why ironing boards always remain parallel to the floor and can be adjusted for people of various heights. You may want to consider the following: a.)The legs of the board are built so that AD = BD and DE = DF, and ADF and BDE are straight lines

21. ## PHYSICS

The average velocity of a plane was 600 km/h [N]. How long did it take the plane to travel 120 km? A. 0.2 min B. 5 min C. 12 min D. 5.0 h

22. ## PHYSICS-stuck

These are the troublesome questions. What is the average velocity between 0.6 h and 1 h? A. + 0.4 km/h B. + 1.25 km/h C. + 1.66 km/h D. + 2.5 km/h The other question is below. What is the object's displacemnt between 0.4 h and 0.6 h? A. -0.75 km B. +0.25

23. ## Trig

A sail boat on lake Huron leaves Southampton and sails 20degrees west of north of 20km. At the same time, a fishing boat leaves Southampton and sails 30degrees west of south for 15 km. At this point, hot far apart are the boats, to the nearest metre? ( the

24. ## chem 11

if we mix 25 g of sodium bromide with a large amount of potassium chloride, what will our theoretical yield of sodium chloride be? NaBr+KCL->NaCl+KBr how do you calculate theoretical yield?

25. ## chemistry

What is the oxidation number of PO4 in the compound Ca3(PO4)2? how do you get it?

26. ## Algebra

What does it mean to be "simplified" which one is most "simple" 2(3+5) or 6 + 10 ??? I've been told both and wonder if someone can give me the correct answer some of my teachers told me simplified means all of the operations that can be done are done and

27. ## math

A worker submits the following data on a timesheet: Week 1 – Total hours: 42 (including 4 hrs sick leave, 6 hrs travel) Week 2 – Total hours: 46 (including 5 hrs travel) What percentage of the recorded time did the worker spend traveling?

28. ## PHYSICS-Help required

My physics questions are not on graphs, this is just a practise quiz I'm doing. All the questions I've done so far were not guessed answers, I did my work on a separate piece of paper, all I really had to do was divide. The other questions above that I

29. ## PHYSICS

What is the average velocity between 0.6 h and 1 h? A. + 0.4 km/h B. + 1.25 km/h C. + 1.66 km/h D. + 2.5 km/h This questions is hard for me to understand because you can only find average velocity by dividing the displacement by the time, and here they

30. ## PHYSICS

An odometer in a car has a reading of 50 km at the beginning of a trip and a reading of 125 km half an hour later. What is the average speed of the car? A. 3.75 km/h B. 62.5 km/h C. 1250 km/h D. 250 km/h The only way to find the average speed is to divide

31. ## davao christian high school

what is the meaning of the poem, "The Singing Brook"

32. ## Physics

the engineer of a passenger train traveling at 25.0 m/s sights a freight train whose caboose is 200m ahead on the same track. The freight train is traveling at 15.0 m/s in the same direction as the passenger train. The engineer of the passenger train

33. ## Algebra

I'm kind of confused as to what exactly simplified means by deffintion which one is more simple (2x)^6 or 64x^6 I thought simplified meant to do all the operation that can be done... but I've had some teachers who've makred that wrong because I didn't

34. ## physics

A bullet with mass m and a velocity of v is shot perpendicular to the edge of a uniform rod with length L and mass 4m which is free to move and rotate on a frictionless horizontal surface. The bullet is lodged into the rod and move together after the

35. ## accounting

Mr. and Mrs. Garcia have a total of \$ 100,000 to be invested in stocks, bonds, and a money market account.The stocks have a rate of return of 12%/ year, while the bonds and the money market account pay 8% and 4%/ year, respec-tively. They have stipulated

36. ## physic

A girl throws a stone from a bridge. Consider the following ways she might throw the stone. The speed of the stone as it leaves her hand is the same in each case. Case A: Thrown straight up. Case B: Thrown straight down. Case C: Thrown out at an angle of

37. ## Physics

A certain spring stretches 6 cm when a load of 30 N is suspended from it. How much will the spring stretch if 41 N is suspended from it?

38. ## research

can anyone suggest any good food research topic please?thank you!!

39. ## Physics

"Point S1 and S2 are close sources of circular water waves each of wavelength 6.0cm. P is a point some distance away from the sources. Explain whether the following path differences (path difference = PS2 - PS1) result in nodes or anti-nodes. a) 6.0cm b)

40. ## Finance

if you bought 12,000 shares of stock at .50 per share and the stock falls to .25 per share how many additional shares would you have to buy to get your bottom line down to .25

41. ## Algebra

Which one is more "simple"? (-7(2x + 3))/(x(x + 3)) or (-14 x + 21)/(x^2 + 3x) I would go with the factored form but i'm still kind of confused as to what exactly what it means for an equation to be "simple"

42. ## PHYSICS

How long would a meteor, with a velocity of 45 km/s, take to travel 120 km through Earth's atmosphere to Earth's surface? Assume no atmospheric friction. A. 0.375 s B. 2.66 s C. 45 s D. 5400 s I say B.

43. ## Math

1.)When testing a patient’s eyes for focusing ability, one doctor uses these three cards. Card 1 is placed 3.0 m from the patient. The other two cards are placed so that the letter E on them will appear to be the same size to the patient as the E on Card

44. ## PHYSICS

It took 0.45 s for a fastball to reach the batter. If the pitcher is 18 m away from the batter, how fast was the fastball pitch? A. 0.025 m/s B. 8.1 m/s C. 18 m/s D. 40 m/s I say it is D. To let you know; this is not a test, it's only a practise quiz I'm

45. ## PHYSICS

An odometer in a car has a reading of 50 km at the beginning of a trip and a reading of 125 km half an hour later. What is the average speed of the car? A. 3.75 km/h B. 62.5 km/h C. 1250 km/h D. 250 km/h I say it's D.

46. ## Grammar

Is this sentence grammatically correct? If not how can i fix it? Those who do have what they want crave for more; they want love and affection.

47. ## EARTH SCIENCE

If the ages of Earth and the Moon are nearly identical, as believed, why are most of the rocks found on the Moon so much older than most of the rocks found on Earth?

48. ## molecular bio

do pcr generated luxAB or gel purified luxAB work better in getting white colonies? WHy? please help. thanks

49. ## Math (Re-post)

A customer wants to make a tee-pee in his backyard for his children. He plans to use lengths of PVC plumbing pipe for the supports on the tee-pee, and he wants the teepee to be 12 feet across and 8 feet tall. The customer needs to figure out the length of

50. ## Algebra I

Did I do these probelms correctly? Find the intercepts 1. y^2 = x^2 - 4x y^2 = x(x - 4) Y intercepts y^2 = 0(0 - 4) (0,0) x intercepts 0 = x(x - 4) 0 = x - 4 4 = x (4,0) 2. y = (x (x + 3))/(3x + 1)^2 y intercetps y = (0(0 + 3))/(3(0) +1)^2 y = 3/1 (0,3) x

51. ## math

there are 7 boys and 6 girls willing to serve on a committee. how many 7-member committees are possible if a committee is to contain: a) 3 boys and 4 girls b) at least one member of each sex? thank in advance!!

52. ## chemistry

How many grams of Al2(SO4)3 are there in 600 ml of (1.50)M solution

53. ## math

i need help with convering quadratics to standard form

54. ## chemistry

what are some factors that may cause a percent yield to be greater than 100% ? what are some that may cause it to be less?

55. ## chemistry

A piece of metal weighing 26g is immersed in a quantity of water in a graduated cylinder. The initial volume of the water was 16.0 ml and volume of water plus metal is 22.0 ml. The density of metal in g/ml is? If you get this right i will hand you over my

56. ## algebra1B

i have no clue how to convert quadratics to standard form can you help me with this problem? x^2-4x-38=-8

57. ## math

maria bicycles 8 km/h faster than carlos. in the same time it takes carlos to bicycle 48 km, elena can bicycle 72 km. how fast does each bicyclist travel

58. ## public health

what does it means to have high levels of lead in your blood

59. ## math

maria bicycles 8 km/h faster than carlos. in the same time it takes carlos to bicycle 48 km maria can bicycle 72 km. how fast does each bicyclist travel?

60. ## math

marcia has \$220,000 saved for her retirement. How long will it take for the investment to double in value if it earns 6% interest compounded continuously?

61. ## college

What is the basic principle that can be used to simplify a polynomial?

62. ## psychology

What influence does culture have on personality?

63. ## Eth 125

Click on the box in front of your selected answer. There is only one correct response per question. Week 5 Quiz Name: Click on the box in front of your selected answer. There is only one correct response per question. When completed, save, and post and

64. ## drawing

Assume that the aluminum atoms can be represented as spheres, as shown in the drawing (Part C figure) . If each atom has a radius of 1.43 , what is the length of a side of the unit cell?

65. ## english!

I have to compare 2 of my short stories AND write an essay and the teaacher has given me the topics to work on. 1)the use of symbols to Convery central meaning 2)The use of settings to Convey central meanings i dnt understand what they're asking. and also

66. ## Trig

a sailor out in a lake sees two likght houses 11km apart along the shore and gets bearings of 285degrees from his present position for light house A and 237degrees for light house B. From light house B, light house A has a bearing of 45degrees. How far to

67. ## ETH 125

click on the box in from your selected answer.There is only one correct response per questions. 1. which of the following statements is true about Arabs and Muslims? ac. most Muslims are not Arabs b. most Arab Americans are not Muslims c. the Arabs

68. ## math-algebra

Bayside Insurance offers two health plans. Under plan A, giselle would have to pay the first \$130.00 of her medical bills, plus 25% of the rest. Under plan B, Giselle would pay the first \$150, but only 20% of the rest. For what amount of meidcal bills will

69. ## social studies

The main landforms of Mexico are the Sierra Madres and the (a) central plateau. (b) isthmus of Panama. (c) Amazon Basin. (d) Andes.

70. ## math

I am down to 5 out of 49 problems that I can't figure out. Help is very much appreciated. Thanks ! Factor check by multiplying 9x^6y^4 + 45x^4y3 +81 xy

71. ## english

Choose two advertisements—either from television or a magazine—that draw your attention because they use semantic argument. For each ad: * Name the product * Describe the ad * List the words used as semantic persuaders * Explain what types of semantic

72. ## Math

I am down to 5 out of 49 problems that I can't figure out. Help is very much appreciated. Thanks ! Factor by grouping 35x^3 -20 x^2 + 21x -12

(6-4x-x^2)^2

74. ## Math

I am down to 5 out of 49 problems that I can't figure out. Help is very much appreciated. Thanks ! Factor by grouping: x^3 + 8x^2 -5x -40= I have (x^2 -5)(x + 8) ????

75. ## Math

I am down to 5 out of 49 problems that I can't figure out. Help is very much appreciated. Thanks ! Factor Completely 3c^2 -42c + 147= I have (w + 6) (w - 6)?????

76. ## Math

I am down to 5 out of 49 problems that I can't figure out. Help is very much appreciated. Thanks ! Factor Completely 3c^2 -42c +147 =

77. ## Math

I am down to 5 out of 49 problems that I can't figure out. Help is very much appreciated. Thanks ! Factor 64a - 49^3=

78. ## Math

I am down to 5 out of 49 problems that I can't figure out. Help is very much appreciated. Thanks ! Factor 81a^6 - 3q^6

79. ## Math Last one

I am down to 5 out of 49 problems that I can't figure out. Help is very much appreciated. Thanks ! c^2 +8c +15 =0

80. ## math

7r-3s=-17 3r+7s=59 thanks

81. ## math

last one solve by the elim method 7r-3s=-7 3r+7s=59

82. ## AED20

: Characteristics of At-Risk Students • Resources: The Online Library and Ch. 4 of Introduction to Teaching • Read p. 134 of the text, which discusses the way one school district addresses the needs of a group of at-risk students. • Choose a category

83. ## Math11U

Cos^2(theta)-3csc(theta)+2 divided by csc(theta)-1

84. ## PHYSICS

An object has an acceleration of 0 m/s squared. Does this mean that the object must be stationary. Explain. Stationary means that the object does not move. I don't think that the object must be stationary in this case because the scalar zero only tells us

85. ## health

does champva provide adequate level of health insurance for participants

86. ## math

0.25kg heavier or lighter than 220g

87. ## ECON616-1003A-04 Applied Managerial Economics

What would happen to the profit maximizing level of output if the market price suddenly rose to \$54 per case?

The length of a rectangular floor is 2 feet more than its width. The area of the floor is 168 square feet. Kim wants to use a rug in the middle of the room and leave a 2 foot border of the floor visible on all sides. What should the length (the longer

The longer the time to maturity the less the price increase from an increase in interest rates.

90. ## English

Can you please check these sentences for me? Thank you. 1)Herewith I'd like to know if it is possible to upgrade my reservation for a family room to (?) Your New Premier Club Room. 2) The total price for the two nights will then be of ..... Euros and

91. ## none

What are the names of the other burroughs in New York besides Manhattan and Bronx

92. ## Philosophy

How would Hume criticize a proof of God (St. Anselm or St. Aquinas)? 2-3 pages min 500 word essay with quotes.

93. ## essay

1000-1500 words: tell me what education means to you, and how you think it can benefit indivu=iduals and nations

94. ## essay

1000-1500words: your attitude, talents and character, how they could contribute to auniversity and a student community

95. ## Math

On a math test,12 students earned an A. This number is exactly 25% of the total number of students in the class. How many students are in the class? 'In this problem I'm not sure whether I'm being asked to solve for one or two unknowns. May I have your

The difference between the two acute angles of a right-angled triangle is 2(pie)/5 radians. Express the angles in degrees?? How to Solve it

97. ## physics

In the figure, a stationary block explodes into two pieces L and R that slide across a frictionless floor and then into regions with friction, where they stop. Piece L, with a mass of 2.0 kg, encounters a coefficient of kinetic friction μL = 0.40 and

98. ## physics

A man (weighing 915 N) stands on a long railroad flatcar (weighing 2720 N) as it rolls at 18.5 m/s in the positive direction of an x axis, with negligible friction. Then the man runs along the flatcar in the negative x direction at 55.00 m/s relative to

99. ## Calculus

Find dy/dx y=e^(4xtan2x)

100. ## trig

A 10m flagpole casts an 8m shadow at the same time of day as a building casts a 60m shadow. How tall is the building?

101. ## Math

A customer wants to make a tee-pee in his backyard for his children. He plans to use lengths of PVC plumbing pipe for the supports on the tee-pee, and he wants the teepee to be 12 feet across and 8 feet tall. The customer needs to figure out the length of

102. ## Math(trig)

A 10m flagpole casts an 8m shadow at the same time of day as a building casts a 60m shadow. How tall is the building?

103. ## social studies

8. Four major vegetation regions common to both the United States and Canada are (A)tundra, rain forest, ice cap, and desert scrub. (B)forest, desert scrub, savanna, and continental. (C)tundra, forest, grassland, and highlands. (D)ice cap, grassland,

104. ## Geometry

I;m so lost with these questiona. Any help will be appreciated. 1. Find the area of a square if one side measures 27 centimeters. 2. Exactly how many cubic inches of air can a fully inflated basketball hold if its radius is 4.2 inches? Use Pi 3. How many

105. ## American Government

if there was one fundamental element of American democracy what would it be?

106. ## History

Write a 150-200 word response summarizing the different events and causes that led to the great depression. Thank you!

107. ## IT/210

Generate a set of test inputs and expected results for the Currency Conversion program