# Questions Asked onApril 20, 2013

1. ## Physics

Consider a single photon with a wavelength of λ, a frequency of ν, and an energy of E. What is the wavelength, frequency, and energy of a pulse of light containing 100 of these photons? A)100λ, 100ν, and E B)0.01λ, ν, and 100E C)λ, ν, and 100E

2. ## Physics

a 5kg block is pushed 3m up a vertical wall with constant speed by a constant force of magnitude f applied at an angle of 30 degrees with the horizontal. if the coefficient of kinetic friction between block and wall is .3, determine the work done by a) f

3. ## Physics

Two blocks of masses m1 = 2kg. and m2 = 4kg. are each released from rest at a height of h = 5m. on a frictionless track, and undergo an elastic head-on collision. a)Determine the velocity of each block just before the collision. b) Determine the velocity

4. ## Physics

A real object is located at the zero end of a meter stick. A large concave mirror at the 100 cm end of the meter stick forms an image of the object at the 72.5 cm position. A small convex mirror placed at the 20.6 cm position forms a final image at the

5. ## statistics

r=-.96 between cravings for pizza and ability to concentrate on studying

6. ## geometry

Find the weight to the nearest kg, of the cement block. Cement weighs 1700 kg/m3. 12cm x 10cm and 40cm x 20 cm x 20cm.

7. ## History

According to King, how did the Vietnam War affect U.S. policy at home?

8. ## algerba 1

4. The total value of the \$1 bills and \$5 bills in a cash box is \$124. There are 8 more \$5 bills than \$1 bills. How many of each are there?

9. ## Chemistry

You are measuring the concentration of Fe2 in a sample by measuring the absorbance of its complex with ferroxine. Your sample, measured in a 1.00-cm pathlength cuvette, has an absorbance of 0.347 while the reagent blank in the same cuvette has an

10. ## chemistry

what is the solid remains in lithium trioxonitrate v

11. ## Chemistry

Heating an ore of antimony (Sb2S3) in the presence of iron yields antimony and iron (II) sulfide. Sb2S3 + 3 Fe = 2Sb + 3 FeS When 15g of Sb2S3 reacts with 10g of Fe in the lab 9.84g of Sb is produced. What is the limiting reactant in this reaction? What is

12. ## Math

For questions 1 and 2, use integer values of x from –3 to 3 to graph the equation. 1. y = –2x2 + 3 (1 point)

13. ## College Physics

A cubic crate of side s=2.0m is top-heavy: its CG is 18cm above its true center. Part A) How steep an incline can the crate rest on without tipping over? Part B) What would your answer be if the crate were to slide at constant speed down the plane without

14. ## chemistry

A 0.0583 mol sample of formaldehyde vapour, CH2O, was placed in a heated 0.359 L vessel and some of it decomposed. The reaction is CH2O(g)---> H2(g) + CO(g). At equilibrium, the CH2O concentration was 0.0449 M. What is the value of Kc for this reaction? my

15. ## accounting

Ziegler Corporation purchased 25,000 shares of common stock of the Sherman Corporation for \$40 per share on January 2, 2010. Sherman Corporation had 100,000 shares of common stock outstanding during 20 I3, paid cash dividends of \$120.000 during 20 I3, and

16. ## chemistry

reaction of benzoic acid with propylamine. if there no reaction why

17. ## Physics

The cannonball is fired at a speed of 45 and an angle of 35 . A cannonball that was accidentally dropped from the top of the castle wall hit the moat below in 1.8 .

18. ## life orientation

identify one environmental or human factor that causes ill health,accidents,crises and disasters within the community and critically discuss five ways which the human or environmental problems impacts on the community

19. ## chemistry

A car uses 114 g of petrol to travel one mile. Calculate the mass of carbon dioxide produced when this car travels one mile.

20. ## math

1. Ms.lynch has 21 coins in nickels and dimes. Their total value is \$1.65. How many of each coin does she have? 2. A vending machine that takes only dimes and quarters contains 30 coins, with a total value of \$4.20. How many of each coin are there?

21. ## Economics

Explain how market research helps producers maximize profits

22. ## College Physics

A uniform ladder of mass, m, and length, l, leans at an angle, theta, against a frictionless wall. Determine a formula for the minimum angle at which the ladder will not slip.

23. ## calculus

6. The forward motion of a space shuttle, t seconds after touchdown, is described by s(t) = 189t − t^3 , where " is measured in metres. a) What is the velocity of the shuttle at touchdown? b) How much time is required for the shuttle to stop completely?

asked by I JUST NEED TO KNOW D
24. ## presential esential

Explain why academic and professional research must use credible sources.

25. ## Daycare managment

1. Which of these is a benefit of unstructured outdoor play? A. Learning of rules B. Emotional well-being C. Video game skill D. Learned helplessness 2. Children are considered obese when they're ______ percent over their ideal body weight. A. 15 B. 10 C.

1. Which equation represents a nonlinear function? (1 point) y = x + 7 y = 3x – 1 y = 3x2 + 1 y = x – 1/2 Is the answer "y = 3x - 1"?

27. ## College Physics

A large 61.0 kg board is propped at a 45 degree angle against the edge of a barn door 2.9m wide. How great a horizontal force must a person behind the door exert (at the edge) in order to open it? Assume that there is negligible friction between the door

28. ## math

a boat leaves a dock at 2:00pm ,heading west at 15 km/h. another boat heads south at 12km/hand reaches the same dock at 3:00 pm, when were the boats were closest to each other.? tanks it will be help full if its explained well .

29. ## math

The second of two numbers is 7 times the first. Their sum is 72. Find the numbers.

30. ## chemistry

How many grams of NaCl must be added to 225.0 g of H2O at 45 °C to lower the vapor pressure of water by 2.21 mmHg? The vapor pressure of pure water is 71.93 mmHg at 45 °C.

31. ## health

Provide recommendations on how to adress cancer

32. ## US HISTORY

During the 1950s, the Central Intelligence Agency engineered pro-American political coups in both A.)Iraq and Nicaragua B.)Libia and Costa Rica C.)Lebanon and El Salvador D.)Iran and Guatemala E.)Eqypt and Cuba

33. ## Statistics

A die has one red face, two blue faces, and three green faces. It is rolled 5 times. Find the chance that the red face appears on one of the rolls and the remaining rolls are green. [Careful what you multiply. The most straightforward method is to follow

34. ## chem

If 10.4 liters of O2 at STP are produced by the electrolysis of water, how many coulombs of charge were required?

35. ## Physics

In two successive chess moves, a player first moves his queen four squares forward, then moves the queen three steps to the left (from the player’s view). Assume each square is 4.0 on a side.

36. ## calculus

the demand for a certain type of auto tire is given by x=f(p) 50(1+e^-p/60). a)if the weekly quantity demanded is 60000 tires find the price? b)if the current price is \$120 per tire and is increasing at a rate of \$2 per week, what is the rate of change of

37. ## geometry

Quadilateral KLMN is enlarged by a factor of p.Find the largest value of p for which the image of KLMN is contained in the circle centered at (0;0) with radius 1

38. ## Physics

A 3 cm flower is placed 40 cm from a converging lens with a focal length of 15 cm. What are the orientation, size and type of the image?

39. ## algerba 1

1. the sum of 3 numbers is 207. the 2nd # is 8 times the first, while the third is 3 less than the first. find the #s. 2. the sumof 3 numbers is 161. the second number is 6 times the first, and the third is 5 more than the second. find the #s. Thanks so

40. ## Physics

A capacitor of capacity C is charged fully by a cell of emf V/2 and then it is disconnected and again connected with a cell of emf V (+ve plate of capacitor with +ve terminal of cell and vice versa). The heat developed in connecting wire during charging by

41. ## Math

what is the longest river in the world?

42. ## Agricultural science

Outline and explain the objectives of fencing a farmland.

43. ## Chemistry

An alloy contains 39.5 mass% silver (Ag) and has density og 7.86 g/ml What volume of alloy would be needed to contain 12.0g of pure Ag?

44. ## chemistry

At high temperature, 2.00 mol of CH2O was placed in a 4.00 L container where it decomposed via the equilibrium CH2O(g)CO(g)+H2(g) . At equilibrium, the concentration of CO was measured to be 0.0317 M. What is Kc for this reaction at this temperature?

45. ## Math

The size to which a pumpkin grows while on the vine is probably problematic, as our current visiting POLY pumpkins demonstrate. What if we were watching a pumpkin on the vine grow over time and that its shape was totally spherical. Now for your five (5)

46. ## Ap bio

Triiodobenzoic acid (TIBA) inhibits auxin transport. If a tiny agar bead containing TIBA were placed off center on the tip of an intact coleoptile, which way would the coleoptile bend: toward the side of the bead or away from it?

47. ## phisic

(a) One such reaction fuses two nuclei of carbon-12 (12/6C ) to form an atom of neon (20/10Ne ) with the emission of an α-particle. Write an equation for this process, indicating the atomic number and mass number of each of the products in the usual way.

48. ## life orientation

Provide 5 ways in which you critically discuss how life style in the legal n illegal drugs among the youth

49. ## Life orientation

Provide recommendations on how to address this enviromental problem.

50. ## statistics

some 24% of the men compared to 62% of the women responded yes suppose that 150 women and 200 men were interviewed construct a 95% confidence interval

51. ## Urgent math

If f(x, y, z)=sin(3x-yz), where x=e^(t-1), y=t^3, z=t-2, what's df/dt(1)? x(1)=1 y(1)=1 z(1)=-1 df/dt=(3cos(3x-yz))(e^(t-1))+(cos(3x-z))(3t^2)+(cos(3x-y))(1) I seriously need help on this and tell me the answer and show your work through steps. Thanks.

52. ## Agricultural science

Draw a diagram to show the arrangement of poles at a corner or where a fence changes direction.

53. ## Agricultural science

Describe how a farmer would maintain a laying flock in one of the systems you have named and use these headings:Housing,Feeding,and Maintenance of Health.

54. ## Algebra 1-2

Jack is making square pillows for his room. He is using different fabric for each face, one width a width of 80 inches and the other with a width of 48 inches. What is the length of one side the largest pillow he can make if all the pillows are the same

55. ## Grammar

If I were or If I was Rules???

56. ## US HISTORY

In return for the old American destroyers, the British gave the USA A.) six air bases in Scotland and Iceland. B.) a role in developing the atomic bomb. C.)"most favored nation" status. D.)access to German military codes. E.)eight valuable naval bases.

* JJ Thomson * a) How does his experiment of cathode ray tube relates to electrostatics? >> PLEASE HELP ME!! :( :)

58. ## COOP Exam?? (practice)

Is there any online COOP exam I can practice to pass that COOP exam I'm taking (I'm applying to catholic high school. It's a private school). This what it will be on the exam: Test 1 Sequences This test measures the student’s ability to comprehend a rule

59. ## Math

9 fair coins are independently tossed in a row. Let X be the random variable denoting the number of instances in which a Head is immediately followed by a Tail during these 9 tosses. The variance of X has the form ab, where a and b are coprime integers.

60. ## algebra

A poll was taken of 100 students at a commuter campus to find out how they got to campus. The results were as follows: 26 said they drove alone. 34 rode in a carpool. 34 rode public transportation. 7 used both carpools and public transportation. 6 used

the question is: "The absolute magnitude of a star is -12.. How would you describe its brightness?"

62. ## theology class????

I'm Christian and I'm applying to a catholic high school (due to the budget cuts in my district). The thing is that I'm required to take theology (Religion class) for four years of high school. ... I'm just wondering, it's theology interesting, fun... and

63. ## Physics

A hockey puck of mass .2kg is sliding down an inclined plane with an angle of 15 degrees to the horizon. If the puck is moving with a constant speed, what is the coefficient of kinetic friction between the puck and the plane?

64. ## Life orientation

Community organizations that are involved in supporting or giving redress to these disasters.

65. ## medical terminologhy

combining form and suffix to form number 1 abnormal softining of a kidney

66. ## Math

Selma went to the mall spent 1/3 of her money. she then lost 1/2 of what she had left. she then had \$6. how much money did selma originally have.

67. ## calculus

If x=t^3 and y=3t^5, where t is any real number, what is the derivative of y with respect to x at x=125 ?

68. ## Geometry

There are 100 runners, each given a distinct bib labeled 1 to 100. What is the most number of runners that we could arrange in a circle, such that the product of the numbers on the bibs of any 2 neighboring runners, is less than 1000?

69. ## Trig

This has to do with vectors...I'm wondering if I set up the diagram correctly? A plane has a speed of 250mph and flies with a bearing of N35degE. The wind is blowing from the west at 25 mph with a heading of due east. What is the actual speed and heading

70. ## chemistry

given that thee density of a supplied vinegar solution in an experiment is 1.025g/ml, what is the percentage acetic acid found in the vinegar sample?

71. ## Chemistry

A marathon runner will burn 1.25x10^7 j during a race. If the calorie content of 12.0 oz. of Gatorade is 80.0 kilocalories, how many ounces of Gatorade must the runner drink to provide enough energy for the race? Note: 1 Calorie=4.184j and "kilo"= 10^3

72. ## finance

"You are told you will receive the following cash payments at the end of the next three years: Year 1: \$10,000 Year 2: \$25,000 Year 3: \$50,000 Assuming a discount rate of 12%, what is present value of all payments?"

73. ## calculus

Use logarithmic differentiation to find the following derivative: y=(x+6)^4/(x-5)^6. Please show all step so I can understand for future reference.

74. ## Calculus

Consider the function f(x)=xe^2x. Find the intervals on which f(x) is concave up and the intervals where it is concave down. Show a sign graph. Please show work in detail so I can follow for future reference. Thanks!

75. ## Agricultural science

Outline and explain the objectives of fencing a farmland

12E − 4 = 0

77. ## Math

Sam wants to build a table with that triangular top. If that tabletop has a height of 4 feet and a base of 3.5 feet, what is the area of this triangular surface

78. ## Life orientation

8 ways in which ill health impact on the community

79. ## Physics

In two successive chess moves, a player first moves his queen four squares forward, then moves the queen three steps to the left (from the player’s view). Assume each square is 4.0 on a side.

80. ## Geometry

A circle of radius 1 is drawn in the plane. Four non-overlapping circles each of radius 1, are drawn (externally) tangential to the original circle. An angle ã is chosen uniformly at random in the interval [0,2ð). The probability that a half ray drawn

81. ## L.o

What are human/environmental problems impacts on the community

82. ## Math

9 fair coins are independently tossed in a row. Let X be the random variable denoting the number of instances in which a Head is immediately followed by a Tail during these 9 tosses. The variance of X has the form a/b, where a and b are coprime integers.

83. ## Algebra

Write the function whose graph of y=(x+4)^2, but is reflected about the y axis. y=

84. ## Physics "scientists"

* JJ Thomson * a) How does his experiment of cathode ray tube relates to electrostatics? >> PLEASE HELP ME!! :( :)

85. ## science

To get an A grade on the test, you need a total score of more than 16 points. One of the students knows the correct answer to 6 of the 20 questions. The rest she guesses at random by tossing a coin (one toss per question, as in 4B). What is the chance that

86. ## Statistic

To get an A grade on the test, you need a total score of more than 16 points. One of the students knows the correct answer to 6 of the 20 questions. The rest she guesses at random by tossing a coin (one toss per question, as in 4B). What is the chance that

87. ## Calculus

Consider the function f(x) = x - lnx. Find the intervals on which f(x) is increasing and the intervals where it is decreasing. Also determine any relative max or min.

88. ## accounting

2. Cindy Lou makes \$30,000 per year as an exempt employee. She worked 15 hours of overtime in the month of September. Payday for wages earned in the month of September is October 7. Ignoring Federal and State income tax withholdings, how much would she

89. ## Chemistry

What is the number of ATP molecules produced by the beta oxidation of eicosanoic acid?

90. ## english

I will call you before i leave for station.Leave only after i call. ans : If I do not ... ... .... .... ... .... . will you please write the correct form ?

91. ## math

Suppose that a vegetable vendor pays 7% interest daily on a \$10 loan. Then, suppose that this individual was able to save \$0.50 per day by drinking less tea. Calculate the number of days it would take for the vendor to no longer need to borrow money in

92. ## For the given functions f and g

For the given functions f and g, find the following and state the domain of each result. f(x)=sqrtx;g(x)=5x-9 (a) (f*g)(x)= What is the domain of f*g? (b) f/g(x)=

93. ## math

How would I solve this: Mr. Merrill has 3 times as many nickels as dimes. The coins have a total of \$1.50. How many of each coin does he have?

94. ## Algebra

I have to compute the determinant of the matrix without using a calculator. If the determinant is zero, write singular matrix. 1 -1 -1 -4 2 0 0 3 1

95. ## Algebra

If the sum of 3 non-zero distinct real numbers a, b and c is 2 , and the two sets {a,b,c} and {1/a ,1/b ,1/c} are the same, what is the value of a^2 +b^2 +c^2 ?

96. ## Chemistry

Could somebody please explain why in gaseous reaction the collision frequency between molecules is far greater than the rate at which molecules react? Thanks! :)

97. ## Psychological Statistics

A researcher asks participants to sample tap water and bottled water. out of 40 people, 28 selected bottled water. was the bottled water selected significantly more often? Use two tailed test with a+.05

98. ## L o

Identify three environmental health hazards that cause ill health

99. ## Physics

In two successive chess moves, a player first moves his queen four squares forward, then moves the queen three steps to the left (from the player’s view). Assume each square is 4.0 on a side.

100. ## math

What is the surface area of a circle that has a diameter of 14 inches?

101. ## Life Orientation

Identify and describe one environmental problem that causes ill health,accidents,crises,and disasters within your community or any other community within South Africa or globally.

102. ## Life Orientation

Identify and describe one environmental problem that causes ill health,accidents,crises,and disasters within your community or any other community within South Africa or globally.

* JJ Thompson * * what was he credited for discovering the cathode ray tube? * How does his experiment relate to electrostatics? >>PLease help me!!!! :)

104. ## westonaria high school

Critically discuss 6 Ways in which the drought can impact negatively in one's health

105. ## Physical science

To investigate whether the amount of heat produced will depend on an increase on the concentration of HCL when HCL reacts with an excess Zn

106. ## orchestra programs????????

orchestra programs for teens in rockland county??? like a group of teens playing songs and they perform it (concert)

107. ## MATH HELP!!!!!!!!!!

If the first bell is at 8:12 but the all the buses are at the school at 8:00 (around 8:05 they let all the students out of the bus). It's takes 41 minutes from home to get to school. What time does your bus comes in the morning and what time you have to

108. ## finance

You won a lottery which pays \$10,000 per year for 10 years (at the end of each year). Assuming a discount rate of 8% calculate the present value of your expected winnings.

109. ## Calculus

Use logarithmic differentiation to find derivative of y=x^x^2 x > 0. Please show all steps so I can follow the steps. Thank you.!

110. ## real estate finance

Jay has an annual income of \$50,000. He would qualify for a \$__________ monthly payment for housing + other long-term debt on an FHA loan. I have the GMI, but I'm not sure as to how to find the monthly payment. Do I multiply the GMI by 28% in order to get

111. ## Agricultural science

State and explain what records should be kept for the efficient management of a dairy herd.

112. ## english

can you tell me how to begin a sentence with BECAUSE :eg. My sister fell down and thought she had broken her leg.she went to the doctor .ans: Because... ... ... ... ... ... ...

113. ## US HISTORY

The NSC-68 documentreflected the American Belief A.)that military spending would help the ecomony B.)that huge sacrifices would be needed by Americans to fight the cold war C.)in our limitless capabilities D.)that we needed help to fight the spread of

114. ## Calculus

find an equation of the tanegent line to the curve 3xsquared + 5ysquared=8 at the point (1,1)

115. ## Trig

This has to do with dot products (I can't make the arrow above the u, i, or j). Given u = 4i - 6j and v = -3i + 5j, find 4u-(1/2)v Am I just supposed to plug in what u and v are equal to in 4u-(1/2)v? If so, is the answer (35/2i - 53/2j)

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117. ## Physics

In two successive chess moves, a player first moves his queen four squares forward, then moves the queen three steps to the left (from the player’s view). Assume each square is 4.0 on a side.

118. ## Math

Stuart needed to purchase cleaning supplies for his company. He purchased 15 rolls of paper towels for \$0.65 each, 15 bottles of cleaning solution for \$1.25 each, 4 containers of garbage bags for \$2.45 each and 3 new mops for \$6.98 each. He received a 15%

119. ## LO Assignment

Provide 5 (or more) ways in which you critically discuss how lifestyle of lung cancer impacts on the teenager?

120. ## Literary terms

What is the literary term when something serious is happening and there is humor?

121. ## Agricultural science

Outline and explain the objectives of fencing a farmland.

122. ## life orientation

Identify and describe 3 environmental health that cause ill health, crises and or disaster within your community or any any other community within south africa and globally. Include evidence that is current of the identified issues. Use graphs, statistics

123. ## mathURGENT!!!!!!!!!!

if 4^(x)-4^(x-1)=24 what is the value of (2x)^x? please answer and explain step by step how u got it... PLEASE?????

124. ## Agricultural science

What are the important features of a building which could be used as a milking shed(parlour),dairy(milk room)and food store to ensure production of clean fresh milk?

125. ## Agriculral science

Explain how any three of these records should be used to improve management.

126. ## Agricultural science

From your research on poultry farming,name one intensive and one extensive system of poultry keeping(farming).

127. ## algebra

p varies jointly as u and B^2 when u = 4 and B = 5, P = 300. find P when u is 1 and Bis 11

128. ## Math

When f(x)is divided by x-1 and x+2,the remainders are 4 and -2 respectively . Hence find the remainder when f(x)is divided by x^2+x-2 .

129. ## english

can PROD rhyme with LORD in phonetics

130. ## english

which one is the actual noun form : aborigines/aborigine/aboriginality please let me know clearly

131. ## life orientation

lyf style of hiv and aids

132. ## World History

What policies affected the citizens during the 21st century? For example: In the U.S. we had the Homeland Security Policy

how can you study before time for exams i am unable to do please give me study tips

134. ## physics

What is the rotational kinetic energy of a planet about its spin axis? Model the planet as a uniform sphere of radius 6000 km, and mass 6.21 x 10^24 kg. Assume it has a rotational period of 24.0 h.

135. ## Agricultural science

What types of fences can be used?

136. ## Language Arts

How are video games educational? Can you list some ideas?

137. ## geocaching

find 2 distinct palidromes

138. ## english

My kids ______ with joy when they got their marks (squealed/exclaimed)which is the correct one

139. ## mathURGENT!!!!!!!

if (4^x)-(4^x-1)=24 what is the value of (2x)^x? please answer and explain step by step how u got it... PLEASE?????

140. ## Life orientation

Critically discuss 5 ways in which the human envornmental(smoking)problem impacts on the community.provide relevant sources to support your claims.

141. ## landmarks

how did Palace Of Fine Arts got its name

142. ## Calculus

Consider the function f(x) e^x-1/2x^2. Find all points of inflection if they exist. Please show sign graph and show work in detail so I can follow for future reference. Thanks.

143. ## Agricultural science

Describe how a farmer would maintain a laying flock in one of the systems you have named and use these headings:Housing,Feeding,and Maintenance of Health.

144. ## life orientation

how does cancer impact on the teenager?

145. ## L.o

5 ways in which the human problem impacts on the community

146. ## L.O

5 ways in which the human or environmental problem impacts on the community.