# Questions Asked onJune 28, 2011

1. ## Chemistry

Consider the combustion of liquid methanol, CH3OH (l) CH3OH (l) +3/2O2 (g) = CO2 (g) + 2H2O(l) H = -726.5 kJ What is for the reaction represented by this equation? Express your answer using four significant figures

2. ## Physics

A frog in a hemispherical bowl, as shown below, just floats in a fluid with a density of 1.26*10e3 kg/m3. If the bowl has a radius of 6.16 cm and negligible mass, what is the mass of the frog?

3. ## Chemistry

Energy, q, w, Enthalpy, and StoichiometrySource(s): Consider the combustion of liquid methanol, CH3OH (l). CH3OH (l) +3/2O2 (g) = CO2 (g) + 2H2O(l) H = -726.5 kJ Part A: What is the enthalpy change for the reverse reaction? Express your answer using four

4. ## physics

A satellite explodes in outer space, far from any other body, sending thousands of pieces in all directions. How does the linear momentum of the satellite before the explosion compare with the total linear momentum of all the pieces after the explosion?

5. ## physics

a skater holds her arms outstretched as she spins at 140 rpm. What is the speed of her hands if they are 125 cm apart?

6. ## Physics

Hey, it's me again, Can someone help me with this question? A water balloon is dropped from the top of a building. Assume the balloon does not break when it strikes the ground. If the water balloon falls a distance of 21m, what is the maximum temperature

7. ## statistics

Assuming that the weights of newborn babies are normally distributed with mean 6.5 pounds and standard deviation 1.2 pounds, how many babies in a group of 80 do we expect to weigh more than 8.9 pounds? Please show work Thank you

8. ## Chemistry

Consider the combustion of liquid methanol, CH3OH (l) CH3OH (l) +3/2O2 (g) = CO2 (g) + 2H2O(l) H = -726.5 kJ What is for the reaction represented by this equation? Express your answer using four significant figures

9. ## phtsical science

Which has greater momentum, a 2.0kg hockey puck moving east at 2.5m/s or a 1.3kg hockey puck moving south at 3.0m/s?

10. ## physics pls help

A sound source producing 1.00-{\rm kHz} waves moves toward a stationary listener atone-half the speed of sound. The frequency that the listener will hear is2000 Hz. when the source is stationary and the listener moves towardthe source at one-half the speed

11. ## math

in a distribution of 160 values with a mean of 72,at least 120 fall within the interval 67-77. approximately what percentage of values should fall in the interval 62-82? use chebyshev's formula.

12. ## physical science

A marble is rolling at a velocity of 1.5 m/s with a momentum of 0.10 kg m/s. What is its mass?

13. ## physical science

A object that has a mass of .25kg is moving with a momentum of 5 kg„ªm/s. What is its velocity?

14. ## Physics

A 5 kg ball is initially at rest at the top of a hill 10m high. If it rolls down the hill (converting all of its potential energy to kinetic energy,) what is the maximum kinetic energy it could have at the bottom of the hill? -I am not sure what formula to

21. ## science207

How much would be appropriate for wealthy countries to contribute to global health? Why should we do more than we do now? What’s in it for us?

22. ## Math

There are 5 red marbles, 8 blue marbles, and 12 green marbles in a bag. What is the theoretical probability of randomly drawing a red marble?

23. ## godby

Fernando is going to draw a marble from the bag, replace it, and then draw another marble. What is the probability that Fernando will get a green or blue marble on the first draw and a pink on the second draw?

24. ## Physics

In an intense battle, gunfire is so intense that bullets from opposite sides collide in midair. Suppose that one (with mass M= 5.12 g moving to the right at a speed V= 214 m/s directed 21.3 degrees above the horizontal) collides and fuses with another with

25. ## physical science

A steel ball whose mass is 2.0 kg is rolling at a rate of 2.8 m/s. What is its momentum?

26. ## physics

An object is thrown upward at v0 from the surface of a small spherical planetoid of mass M and radius R When the object is a distance R above the surface, how fast is it moving in simple terms of v0, R and M?

27. ## English

Okay, another question on the Diary Of A Young Girl by Anne Frank. In the book, Anne says this statement: "There is nothing we can do but wait as calmly as we can till the misery comes to an end." How does this statement help to place readers in the

28. ## science207

Why do you think controlling greenhouse gases is such a difficult problem? List some of the technological, economic, political, emotional, and other factors involved. Whose responsibility is it to reduce our impacts on climate?

29. ## statistics

Weights of a certain model of fully loades gravel trucks follow a normal distrbution with mean = 6.4 tons and standard deviation = 0.3 ton. Waht is the probability that a fully loaded truck of this model is a. less than 6 tons? b. more that 7 tons? c.

30. ## Chem

How would I make a 0.25M solution of sodium bisulfite?

31. ## physical science

When you are driving a golf ball, a good follow-through helps to increase the distance of the drive. A good follow-through means that the club head is kept in contact with the ball as long as possible. Why does this technique allow you to hit the ball

32. ## alg 2

A rectangular plot is 30 feet long and 20 feet wide. The area will be doubled by adding a strip at one end and another strip of the same width on one side. What would be the width of the strip?

33. ## mathmm

How to make a sign diagram

34. ## economics

1. why is the subject of managerial economics relevant to problem of global warming? 2.explain with examples why it is important for managers to have good theories

35. ## English

How would you interpret the messages in the poem Anne received from her father for her birthday? I read them, but don't understand at all.. of course it makes sense I don't understand.. I am a 10 year old doing a 13 year old's work because I skipped a few

36. ## physics

if a 5microfarad capacitor is charged by a 20volts battery and it is then connected across an uncharged 20microfarad capacitor , find the potential energy

37. ## calculus

After x weeks of prcatice, a student can type f(x)=80(1-e^-0.3x)words a minute. How sooon will the student be able to type 60 words per minute? (Round to the nearest tenth)

38. ## Pre-Calculus

Which one of the following situations would have a graph that is a constant function? (5 points) (Points : 5) The amount of money that someone earning \$10.75 per hour would make The total number of days in September each year The amount of rainfall in New

39. ## physics

a car is traveling with a speed of 15 m/s on a stratight horzontal highway. the wheels of the car have a radius of 50cm.if the car then speeds up with an acceleration of 2 m/s for 5s, find the number of revolution of the wheels during this period.

40. ## TRIGONOMETRY

CSC - COS X COT = SIN

41. ## Derivatives

a pationt recives an injection of 1.5 milligrams of a medication, and the amount remaining in the bloodstream t hours later is A(t)= 1.5e^-0.08t .find the instantaneous rate of change of this amount: a) Immediately after the injection (time t=0)

42. ## Trigonometric Substitution

Trigonometric Substitution a. Explain why the substitution x = asin(Theta) guarantees that cos(Theta) is greater than or equal to 0 . b. What sort of restriction must we put on x and a so that the substitution x = asec(Theta)will guarantee that tan(Theta)

43. ## Geography

Do you think that the British influence in India was positive or negative? Explain your answer. I think that the British influence in India was both positive and negative. They helped ge the country on track by doing things such as ending slavery,

44. ## statistics

1. A researcher is interested in comparing the effectiveness of three different kinds of therapy for anger problems. Eight participants are randomly assigned to three treatment conditions: Cognitive Therapy (CT), Cognitive-Behavioral Therapy (CBT), and

45. ## chem

For a mixture of two gases, consisting of 1.00 mol of N2 and 1.00 mol of CF4, at a total pressure is 2.04 atm, what is the partial pressure of N2?

46. ## physics

In an experiment similar to that done by Michelson,the frequency of rotation of the eight-sided mirror is 530 Hz. Calculate the speed of light in air if the distance from the rotating mirror to the stationary mirror is 35.0 km.

47. ## physical science

When you are driving a golf ball, a good follow-through helps to increase the distance of the drive. A good follow-through means that the club head is kept in contact with the ball as long as possible. Why does this technique allow you to hit the ball

48. ## english

Alright, I am also reading Anne Frank, but I'm having trouble with the question about how Anne used humor to relieve the anxiety and boredom of living in the hiding?

49. ## Chemistry

3) You make a solution by dissolving 3.4g Ba(OH)2 in enough water to make 450ml of salt solution. a. What is the molarity of the solution?

A builder constructed a house according to plans provided by the owner. The contract specified that only Reading brand pipe was to be used in the plumbing. After the house was built, the owner discovered that another brand of pipe had been used. The owner

51. ## CALCULUS

FIND EACH INDEFINITE INTERGRAL (X^2+1)^9 X DX

52. ## accounting

Recording federal income tax transaction and cash dividend transactions. What annual per share dividend was paid to common stockholders in 2010? May 15-

53. ## PHYSICS

Which machines has more mechanical advantage pulley or incline plane? I asked this question before but did not quite understand the answers that were given to me. I think that the incline plane has more mechanical advantage in a friction less environment.

Copenhaver put pay washers and dryers in an apartment complex owned by Berryman. With four years to run on the contract, Berryman kicked Copenhaver out. Within 6 months, Copenhaver had put all equipment back into service in other locations. Copenhaver sued

55. ## English

Thank you very much for your help.I need you to check these sentences, please. 1) He plays more sports than Keith. Will you have to take a make-up exam at the end of Agust? 2) As our flight is due to land in London in the late evening, I wonder how far

56. ## chem

Calculate the volume of hydrogen produced by the electrolysis of 54.0 mL of water at 27.°C and 1.3 atm, using the ideal gas approximation.

57. ## MAT117

During the first part of a trip, a canoeist travels 68 miles at a certain speed. The canoeist travels 16 miles on the second part of the trip at a speed 5 mph slower. The total time for the trip is 3 hrs. What was the speed on each part of the trip?

58. ## geometry

determine the length of the sides and the measures of the angels for the congruent quadrilaterals ABCD and A'B'C'D' there are 2 diagrams but don't know how to show it to you

59. ## Physics

A winch with a power rating of 400 W lifts a 200kg object off the ground at a constant velocity for 17 seconds. How high was the object lifted? What is the object total energy? Please indicate which equation you use, what variable corresponds to each

60. ## world geography

why did the south agrican government change its policy of apartheid in 1990 and 1991

61. ## government

1. The _____ Act mandated that at least some federal employees be chosen on the basis of merit instead of political connections. Federal Employment Pendleton Bureaucratic Fairness Civil Service 2. The cooperation between interest groups, federal agencies,

62. ## Psychology

Dr. Kyle shared the newspaper clipping with his class. "This is an unusual case, but I believe the punishment phase of the trial would have been different in another state. The crime was committed, but the defendant is not in touch with reality most of the

63. ## physics

In Physics, it is important to use mathemat- ical approximations. For instance, in a small angle approximation, tan α ∼ sin α . Find the largest angle α for which the dif- ference of sin α − tan α is less than 3.52% of the sin α value.

Hi I need help with this What classical institutions survived the collapse of the classical civilizations and why? I just need help with knowing Romes institutions please help.

65. ## algebra

Write in Simply form: Can you help? 6x^2+13x+6/3x^2+x-2=

66. ## English

I need help finding a word that means "to make greek" using "hellen" as the base

67. ## matha

my one digit is 4.my tens i 3 plus my ones digit.my hundredsdigit is 7 less than my thousands digit.my thousands digit is 8.what number am i?

68. ## CALCULUS

FIND EACH INDEFINITE INTERGRAL BY THE SUBSTITUTION METHOD (X^4-16)^5 X^3 DX

69. ## CALCULUS

FIND EACH INDEFINITE INTERGRAL BY THE SUBSTITUTION METHOD DX/1+5X

70. ## PHYSICS

Does mass affect mechanical advantage in any way?

71. ## History

What was the nature and extent of the Umayyad Empire?

72. ## IT

Can anyone tell me which WIMAX system you would use for last mile broadband ? with a link to a town the miles away ??? Mobile or fixed ??? Thnks

73. ## History-Civil War

1865: Marching through Georgia In terms of supply, how was Sherman"s march different than other Civil War campaigns? What I found was..Sherman telegraphed President Lincoln, asking him as a gift to Savannah, he would need 150 guns along with plenty of

74. ## Physics

1. if a 0.05kg coin is hanging from 22m above the ground: a. If you drop it, how fast will the coin be moving halfway to the ground? b. How fast will it be moving just before it hits the ground? If you could point me the right direction with equations that

75. ## Public health

Why is epidemiology important in the study of health and disease in communities?

76. ## technology

Should there be any limitations on linking. If not, why not? If so, which limitations should be in place and why?

77. ## calculus

How to make a sign diagram

78. ## calculus

The point of inflection for graph x^3/3-x^2-3x+7 I cannot seem to find it as stated.

79. ## chemistry

how much heat would it take to raise the temperature of 52.0 grams of water from 22.0 degrees celcius to 100.0 degrees celcius

80. ## PHYSICS

When you have more pulleys does the mechanical advantage and efficiency increase or decrease?

81. ## Algebra 1

Solve. y=2x - 7 3x - 4y=8

82. ## Algebra 1

Solve. 3x - y=4 2x - 3y= - 9

83. ## English

I left out a few sentences.Thank you for your cooperation. 1) Do/take an exam 2) Have a holiday/go on holiday/go to London for my holiday. 3) go for a bath (in the sea, at the swimming pool),take a bath (at home), take/have a shower. 4) Don't ride your

84. ## CALCULUS

FIND EACH INDEFINITE INTERGRAL BY THE SUBSTITUTION METHOD çX^3+X^2/3X^4+4X^3 DX

I=Prt,for t

86. ## Algebra 1

Find the coordinates of the vertex of the graph y= -x^2+2

87. ## english

Example of literary and non literary prose by citing example?

88. ## biology

How do c3, c4, and CAM plants survive under dry conditions?

89. ## CALCULUS

FIND EACH INDEFINITE INTERGRAL (X^2+1)^9 2X DX

90. ## math

Will the three segments given below form a triangle? Explain why or why not. AB=1 INCH BC=2 INCHES AC=3 INCHES

91. ## philosophy

In "Some Moral Minima," Lenn Goodman argues that there are certain things that are simply wrong. Do you think Goodman is right? Using specific examples, explore the challenges Goodman presents to relativism. Determine whether you think there are such

92. ## CALCULUS

FIND EACH INDEFINITE INTERGRAL BY THE SUBSTITUTION METHOD ç(X^4-16)^5 X^3 DX

93. ## biology

Describe how the human defense line work.

94. ## poetry

I need help scanning "Combing"

95. ## English

Can you please check these expressions? It's really urgent. The first set of expressions concerns husehold chores whereas the others refer to what you have to do when you do the washing. 1) I have to clean the bathtub, the sink and the toilet, dry the

96. ## calculus

how do you find the absolute maximum of 2x^3+3x^2-12x-7 on interval (-3,0)

97. ## CALCULUS

FIND EACH INDEFINITE INTERGRAL BY THE SUBSTITUTION METHOD X^3+X^2/3X^4+4X^3 DX

98. ## calculus

I need to find the dy/dx of x^2ln(x^2)I tried to do it the way I thought, but it did not come out right.

99. ## calculus

I see that someone else on here had the same problem, I wanted to find the solutions for 5xe^x+1 but its not really an equation.

100. ## Calculus

FIND EACH INDEFINITE INTERGRAL BY THE SUBSTITUTION METHOD çe^3X DX

101. ## Psychology

• Write a 200- to 300-word response to the following: Identify and explain the scientific process (unsystematic observation, building theories, and evaluating propositions) as applied to personality psychology.

102. ## physics

A 1,200-kg car runs into the rear of an 1,800-kg minivan that was moving at 6 m/s. The two vehicles are locked together after the collision and move with a speed of 12 m/s. How high above the ground would the locked- together vehicles have to be raised in

103. ## Physics

A 30kg block sits on a ramp, with Θ=47. The ramp is 13m off the ground at the tallest point. If the block slides in the presence of friction, with μ=0.1, how fast is the block moving when it hits the bottom of the ramp? Please indicate which equation you

105. ## science

is sulphur a good conductor of electricity

106. ## Chemistry

3) You make a solution by dissolving 3.4g Ba(OH)2 in enough water to make 450ml of salt solution. a. What is the molarity of the solution?

107. ## Calculus 2

Use the Midpoint Rule to approximate the integral (–10x+(7(x^2))) from 10 to 17 with n=3

108. ## English

Did I properly quote this sentence? Feldman is the author from my school textbook. I am not sure if I have this part right. Do I include the authors' name within the brackets() are do I leave out the author name and just put brackets around the year and

109. ## CALCULUS

FIND EACH INDEFINITE INTERGRAL BY THE SUBSTITUTION METHOD e^3X DX

110. ## Calc I

I need to find the equations of the tangent and normal line for x^2-y^2=16, at the point (-5,3). I have to show every detail for my work...then use graphing software to enter my equations, so can anyone help me showing all the details of the work so that I

111. ## English

One last question for today that I need checked. What can you assume about the effective-ness of the efforts of Dutch resistance work-ers to sabotate the Nazis? I just put it was very effective, but I feel that it's asking for more in the question, and

112. ## health care

by creating a committe on social welfare, the American Association of Labor Legislation helped to?

113. ## calculus

2x^3+3x^2-12x-7 the absolute maximum. I need help because it seems no one else in my class knows how to.

114. ## Science (Solar System)

How are the Oort Cloud and Kuiper Belt different from each other?

115. ## Math

The amount of background noise is important to television news reporters. One station developed the formula N = -r^2 + 12t + 54 showing the noise level in decibels (N) as it relates to the time after the speaker stops talking in seconds (t). How many

116. ## math

-1/7 divided by -4

117. ## ACCOUNTING- 2

HELP HERE IS WHOLE PROBLEM.IT NEEDS TO BE JOURNALIZED PROPERLY. mAY 15-fILED THE FEDERAL INCOME TAX RETURN FOR 2009. THE TOTAL TAX FOR THE YEAR WAS 124,000. DURING 2009, QUARTERLY DEPOSITS OF ESTIMATED TAX TOTALING 122,700 ;HAD BEN MADE. THE ADDITIONAL TAX

118. ## Chemistry

A 2.64 L container is filled with 169 g of argon. (a) If the pressure is 10.0 atm, what is the temperature? ____K (b) If the temperature is 225 K, what is the pressure? What Gas law formula would I use?

119. ## Community Health

Are the levels of prevention appliacble and practiced in your community?

121. ## math

what is five times ten

122. ## CHEMISTRY

What is the concentration in normality of NAOH (19.5CM3)

123. ## physics

what is the speed of a car in km/n if it travels 108 km. in 1 min.?

124. ## science- physcs

Two trains are passing against each other.? Two trains are passing against each other. train A is going north with velocity of 47 km/hour. train B is going south with velocity of 94 km/hour. a passenger in train A see the smoke that emitted from his train

125. ## trig

A 115 foot foot casts a 147 foot shadow, what is the degree of elevation to the sun

126. ## Calc I

I really need assistance!! I am to write an equation so that I can graph it. I do not understand how to graph OR write the equation for: x^2-y^2=16 for a tangent and normal line??? I keep coming up with the wrong answers...and the problem is I was not

127. ## CALCULUS

FIND EACH INDEFINITE INTERGRAL BY THE SUBSTITUTION METHOD X^3+X^2/3X^4+4X^3 DX

128. ## chemistry

You have an aspirin dissolving in water, with this elements ( arthritis strength BC, arthropan and Ascripitin A/D), how can you separate them to find the amout of each on in water?

129. ## Chemistry

A 2.64 L container is filled with 169 g of argon. (a) If the pressure is 10.0 atm, what is the temperature? ____K (b) If the temperature is 225 K, what is the pressure? What Gas law formula would I use?

130. ## physcis

use the principle of an incline plane and derive the coeffecient of stationary friction

131. ## Algebra 1

Give the value of a,b,c in equation 3x=5 - 0.5x^2

132. ## math

my daughter in Grade 2'her project is "MAKE A LADDER OF 8 STEPS WITH NUMBERS TO FIND ASUM TOTAL.I Can't undestood it.

133. ## physical science

There are two set pieces in a theater sitting on platforms with wheels. One is a tree with a mass of 50 kg. It is moving at 3 m/s. The other is a fence with a mass of 30 kg. If the two set pieces have equal momentum, how fast is the fence moving

134. ## Pre-Calculus

1. Find functions f and g so that f[g(x)]=H(x) where H(x)=(1+x^2)^3 2. For f(x)=4x+1 and g(x)=x^2-2x-4, find (g-f)(x) 3. Determine f(x)=x/x^2-4 4. Determine the domain of f in f(x)=10-sqrt3-x

135. ## dy/dx

Ln (2x^2-3x)^4 how to solve it. I did the steps but none of my answers are the choices

136. ## mathm

how do you find the absolute maximum of 2x^3+3x^2-12x-7 on interval (-3,0)

137. ## Algebra 1

The sum of the digit of a two digit number is 13. If the digits are reversed, Then the new number is 9 more then the original number. Find the original number.

138. ## Algebra 1

The sum of the two digit number is 7. The ten digit is one less than 3 times the one digit. Find the number.

139. ## algebra

(x+2)^2+(y-4)^2=9

140. ## Algebra 1

Solve. (3^2x)+5=(9^2x-5)

141. ## math

|x| - 5 __________ = 6 4 i need help

142. ## Physics Equation

What is the equation for total energy (TE)?

143. ## Math

Find the probability of the following if there are 30 students in the class who have been numbered and you use a calculator to generate random numbers between 1 and 30. A number less than 10.

3+5x+(-3)

145. ## calculus

find critical values for the function sqrt x^2+x-20

146. ## math

the proportion of the wind's energy that can be obtained from a windmill is given e(x)=4x^3-8x^2+4x where x is slowed find proportion x that max interval (0,1)

147. ## college algebra

graphing a hyperbola. -4x^2+9y^2+8x+72y-4=0 - just need help setting it up into an equation

5x4 3/4

149. ## algebra

2/3 _ x/5 < 4/15