# Questions Asked onNovember 30, 2012

1. ## Chemistry

When solutions of KCl and Pb(NO3)2 are mixed, a precipitate forms. Which of the following is the balanced equation for the double replacement reaction that occurs? a. KCl(aq) + Pb(NO3)2 (aq) ¨ KNO3 (aq) + PbCl2 (s) b. KNO3 (aq) + PbCl2 (s) ¨ KCl(aq)

2. ## MATH

An urn contains 8 pink and 7 red balls. 6 balls are randomly drawn from the urn in succession, with replacement. That is, after each draw, the selected ball is returned to the urn. What is the probability that all 6 balls drawn from the urn are pink? Round

3. ## science, chemistry

Separate this redox reaction into its component half-reactions. O2+2Cu---->2CuO thought it was: Oxidation 2e-+O2---->2O(-2) Reduction Cu---->Cu(2+)-2e- but this is wrong

4. ## PHYSICS

A man enters a tall tower, needing to know its height. He notes that a long pendulum extends from the ceiling almost to the floor and that its period is 11.5 s. (a) How tall is the tower? _________ m (b) If this pendulum is taken to the Moon, where the

5. ## PHYSICS

Light waves are electromagnetic waves that travel at 3.00 108 m/s. The eye is most sensitive to light having a wavelength of 5.50 10-7 m. (a) Find the frequency of this light wave. __________ Hz (b) Find its period. _______________ s

6. ## precalculus

Solve the given equation. (Enter your answers as a comma-separated list. Let k be any integer. tan θ = − sqrt 3/3

7. ## calculus

A conical water tank with vertex down has a radius of 12 feet at the top and is 23 feet high. If water flows into the tank at a rate of 20 {\rm ft}^3{\rm /min}, how fast is the depth of the water increasing when the water is 17 feet deep?

8. ## physics

As shown in the figure below, a 2.25-kg block is released from rest on a ramp of height h. When the block is released, it slides without friction to the bottom of the ramp, and then continues across a surface that is frictionless except for a rough patch

9. ## physics

In an electrically heated home, the temperature of the ground in contact with a concrete basement wall is 13.0 oC. The temperature at the inside surface of the wall is 21.1 oC. The wall is 0.19 m thick and has an area of 8.3 m2. Assume that one kilowatt

10. ## PHYSICS

A spring is hung from a ceiling, and an object attached to its lower end stretches the spring by a distance d = 7.70 cm from its unstretched position when the system is in equilibrium as in the figure below. If the spring constant is 48.0 N/m, determine

11. ## physics

A solid sphere is released from the top of a ramp that is at a height h1 = 1.95 m. It goes down the ramp, the bottom of which is at a height of h2 = 1.38 m above the floor. The edge of the ramp is a short horizontal section from which the ball leaves to

12. ## physics

A car moves a distance of 200 km. It covers the first half of the distance at speed 40 km/h and second half of the distance by speed v. The average speed is 48 km/h. Find the value of v

13. ## Physics

An organ pipe is open at both ends. It is producing sound at its third harmonic, the frequency of which is 406 Hz. The speed of sound is 343 m/s. What is the length of the pipe?

57. ## physics

A horizontal 790-N merry-go-round of radius 1.30 m is started from rest by a constant horizontal force of 50 N applied tangentially to the merry-go-round. Find the kinetic energy of the merry-go-round after 2.0 s. (Assume it is a solid cylinder.) J

58. ## physics

A car is designed to get its energy from a rotating flywheel (solid disk) with a radius of 1.00 m and a mass of 600 kg. Before a trip, the flywheel is attached to an electric motor, which brings the flywheel's rotational speed up to 4,000 rev/min. (a) Find

59. ## physics

A large grinding wheel in the shape of a solid cylinder of radius 0.330 m is free to rotate on a frictionless, vertical axle. A constant tangential force of 250 N applied to its edge causes the wheel to have an angular acceleration of 1.053 rad/s2. (a)

60. ## Math

A boat travels 1 km upstream and 1 km back. The time for the round trip is 4 hours. The speed of the stream is 5 km/hr. What is the speed of the boat in still water?

61. ## Chemistry

consider 1.0 L of a solution which is 0.55 M HF and 0.2 M NaF (Ka for HF = 7.2 x 10-4). Calculate the pH after 0.10 mol of HCl has been added to the original solution. Assume no volume change on addition of HCl. Goes along with the last one i posted, i

62. ## Physics !:(

A carbon dioxide laser is an infrared laser. A CO laser with a cavity length of 48.6cm oscillates in the m=100,000.0 mode. What is the wavelength of the laser beam? b). What is the frequency of the laser beam?

66. ## programming logic raptor

1. a.input names of students from the user, terminated by "zzz", 0,0,0, and create a data file grades with records of the following form: student (string), test1 (integer), test2(integer), test3 (integer) b. display the contents of the file grades created

67. ## chemistry

Reaction: CaCO3 + 2 HCl -> CaCl2 + CO2 + H2O Calculate the molarity of hydrochloric acid solution if an initial mass of 4.568g of CaCO3 was reacted with 25.0mL of the acid and 2.678g of CaCO3 remain after the reaction is complete.

68. ## physics

A 0.330-kg block of wood rests on a horizontal frictionless surface and is attached to a spring (also horizontal) with a 29.5-N/m force constant that is at its equilibrium length. A 0.0600-kg wad of Play-Doh is thrown horizontally at the block with a speed

69. ## English

1. He is a member of the swimming club 2. 2. He is a member of the Swimming Club 2. 3. He is a member of Swimming Club 2. 4. He is a member of a swimming club 2. (Which one is correct? There are two swimming clubs here. In this case which expression should

70. ## chem

Calculate the H+ ion concentration given the following pH readings: a) 2.00 b) 9.50 c) 10.40 d)-125(is this a reasonable question neee help

71. ## physics

A projectile is shot straight up from the earth's surface at a speed of 1.50×104 .

72. ## math

(x-3)/(6)-(7)/(15)≤(3x-1)/(10)

73. ## chem101

Processed cheese must be at a pH of 5.5 to 5.9 to prevent growth of unwanted microorganisms. If a sample comes back with [OH-]of 7.76e-9 as a control supervisor would you send the cheese back? Justify your answer. My asnswer is no but I don't know how to

74. ## physics

A 2.5m long pole is balanced vertically on it's tip. If it falls over with it's bottom never slipping. Find the speed of the top end of the pole just before it hits the ground.

75. ## Chemistry

If saturated solution of barium chloride at 30 degree Celsius contains 150g water how much additional barium chloride can be dissolved by heating it to 60 degree Celsius? 30 degrees Celsius = 38.2 60 degrees Celsius = 46.6

76. ## Math

A spherical balloon is inflated with helium at the rate of 100pi ft ^3/min. How fast is the ballon's radius increasing at the instant the radius is 5ft.?

77. ## math

1) Write a translation rule that maps point D(7, –3) onto point D'(2, 5). 2) Triangle ABC has coordinates A(1, 4); B(3, –2); and C(4, 2). Find the coordinates of the image A'B'C' after a reflection over the x-axis. Note: PLEASE ANSWER NICE AND NEAT AND

78. ## physics

A 25 g bullet is fired from a gun into a 1.35 kg block of wood initially at rest. (The bullet sticks in the wood). The wood is driven 9.5 m across a horizontal surface with coefficient of friciton 0.25. Find the speed of the bullet just before impact.

79. ## chem101

Processed cheese must be at a pH of 5.5 to 5.9 to prevent growth of unwanted microorganisms. If a sample comes back with [OH-]of 7.76e-9 as a control supervisor would you send the cheese back? Justify your answer. My asnswer is no but I don't know how to

80. ## English

What does the quote, ""The world is not interested in what we do for a living. What they are interested in is what we have to offer freely - hope, strength, love and the power to make a difference!" mean?

81. ## chem101

Calculate the H+ ion concentration given the following pH readings: a) 2.00 b) 9.50 c) 10.40 d)-125(is this a reasonable question neee help

82. ## chem

What is the difference between a weak acid and a dilute acid: a strong acid and a concentrated acid? Give an example of each

83. ## CHEMISTRY

Cant figure this out, I feel like the answer I keep getting is way too low. A voltaic cell is constructed that is based on the following reaction: Sn2+ (aq) +Pb(s) = Sn(s) + Pb2+ (a) If the concentration of Sn2+ in the cathode compartment is 1.00M and the

84. ## Algebra 2

Ryan moved into a new house with a 1750 gallon pool and needs to fill it. He can't figure out how to close his pool drain. It fills up in 1458 minutes,but it drains in 2187 1/2 minutes. When will it be full?

85. ## PUBLIC RELATION

Can someone tell me what is the differences between public relation and legal ethics? i know there is, lawyer practise in court of aw where there is fairness and equal representation while PR work in court of opinion. Lawyers advise clients on what they

86. ## physics

As shown in the figure below, a stick of length L = 0.330 m and mass m = 0.205 kg is in contact with a rough floor at one end and a frictionless bowling ball (diameter d = 21.50 cm) at some other point such that the angle between the stick and the floor is

87. ## chemistry

what is cryogenetics

88. ## Calculus [Finding volume of solid]

Find the volume of the solid obtained by rotating the region bounded by the given curves about the specified axis. y=x^2 y=0 x=3 about the y-axis

89. ## physics

a 150N boy rides a 60N bicycle a total of 200m. The frictional force against forward motion bicycle is 35N. How much work does boy do?

90. ## Physics-rain velocity to bike

Rain falls vertically downward with a velocity of 2.4m/s. A boy moves at a speed of of 6m/s east in a bicycle with an umbrella. What is the velocity of the rain with the respect to the boy. What angle from horizontal should he hold his umbrella?

91. ## Math [Consumer Surplus]

The demand function for a certain brand of blank digital camcorder tapes is given by p=−0.02x^2−0.1x+24 where p is the wholesale unit price in dollars and x is the quantity demanded each week, measured in units of a thousand. Determine the consumers'

92. ## Calculus

What do they mean about this question below::: Find the length of the portion of the parabola bounding R Would I have to use the arc length formula or some other formula in order to solve this problem

93. ## chemistry

I need the pre lab anwsers to 22, I have been studying for a test and have not finished them

Answer the following question in your discussion group: Sometimes people say “Give 110% of your effort.” Is it possible to give 110% of your effort? Is there ever a situation where you might have a percent over 100? If no, explain why. If yes, give a

95. ## chemistry

A student measures the conductivity of a KNO3 solution and determines it to be a strong electrolyte. the student incorrectly lists the species in solution as KNO3,K+, NO3. Give the correct list of species in solution? Please help I am lost

96. ## Adult Development and life Assesment

The training of animals (like teaching dogs to open doors for the disabled) uses principles of psychology. 1. cogntive 2. analytic 3. social 4. behavioral I think it's behavioral

97. ## MIS Nooona MBA

1- I need some ways the company use data on computers before discarding them ? 2- I want three programs that can destroy data on hard disk ? 3- Which method or program is the best for destroying data so that no body can recover it ?

98. ## Physics

My experiment setup was like this: i48.tinypic. com/14n31pl.jpg FYI, there is sandpaper between the ruler and the wall. I calculated the coefficient of friction to be 0.468. Is that correct? A second question asks that as the hanging weight is moved closer

99. ## AP Physics

A flagpole is to be installed on the front of an office building as shown below. The pole itself weighs 150 N and is 2 meters long. The support wire is attached at a 60º angle at a point 0.5 meters from the building. A. Find the value of the tension in

100. ## Math (Calculus)

Use implicit differentiation to find the slope of the tangent line to the curve y/(x–9y)=x^6–2 at the point (1,-1/-8). Can someone please help me? I don't understand

101. ## math

Find the vertices, foci, and eccentricity of the ellipse. Thank you. x^2/16 + y^2/25 = 1

102. ## math

Find the vertices, foci and eccentricity of the ellipse.Thank you 9x^2 + y^2 = 81

103. ## Math

A rectangle area spans . The length must be 20ft more than the width. What are the dimensions?

104. ## science

1.Leeuwenhoek’s invention of the _____ made the development of the cell theory possible. * telescope * microscope * cork * magnified glass 2. Chlorophyll can be found in organelles called______. * amino acids * chloroplasts * Golgi bodies * ribosomes

105. ## health

1. A sickness resulting from eating food that is not safe to eat empty-calorie foods nutrition foodborne illness nutrient density

106. ## Math

Patsy has cheerleading practice on every fourth school day. She wants to be in the school play, but they have practice on every sixth school day. If both started on September 5th, what would be the first date that she has to choose between cheerleading and

107. ## ALG2! WORD PROBLEM!very important!!

There are two adults and three children (under the age of 12). They qualify for a special family rate of $174.45. The clerk tells them that a child's ticket always costs$11 less than an adult's ticket. How much is each adult ticket and how much is each

108. ## physics

If a car takes a banked curve at less than the ideal speed, friction is needed to keep it from sliding toward the inside of the curve (a real problem on icy mountain roads). (a) Calculate the ideal speed to take a 105-m radius curve banked at 13.0°. km/h

109. ## health

2. A nutrient that helps control the amount of fluid in your body sodium calorie protein nutrition I thinks its A

110. ## college algebra

write the expression as a single logarithm 1. In(x/x*2)+In(x+2/x)-In(x^2-4) solve the following logarithmic equation. 2. log_9(x-2)+log_9(x+1)=2 what is the exact solution? What is the decimal approximation for the solution when rounded three decimal

111. ## math

A rectangle has an area about 225m^2. the width is about 40m less than the length. Find the approximate dimensions of the playing surface. use factoring.

112. ## sat essay

Assignment: Should heroes be defined as people who say what they think when we ourselves lack the courage to say it? Plan and write an essay in which you develop your point of view on this issue. Support your position with reasoning and examples taken from

Questions 1­–2 are based on "Loser." Questions 3–5 correspond to "Friends Forever." 1. What event caused the main character to change? (1 point) his date with Jenny his parents' deaths his strange talent finding the lost boy 2. How did Jenny react

114. ## social studies

Dr. Skinner is a behaviorist. Your co-worker, Terry, asks the good doctor why Baby Herbie gives a happy yell, smacks his lips, and grins every time Terry opens the cookie jar. Dr. Skinner is most likely to answer that Herbie: A is in the oral stage and is

115. ## college algebra

find functions f anf g so that fog equals H H(x)=ãx^2+17 please show work

116. ## Math

If A represents the number of apples purchased at 15 cents each, and B represents the number of bananas purchased at 10 cents each, which of the following represents the total value of the purchases in cents? a) A+B b) 25(A+B) c)10A+15B d) 15A+10B

117. ## math

Toby is making a scale model of the battlefield at Fredericksburg. The area he wants to model measures about 11 mi by 7.5mi. He plans to put the model on a 3.25 ft by 3.25ft square table. On each side of the model he wants to leave at least 3 inches

118. ## math

Toby is making a scale model of the battlefield at Fredericksburg. The area he wants to model measures about 11 mi by 7.5mi. He plans to put the model on a 3.25 ft by 3.25ft square table. On each side of the model he wants to leave at least 3 inches

119. ## Adult Development and life Assesment

After seeing how she interacts with the little Maltese dog next door, Ellie's parents decide to get her a dog too. Ellie'snew Golden Retriever is much bigger and looks different, but because it is new but very similar, she understand ghow to interact wiyh

120. ## Math-II ( Joint and Combined Variation)

1. R varies jointly as S and t. If R=1/6,S=1/8 and T=3, find R when S=2 and T=11. formula: R=KST 2. U varies jointly as L and H and inversely a S. If U=1.8, L=6.4, H=1.5 and S=-7.2, find U when L=4.3, H=5.1 and S=-2.2. formula: U=KLH/S Please Help!!

121. ## Calc 1

integrate from 0 to pi/4 (sec^2x)/((1+7tanx)^2)^1/3 integrate form pi^2/36 to pi^2/4 (cos(x^1/2))/(xsin(x^1/2))^1/2 integrate from 0 to pi/3 (tanx)/(2secx)^1/2

122. ## maths

The difference of compound interest and simple interest on an amount at the rate of 12% per annum for 2 years is Rs. 90/- then the amount will be -

123. ## maths

The perimeter of the base of a cylinder is as same as the perimeter of a square whose one side is 11 cm. If the volume is 98π cm3, the height of the cylinder will be :

124. ## Chemistry

Is lead non-polar covalent, polar covalent, ionic, network, or metallic and why?

125. ## Analytical Chemistry

How many mg of X is contained in 25 ml of a solution giving an absorbance of 0.250 at 400 nm when measured with a 1 cm cell ?

126. ## PHYSICS

A bat can detect small objects, such as an insect, whose size is approximately equal to one wavelength of the sound the bat makes. If bats emit a chirp at a frequency of 8.31 104 Hz, and if the speed of sound in air is 343 m/s, what is the smallest insect

127. ## General Chemistry

Titration between iodine and thiosulphate. Why starch solution has to be added when the solution just turned pale yellow, but not at the beginning of reaction?

128. ## Analytical Chemistry

How many mg of X is contained in 25 ml of a solution giving an absorbance of 0.250 at 400 nm when measured with a 1 cm cell ?

129. ## Use of english

List fifteen differences between common noun and proper noun

130. ## hvac school

What temp would a fixed volume of gas need to be heated in order to double its pressure if it starts out at 25?

4. Which of the following is a prepositional phrase? (1 point) he didn't feel safe leaving us behind without supervision 6. Which of the following is not an interjection? (1 point) oops awesome maybe My answers: 4. without supervision 6. maybe

132. ## math

im trying to complete this input output table input 0 output blank input 3/2 output 17/6 input 11/4 output blank input 3 output 13/3 input blank output 13/2

133. ## math

factor 9-900f^2

134. ## math

factor 9-900f^2

135. ## Physics

A loudspeaker diaphragm is producing a sound for 2.0 s by moving back and forth in a simple harmonic motion. The angular frequency of the motion is 8.55 104 rad/s. How many times does the diaphragm move back and forth?

136. ## Physics

A bungee jumper, whose mass is 81 kg, jumps from a tall platform. After reaching his lowest point, he continues to oscillate up and down, reaching the low point two more times in 8.9 s. Ignoring air resistance and assuming that the bungee cord is an ideal

137. ## Math

how do i figure out this equation? Joy knits a square blanket that has an area of 1,500 square inches. What is the approximate length of each side of the blanket? HELP !! Ms Sue! a 16 in b 27in 39 in 42 in i don't understand how to solve this!

138. ## Physics

A copper rod (length = 1.3 m, radius = 3.70 10-3 m) hangs down from the ceiling. A 8.3-kg object is attached to the lower end of the rod. The rod acts as a "spring", and the object oscillates vertically with a small amplitude. Ignoring the rod's mass, find

139. ## math

A drawer contains exactly 5 red socks, 8 blue socks, 10 while socks, 12 green socks , and 7 yellow socks. Find the least number of socks to be chosen which will guarantee that there will be at least seven socks of the same color.

140. ## Algebra 2..

Simplify. 4i (imaginary number)

141. ## physics

Block a is moving with a certain acceleration along a frictionless horizontal surface. When a second block B is placed on top of block A, the acceleration of the combined block drops to 1/5 the original value. What is the ratio of the mass of A to the mass

142. ## Algebra

Tanya is 1 year less than three times the age of her sister Jessica. Jessica is five years old. How old is Tanya? Need an equation

143. ## maths

When two cube of side 12 cm are joined end to end to form a cuboid then the total surface area of cuboid is

144. ## Physics

A small ball is attached to one end of a spring that has an unstrained length of 0.202 m. The spring is held by the other end, and the ball is whirled around in a horizontal circle at a speed of 3.18 m/s. The spring remains nearly parallel to the ground

145. ## english

innnniytevebcaaasdd phrase, 3 words first 8 letters second two letters third, 9 letter question: what does basketball and hockey have in common? -------- -- --------- please answer i need it tomorrow!

146. ## 7th grade language arts Ms. Sue

1. If the following sentence was rewritten to be more specific, which would be the best revision? "It was a privilege and not a right, and you messed it up." (1 point) "It was a privilege and not a right, and you don't have it now." "It was a privilege and

147. ## math

Triangle ABC has coordinates A(1, 4); B(3, –2); and C(4, 2). Find the coordinates of the image A'B'C' after a reflection over the x-axis

148. ## Darin

a teacher knows that 80 percent will score no more than 5 points above or below the class average 85 percent on the test which inequality represents the test score of 80 percent of her student.

149. ## Math

A jar of marbles is half red, one third green and the rest blue. If eight marbles are green how many are blue?

150. ## psychology

Myelination of your brain began before you were born and will continue in a part of your brain until you are at least 70 years old. Because of this process: A your brain cells will not be pruned back and die, so you will learn more. B you will retain the

151. ## psychology

Dr. Skinner is a behaviorist. Your co-worker, Terry, asks the good doctor why Baby Herbie gives a happy yell, smacks his lips, and grins every time Terry opens the cookie jar. Dr. Skinner is most likely to answer that Herbie: A is in the oral stage and is

152. ## Calculus

integral[13,4]sin^2(8x)cos^2(8x)dx

153. ## Math

Water is flowing at the rate of 50m^3/min from a concrete conical reservoir of base radius 45m and height 6m. How fast is is the water level falling when the water is 5m deep?

154. ## Economics

Can there be inflation with without an increase in the money supply? How?

155. ## math

Solve the proportion using cross products. 20 Miles 15 Miles ________ = __________ 50 Miles h Hours Please Answer!!!!

156. ## CHEMISTRY

2.05 Grams of a liquid vaporized at 80 c in a 1 liter flask and a pressure of 1 atm. what is the molar mass of the gas?

Post a 150-200 word response to the following question: Internet search engines, such as Google and Bing, have a great deal of influence and control over how we access information online. A new term, search neutrality, proposes that search engines should

158. ## Physics

An object is placed 11 cm in front of a convex mirror of focal length 4 cm. Using the lens equation, find where the image will form and state whether it is a real or virtual image.

159. ## Physics

An object is placed 4 cm in front of a concave lens of focal length 3 cm. Using the lens equation, find where the image will form and state whether it is a real or virtual image.

160. ## statistics

Working on "Inferences from Dependent Samples" trying to find the standard deviation of the difference data. Differences: 24, 53, 100, 40, -10,71,77,70, 39, 50 n=10 d=51.4 sd=??? (Answer suppose to be 30.8336 but not coming close to this number at all)

161. ## maths

A girl buys 9 apples for Rs.9.60 and sells that at 11 for Rs. 12. What does she gain or loss.

162. ## Calculus

Use the substitution x=3tan() to evaluate the indefinite integral 93dx/(x^2sprt(x^2+9))

163. ## Math

A kite is being flown at a height of 300 ft, and the wind carries the kite horizontally away at a rate of 25ft/sec. How fast must the string be let out when the kite is 500ft away?

164. ## Algebra2

Is this right?? 1. f(x)= |x-5| if x≤1 ; (1)/(x+1) if x>1 f(-5) = |-5-5| = 10 f(1) = |1-5| = 4 f(3) = 1/4

165. ## math

Find the unit rate. Round to the nearest tenth. 344 miles in 11 hours i try and try i still don't get it please anybody could help me please =(

166. ## college algebra

solve the following logarithmic equation. 1. 2log(lower2) (x-2) + log(lower2)^2=3 I do not know how to make the 2 by the g on my computer. 2. log(lower729^x) + log(lower27^x) + log(lower3^x) =9 again I do not know how to make the numbers lower case please

167. ## Physical Chemistry

Calculate DS if the temperature of 3 moles of an ideal gas with Cv,m = 1.5R is increased from 200 K to 500 K under conditions of (a) constant pressure and (b) constant volume.

168. ## physics

how much would a stationary vehicle have to accelerate in order for it to catch up to another vehicle traveling 74 miles per hour in a distance of .5 miles? what would its final speed be?

169. ## Calculus

integral[7 sqrt 2/2,0]sqrt(49+x^2) dx

170. ## Calculus

integral (sqrt(100x^2-324)/x)dx

171. ## Adult Development and life Assesment

Your instructor asks you to compare positive and negative reinforcement and explain your conslusions in class. what will you report . Positive reinforcement increases the frequency of responses and negative reinforcement decreases the frequency of

172. ## physics

A submarine is patrolling the ocean. Each hour, it descends 25 feet and then ascends 10 feet. At 7:00 AM, it is at a depth of –100 feet. What will its depth be at 11:00 AM?

173. ## healthcare commumication

What are the advantages and disadvantages of using traditional, electronic, and social media for health care communication What are the effects of HIPAA and other regulations on the use of these media for health care communication

174. ## Math

What is the best estimate of the measure of: Right triangle, A,B,C, if there are no degrees. Ans. 15 degrees. How do you get this if there are no degrees on the triangle??

175. ## sslope interception form

write slope interception form the equation of the line thay passes through (0,-2) and is perpendicular to the line 3y-2x=5

176. ## math

The Football field needs to be cut for the bog game on saturday. If the lawn service cuts 1/3 of the field on tuesday, and 1/8 of the field on thursday, what portion of the field remains to be cut on friday?

177. ## Chemistry

Your x-ray lab has a monochromator consisting of a single crystal of nickel cut so that the (001) plane lies in the cube face. At what angle (in degrees) should the cube face be tilted with respect to the incident beam in order to select radiation with a

178. ## CHEMISTRY

What is oxygen extensive properties?

179. ## algerbra

the perimeter rectangular pool is 160 meterss . The length of the pool is 20 meters . what is the length ?

180. ## math

factor, 4x^2-8xy-5y^2

203. ## math

6) 15 is 60% of what number?

204. ## chemistry

Reaction: Na2CO3 + 2 HCl -> 2 NaCl + CO2 + H2o How many grams of NaCl can be produced from the reaction of 1.35g of Na2CO3 with 125mL of 0.265 M HCl?

205. ## Math

Mechanics are reboring a 6in deep cylinder to fit a new piston. The machine they are using increases the cylinders radius one-thousandths of an inch every 3 min. How rapidly is the cylinder volume increasing when the bore is 3.800 in.?

206. ## college algebra

I am having to explain how to find the domain and range of a rational function from its graph. Can someone help me to try and put this into simple terms.

207. ## Physics

An object is placed 11 cm in front of a convex mirror of focal length 4 cm. Using the lens equation, find where the image will form and state whether it is a real or virtual image.

208. ## Statistics

What is the appropriate sample size for a confidence interval around the sample mean if you want a margin of error of 0.8 with 95% confidence and a population standard deviation of 12.

209. ## Physics

An object is placed 4 cm in front of a concave lens of focal length 3 cm. Using the lens equation, find where the image will form and state whether it is a real or virtual image.

210. ## physics HELP!

The observed wave speed is 20.3 m/s when the suspended mass is m = 3.07 kg. What is the mass per unit length of the string? I keep calculating this out to be .5199 kg/m which i know is wrong! HELP!

211. ## statistics

How to convert VB2008 project in Windows Application (*.exe file)?

212. ## Math

If a 32 ft rope is cut into two sections with one section 7 times as long as the other section, how long is the shorter piece?

213. ## Economics

Your pay stub deducts money for FICA. What does this mean? A. Money is being withheld for personal exemptions and deductions. B. Money is being withheld for excise and estate taxes. C. Money is being withheld to fund Social Security and Medicare. D. Money

214. ## physics

Heat Q flows spontaneously from a reservoir at 481 K into a reservoir at 298 K. Because of the spontaneous flow, 2760 J of energy is rendered unavailable for work when a Carnot engine operates between the reservoir at 298 K and a reservoir at 249 K. Find

215. ## Physics HELP!!

1. What is the longest wavelength for standing sound waves in a 133.9cm long tube that is open at both ends? b).What is the second longest wavelength? c).What is the third longest wavelength? d).What is the longest wavelength for a standing wave, in the

216. ## Pre Calculus

For a given right triangle, side a = 76.4 feet and side b = 39.3 feet. What is the measure of angle A to the nearest degree?

217. ## Physics

A 71.4cm long tube has a 71.4cm long insert that can be pulled in and out. A vibrating tuning fork is held next to the tube. As the insert is slowly pulled out, the sound from the tuning fork creates standing waves in the tube when the total length L is

218. ## Physics HELP!!

A loudspeaker is placed between two observers who are 113m apart, along the line connecting them. If one observer records a sound level of 51.8dB and the other records a sound level of 75.8dB, how far is the speaker from each observer? Enter the longest

219. ## Physics

A source of sound (1140Hz) emits uniformly in all directions. An observer 3.09m from the source measures a sound level of 38.2dB. Calculate the average power output of the source.

220. ## pre calculus

For a given right triangle, side a = 400 feet and side b = 900 feet.What is the measure of angle A to the nearest degree?

221. ## Physics

When a metal pipe is cut into two pieces, the lowest resonance frequency in one piece is 244Hz and that for the other is 454Hz. What resonant frequency would have been produced by the original length of pipe? (Assume the speed of sound in air is 345 m/s)

222. ## pre calculus

For a given right triangle, angle A = 61± and side b = 39 feet. What is the length of side c to the nearest foot?

223. ## Physics

A standard man shouting loudly produces a 87.4dB sound at a distance of 7.05m. At what rate does he emit sound energy? Express the result in J/s.

224. ## physics

in ydse, two parallel slits are made 1mm apart and a screen is placed 1m away. what is the fringe seperation when blue green light of wavelength 500 nm is used?

225. ## pre calculus

For a given right triangle, side a = 400 feet and side b = 900 feet. What is the measure of angle B to the nearest degree?

226. ## Physics

An underwater micriphone is used to record sounds emitted by porpoises. The minimum intensity level the instrument can record is 23.6dB. Assuming a porpoise emits sound at a rate of 0.0359J/s, what is the maximum distance at which the animal will still be

227. ## pre calculus

For a given right triangle, side a = 490 feet and side b = 960 feet. What is the measure of angle B to the nearest degree?

228. ## Physics

An underwater micriphone is used to record sounds emitted by porpoises. The minimum intensity level the instrument can record is 23.6dB. Assuming a porpoise emits sound at a rate of 0.0359J/s, what is the maximum distance at which the animal will still be

229. ## pre calculus

For a given right triangle, angle B = 46 degrees and side c = 30 feet.What is the measure of angle A to the nearest degree?

230. ## Physics HELP!!

Sound enters the ear travels through the auditory canal and reaches the ear drum, The auditory canal is approximately a tube open at only one end. The other end is closed by the eardrum. A typical length for the auditory canal in an adult is about 2.775

231. ## physics

1. During storm roof of house is blown off 2.It is dangerous to stand near the railway track when a train is moving with high speed

232. ## Physics

A 0.56-kg metal sphere oscillates at the end of a vertical spring. As the spring stretches from 0.13 to 0.26 m (relative to its unstrained length), the speed of the sphere decreases from 5.45 to 4.90 m/s. What is the spring constant of the spring? (The

233. ## math

The management of Ditton Industries has determined that the daily marginal revenue function associated with selling x units of their deluxe toaster ovens is given by the following, where R '(x) is measured in dollars/unit. (a) Find the daily total revenue

234. ## pre calculus

For a given right triangle, side a = 76.4 feet and side b = 39.3 feet. What is the length of side c to the nearest tenth of a foot?

235. ## Chemistry

An experiment that led to the formation of the new field of organic chemistry involved the synthesis of urea, CN2H4O, by the controlled reaction of ammonia and carbon dioxide. 2 NH3(g) + CO2(g)= CN2H4O(s) + H2O(l) What is the theoretical yield of urea when

236. ## pre calculus

For a given right triangle, side a = 76.4 feet and side b = 39.3 feet. What is the length of side c to the nearest tenth of a foot?

237. ## statistics

Find the z-score for the standard normal distribution where: P(z< -a) = 0.2451

238. ## pre calculus

For a given right triangle, angle A = 61± and side b = 39 feet. What is the length of side a to the nearest foot?

240. ## pre calculus

For a given right triangle, angle A = 61± and side b = 39 feet. What is the length of side a to the nearest foot?

241. ## English

What do you have to do before you go to bed? 1. I have to vacuum the floor of my bedroom 2. I have to make the bed. 3. I have to take out blankets and a pillow from the wardrobe. 4. I have to wash my face and brush teeth. 5. I have to close all the windows

242. ## math

The demand function for a certain brand of CD is given by the following equation where p is the wholesale unit price in dollars and x is the quantity demanded each week, measured in units of a thousand. p=-0.01x^2-0.1x+6 Determine the consumers' surplus if

243. ## pre cal

For a given right triangle, angle B = 46± and side c = 30 feet. What is the length of side a to the nearest foot?

244. ## math

Find the area of the region under the graph of the function f on the interval [4, 10]. f(x)=10x-5 ? square units

245. ## Physics

A car is traveling at 10 m/s. By what factor does the car's kinetic energy increase if its speed is doubled to 20 m/s?

246. ## yield

what is the theoretical yiled for 0.0300 moles of nitrobenzene if 3 ml was used.

247. ## Chemistry

Lead(II) oxide from an ore can be reduced to elemental lead by heating in a furnace with carbon. PbO(s) + C(s)= Pb(l) + CO(g) Calculate the expected yield of lead if 90.0 kg of lead oxide is heated with 90.0 kg of carbon.

248. ## Physics

A 17kg child slides down a 2.7m -high playground slide. She starts from rest, and her speed at the bottom is 1.8 m/s. What is the change in the thermal energy of the slide and the seat of her pants?

249. ## AP CALCULUS

Using the mean value theorem; F'(x) = f(b)-f(a) / b-a f(x)=x^2-8x+3; interval [-1,6]

250. ## English

1. He wants to be a famous cartoonist because he likes drawing cartoons. 2. He wants to be a famous professor because he likes teaching others and he likes learning from books. 3. He wants to be an architect because he likes drawing buildings. 4. He wants

251. ## Into. Chemistry

I'm trying to do this precipitation reaction problem, but I don't understand part of it. The question is: Does a precipitate form when aq. soultions of potassium nitrate (KNO3) and sodium iodide (NaI) are mixed? Then it lists the solutions for the two:

252. ## programming

There are several types of room in a hotel. The HotelRoom Class of Previous Programming Problem was not specific regarding the type of room. Assume that a hotel has guest rooms and meeting rooms. Modify the HotelRoom class as follows: remove the capacity

255. ## Statistics

Explain how the error term in a repeated measures ANOVA is actually an interaction

260. ## Statistics

Explain how the error term in a repeated measures ANOVA is actually an interaction

261. ## Precalculus

invests 7000 for 1 year part at 5% part at 11% and the remainder at 13% total amount of income from these investments was $774. The amount of money invested at 13% was$1200 more than the amounts invested at 5% and 11% combined find the amount invested at

270. ## Math

There are both white and brown eggs in the refrigerator. The ratio of the number of white eggs to the number of brown eggs is 3/4. Which of the following could be the number of eggs in the refrigerator?

271. ## programming

How to convert VB2008 project in Windows Application (*.exe file)?

272. ## math

Write the percent 82.33% as a decimal.

273. ## CHEMISTRY

cell diagram:H2(g,1atm) Pt Enter part(a), (c) with 2 siginificant digits and part(b) with 3 siginificant digits. Enter scientific notation as 1.23E4. (a) What is Ecell if the unknown solution in the half-cell on the left has pH = 4.94? ____________ (b)

274. ## CHEMISTRY

Use the Nernst equation and data from Appendix D to calculate Ecell for each of the following cells. Enter your answer with 3 significant digits. Enter scientific notation as 1.23E4. (a) Mn(s) | Mn2+(0.11) M || Cr3+(0.24 M), Cr2+(0.11 M) | Pt(s)

275. ## math

46 is what percent of 280

276. ## CHEMISTRY

Enter part(a), (c) with 2 siginificant digits and part(b) with 3 siginificant digits. Enter scientific notation as 1.23E4. (a) What is Ecell if the unknown solution in the half-cell on the left has pH = 4.94? ____________ (b) What is Ecell if the unknown

asked by sabrina:yes i couldn't post the cell diagram H+
277. ## math

If f(a) = (6-4a2)/a for all nonzero a, then f(2) = a

278. ## math

While walking outside on a hike 66% or 20, of the students in the class wore jackets. Find the number of students in the entire class.

279. ## CHEMISTRY

Use the Nernst equation to calculate Ecell for each of the following cells. Enter your answer with 3 significant digits. Enter scientific notation as 1.23E4. (a) Mn(s) | Mn2+(0.11) M || Cr3+(0.24 M), Cr2+(0.11 M) | Pt(s) ____________ (b) Mg(s) |

280. ## Physics Help

A 3.50-inch floppy disk in a computer rotates with a period of 2.02E-1 s. What is the angular speed of the disk?

281. ## Chemistry

not much of a question but more of an appreciation, thanks for helping i was really confused before today

282. ## Chemistry

Consider the following: CH4, SiH3Cl, Ar, and CH2F2. (a) Which one will diffuse the fastest? (b) What is the rms speed (m/s) of the slowest-moving atom or molecule at 25°C?

283. ## Statistics

The time per week a student uses a lab computer is normally distributed, with a mean of 6.2 hours and a standard deviation of 0.9 hour. A student is randomly selected. a. Find the probability that a student uses a lab computer less than 4 hours per week.

284. ## History

How did the compromises made when writing and ratifying the Constitution encourage the development of political factions? Compare and Contrast the effectiveness of Washington’s and Adams’ presidencies in obeying and promoting the Constitution during

285. ## physics

A thin uniform stick having a mass of 0.680 kg and a length of 1.50 m is at rest, hanging vertically from a strong, fixed hinge at the uppermost end of the stick. The stick is free to swing back and forth in an Up-Down-East-West plane. Suddenly, the

286. ## Algebra 2 ..

Solve (-16)^1/4

287. ## public speaking

For communication to take place, there has to be: A. transmission of the message. B. medium. C. sharing of meaning. D. absence of noise

288. ## math

for the line segment DE one edpoint is D(3,1) and the midpoint is M (0,-4). find the coordinates of endpoint E.

289. ## physics

A star the size of the sun has a mass 8 times as great. It rotates on its axis once every 12 days. It then collapses into a neutron star of radius 10km, losing three quarters of its mass in the process. How long does it take to rotate once after collapse?

290. ## math urgent urgent urgent

perpendicular to line -2x+y=7 contains the point (-4,-2) the equation of line is

291. ## psychology -statistics

why can we use the same multiple comparison procedures for between subjects, repeated measures, and mixed designs without changing the formulas

292. ## Fraction to decimal question

Is there any way to convert to a decimal if you can't find a denominator that works your way? like 21/34 ? can you explain???

293. ## physics

An object is projected upward from the surface of the earth with an initial speed of 2 km/s. The acceleration of gravity is 9.81 m/s^2. Find the maximum height it reaches. Answer in units of km.

294. ## Finance

risk free rate 5.5% market premium 6% beta 0.8 expected dividend $1.00 common stock$25.00 growth 6% bond yeild 6.5% capital struture 25% debt 15% preferred stock 60% common equity tax rate 40% preferred stock price $95 preferred dividend$11. what firm

295. ## math

what is the dross product of c/28=49/16

296. ## physics

a playground slide is a place inclined at 48 to the horizontal. a child of mass 25 kg slides down the slide for 4m. calculate the potential energy lost by the child

297. ## JHU

When excess solid Mg(OH)2 is shaken with 1.00 L of 1.2 M NH4Cl solution, the resulting saturated solution has pH = 9.30. Calculate the Ksp of Mg(OH)2

298. ## Pre Algebra

If you have 256 ft of fence for your yard. The lenth is 12 feet longer than twice the width. What are the dimensions?

299. ## Math

Determine the slope and y-intercept of the following linear equations.

300. ## Math

Determine the slope and the y-intercept of the following linear equations. 1. y = (3/2)x - 4 2. 2x + y - 3 = 0

301. ## Calculus: Help !

The demand function for a certain brand of blank digital camcorder tapes is given by p=−0.02x^2−0.1x+24 where p is the wholesale unit price in dollars and x is the quantity demanded each week, measured in units of a thousand. Determine the consumers'

302. ## Math

Could someone explain how to graph the following problem? I don't quite understand what "Graph H for 0 ≤ t ≤ 3 and 300 ≤ H ≤ 340" is asking me to do... The National Oceanic and Atmospheric Administration (NOAA) has been measuring atmospheric carbon

304. ## Calculus [rotation of region bounded by curves]

Find the volume of the solid obtained by rotating the region bounded by the given curves about the specified axis. y=3x^2, x=1, y=0 about the x-axis

305. ## Calculus [Finding volume of solid]

Find the volume of the solid formed by rotating the region enclosed by x=0 x=1 y=0 y=4+x^5

306. ## English

Which of the sentences below uses italics and quotation marks correctly? “You see,” he said, “there are two versions of the novel Zombie Prom at the bookstore.” “You see” he said, “there are two versions of the novel Zombie Prom at the

307. ## math

Thinking about the different types of numbers you learned in this unit, how would you help someone remember the differences between rational and irrational numbers? PLEASE ANSWER NICE AND NEAT AND CORRECT PLEASE AND THANK YOU!! =)

308. ## English

Which of the items below uses apostrophes correctly? Is this jacket Kevin’s? Wait, I think it’s actually your’s. Is this jacket Kevin’s? Wait, I think it’s actually yours. Is this jacket Kevin’s? Wait, I think its actually yours. I think it is

309. ## English

Which of the items below uses apostrophes correctly? Before she could address the invitations, Jessie needed everyone’s addresses. Before she could address the invitations, Jessie needed everyones’ addresses. Before she could address the invitations,

310. ## chemistry

The number of moles in 15.39g of C2H6O?

311. ## CHEMISTRY

Co(s) will oxidize Fe(s) while leaving Cu(s) unreacted, please write a balanced equation for the reagent involved?

312. ## English

Which of the following sentences is punctuated correctly? Mom thinks we need to arrive by seven o’clock; but I don’t think that’s necessary. We will end up waiting around for the others; that will be boring. I think we should get there at eight

313. ## English

Which of the following sentences is punctuated correctly? David wants to go skiing; however he can’t go with you this weekend. David wants to go skiing, however, he can’t go with you this weekend. David wants to go skiing; however, he can’t go with

314. ## Math :/

Point E is located at (–2, 2) and point F is located at (4, –6). What is the distance between points E and F? Please help, I have no idea!

315. ## maths

two adjacent sides of a parallelogram measure 15 cm and 20 cm while the diagonal opposite their common vertex measure 25 cm.find the area of he parallelogram.

316. ## Math

(x)/(3)+(5)/(6)

317. ## chemistry

The fictitious compound, arrhenium fluoride (AhF), reacts with itself to form a dimer with the formula Ah2F2. The reaction is second order in AhF. The value of the rate constant is 5.591×10−3 M−1s−1. What is the initial rate of reaction in a reactor

318. ## elementary

i need help making a story with these play,fry,stays,fried,spies,spy,stay,cry spelling words

319. ## Physics

A boy throws a stone with an initial velocity of 14.6 m/s and it returns to his hand in 3 seconds. What maximum height does the stone reach?

320. ## MATH

Harriet needs to ship a small vase. The box she will use has a volume of 216 cubic inches. If the side lengths are all the same, what is the length of each side of the box? Hint: V = S^3 PLEASE ANSWER NICE AND NEAT AND CORRECT PLEASE AND THANK YOU!! =) :-)

321. ## chem

a.)How many moles of NaOH are required to prepare 2.00L od 0.380M solution? answer is 0.760 mole of NaOH (mole/l * 2.00L) b.)What will be the molarity of a solution if 3.50 g of KOH are dissolved in water to make 150.0 mL of solution? answer is 0.52 M KOH

322. ## Algebra2

is this right? 27. h(x)= |x-3| ; x=0,1,2,3,4,5,6 h(x); |0-3| =3 h(x); |1-3|=2 h(x); |2-3|=1 h(x); |4-3|=1 h(x); |5-3|=2 h(x); |6-3|=3

323. ## chem

What is the difference between a weak acid and a dilute acid: a strong acid and a concentrated acid? Give an example of each