# Questions Asked onMarch 29, 2011

1. ## physics

A gymnast with mass m1 = 47 kg is on a balance beam that sits on (but is not attached to) two supports. The beam has a mass m2 = 118 kg and length L = 5 m. Each support is 1/3 of the way from each end. Initially the gymnast stands at the left end of the

2. ## physics

A gymnast with mass m1 = 47 kg is on a balance beam that sits on (but is not attached to) two supports. The beam has a mass m2 = 118 kg and length L = 5 m. Each support is 1/3 of the way from each end. Initially the gymnast stands at the left end of the

3. ## physics

A volume Vi = 23.1 L of air at temperature T = 21 ¢XC is compressed at constant temperature to a volume Vf = 7.7 L. The relative humidity of the air before compression is R = 56.4 %. Saturated water vapour in air at this temperature has a vapour pressure

4. ## Calculus

Function f(x)= e^-x^2 a) Inflection Values b) Intervals on which f(x) is concave downward c) Intervals on which f(x) is concave upward.

5. ## Chemistry

To culinary experts and to the average person the term “Extra Virgin” has a ring of exclusiveness and quality to it. When it comes to olive oil, exactly what does this term signify? I am supposed to explain the chemistry behind Extra Virgin Olive oils,

6. ## Primary Auditory Cortex (Psych)

In lecture the prof says A1 and primary visual cortex interchangeably. Are they the two just different ways of referring to the same thing or is A1 a specific regions in the primary auditory cortex?

7. ## Environmental Science

Debate the claim that famines are caused more by human actions (or inactions) than by environmental forces. What scientific evidence would you need to have to settle this question? What hypotheses could you test to help resolve the debate?

8. ## English

A teacher has so many things that they are responsible for and for that reason; it is beneficial for everyone to have as much help as possible. Is this sentence correct or should it be a comma after reason?

9. ## algebra 2

Darla is building a new desk. To make sure she had made a square corner, she measures 10ft from the corner along one edge and 7ft from the corner along the other edge. How long should the diagonal be betwee those two points if the corner is a right angle?

53. ## Physics

Specifically, which of the following best expresses your view: i. Many physics concepts make a lot of sense and connect to everyday experience; but formulas are more of a problem-solving tool than a sense-making tool. ii. It really depends on the formula.

54. ## Maths

Find the general solution to the system dx/dt=Ax where A[0,1;1,0]

94. ## Health

Smoking marijuana over a long period of time can cause a. chronic bronchitis and damaged lung tissue. b. Alzheimer's Disease. c. tongue cancer. d. all of the above. D?

95. ## Calculus

Find the absolute maximum value and the absolute minimum value, if any, of the function. g(x) = -x(^2) + 2 x + 9

96. ## Physics 203

A puck of mass 0.60 kg approaches a second, identical puck that is stationary on frictionless ice. The initial speed of the moving puck is 5.0 m/s. After the collision, one puck leaves with a speed v1 at 30° to the original line of motion. The second puck

97. ## Spanish

I have to find the verbs in the preterite and the imperfect but I'm getting them marked wrong. 1. Mi amiga Anita siempre tenía dolor de cabeza cuando estudiaba. my answer: tenía; estudiaba 2. El diente me dolió todo el fin de semana pero el lunes el

98. ## Physics

Can an electron at rest in a magnetic field be set into motion by the magnetic field? What if it were at rest in an electric field?

99. ## math

Given triangle RST, find cos T.

100. ## cross creek

In "A Pair of Silk Stockings," the silk stockings are a symbol of

101. ## government

Provide a current event example that you think illustrates the power of one branch of government to check another.

102. ## math

is each sum greater than or less than 4? 1.7 +0.6 +2.0 = 1.3 +0.86+1.6=

103. ## math

write an equation for 16 groups of 18.

104. ## Chemistry

The following reaction can be used to determine the amount of calcium ion present in milk. Before the reaction below is carried out ca2+ is precipitated out of a sample of milk as CaC2O4(s). The CaC2O4(s) is then titrated with MnO4-. 2MnO4-(aq) +

105. ## Math

The following data show the number of Chinese citizens who immigrated to the U.S. Use the data to predict how many Chinese immigrated to the U.S. during the 1990s. Decade No. of Chinese Immigrants 1950s 10,000 1960s 35,000 1970s 124,000 1980s 389,00

106. ## math

classify each quadrilateral.use as many names as possible. a.square b.parellagram c.trapizoid d.a bit more skinnyer parallegram

107. ## geometry

I got this problem wrong on a test and i want to know how to fix it. In triangle ABC, angle A is 20 degrees and side AC is 7.89 units, find the other sides and angles

108. ## math

which quadrilateral has only one pair of parellel lines? need answer in 1 min.

109. ## calculus

sketch the curve of function y = (x-1)/ (x^2-x-6)

110. ## physics

We're in class with a SIL decibel meter up front, and everyone is screaming at the top of their lungs, hooting and shouting and pounding on their desks, shooting off firecrackers, its Phys 1240 gone wild...and the meter is reading a reasonably steady sound

111. ## Pre Calc Trig

Verify the following: tan( a + p/2) = -cot a a= alpha and p= pie since I do not have that button.

112. ## physics

--------------------------------------- A rugby player of mass 82kg is running at 6.0m/s. How much energy will be needed to stop him? ---------------------------------------

113. ## Chemistry

How much water can be produced from the complete reaction of 2.56 L of oxygen gas, at STP, with hydrogen gas answer in units of g.

114. ## Chemistry

How much water can be produced from the complete reaction of 2.56 L of oxygen gas, at STP, with hydrogen gas answer in units of g.

115. ## geometry

what is the chage in volume when the length of the shipping box increases from 5 feet to 6 feet?

116. ## Chemistry

How much heat energy is needed to transform 125g of ice at 0 degrees Celsius to warm water at 80 degrees Celsius?

117. ## Chemistry

1. How much heat energy is needed to transform 125g of ice at 0 degrees Celsius to warm water at 80 degrees Celsius?

118. ## Chemistry

If 3.00 mol of calcium carbonate is heated to produce calcium oxide and carbon dioxide, how many grams of calcium oxide are produced?

119. ## Chemistry

If 3.00 mol of calcium carbonate is heated to produce calcium oxide and carbon dioxide, how many grams of carbon dioxide gas are produced?

120. ## Math

The following data show the number of Chinese citizens who immigrated to the U.S. Use the data to predict how many Chinese immigrated to the U.S. during the 1990s. Decade No. of Chinese Immigrants 1950s 10,000 1960s 35,000 1970s 124,000 1980s 389,00

121. ## Chemistry

If 3.00 mol of calcium carbonate is heated to produce calcium oxide and carbon dioxide, how many grams of calcium oxide are produced?

122. ## Chemistry

1. How much heat energy is needed to transform 125g of ice at 0 degrees Celsius to warm water at 80 degrees Celsius?

123. ## chemistry

what gas law did you use to answer my questions earlier?

124. ## Spanish

1. _______ Tiene sólo nueve años. a. ¿es su prima? b. ¿tiene Ud. hambre? c. ¿cuántos años tiene? d. ¿cuántos años tienes? I think it is D, but I do not understand the significance of an S on the end of tiene. 2. Soy hija única; ______ a. no

125. ## English

Are there any compounds besides and,but,or,nor

126. ## grammar

Your Open QuestionShow me another » Combine sentences using the best coordinating conjunctions.? using and, but, or, for, nor,yet and sometimes so. here are the sentences and my answer. I was hungry. I ate. / my answer- I was hungry, so I ate. I will go.

127. ## math

2.1L over 13hours after 5 hours 1.5 liters remain. Is there an adjustment needed what should be the adjusted flow rate

128. ## Chemistry

if i place C6H14 and KI in a test tube, then some metal salt (MNO3) is added... If the M+ reacts with and oxidizes the I, What color is c6h14? I think its purple.. but im not sure why it would be that color .. :S .. care to explain please ? and if it

129. ## public health

Most of the increase in medical cost is due just to normal inflation that has affected the entire economy.” Comment on the above statement.

134. ## Physics

A sensitive gravimeter at a mountain observatory finds that the free-fall acceleration is 9.00×10−3 {\rm m/s^2} less than that at sea level.What is the observatory's altitude?

135. ## Science question

Will the evaporation of ocean water at the equator cause the ocean water to become more or less salty, why? Wouldn't it be because it evaporates, it will be more salty cause the fresh water is evaporating and the salt is left behind? Thanks -Allyson

136. ## Science question

How do oceans redistribute energy around the earth? Isn't this due to evaporation? Or.. the Coriolos effect? Could someone help me? Thanks -Allyson

137. ## math

What inequality represents this equation? brasstown bald mountain is highest point in GA at elevation of 1458 meters. what equation represents elevations of different parts in GA?

138. ## Spanish

Cada verano, las chicas _______ el sol. (There is a picture of two girls laying out at the beach tanning)

139. ## English

I need to interview a group of American 16-year-old-students who are visiting our school. I hope you can help me wiht the questionnaire. Thank you. 1) How often do you have English a week/during the week/every week/per week? 3) How much free time do you

140. ## Math

How do i graph and do this problem Y=x

141. ## physics

A car traveling at 98 kilometers an hour comes to a stop in 15 seconds. What is the car's acceleration in kilometers an hour per second

142. ## Chemistry

What happens when NaOH has been sitting for a couple of days without cover before starting the titration?

143. ## Chemistry

What happens if a student adds distilled water to a flask before starting the titration?

144. ## Chemisty

When the gases dihydrogen sulfi and oxygen react, they form the gases sulfu dioxid and water vapor. How od you write a balanced equation for the reaction?

145. ## chemistry

Potential of a cell is 0.1776 volts Pb|Pb2+(??M)||Pb2+(1.0M)|Pb I know i have to use Nernst's equation .. i just have no clue how to attempt this :S

146. ## geometry

what is the area of a rhombus with a 60 degree angle and sides 5 cm long? (round to the nearest 10th)

147. ## Math

The following data show the number of Chinese citizens who immigrated to the U.S. Use the data to predict how many Chinese immigrated to the U.S. during the 1990. Decade No. of Chinese Immigrants 1950s 10,000 1960s 35,000 1970s 124,000 1980s 389,000

148. ## physics

A typical steel B-string in a guitar resonates at its fundamental frequency at 240 Hertz. The length of the string is 0.620 m. What is the wave velocity along the string? Find your answer in m/s. What is the formula to solve?

149. ## science

i need to solve this : 1. we should show the chemical structure of oligosaccharide which contains 2 galactoses and 1 saccharose. 2. compare the difference in physical features og dicarboxylic acids and glucose beta chain 3. determine the calorific value of

150. ## geometry

the perimeters of 2 similar polygons are 20 and 28. One side of the smaller polygons is 4. What is the congruent side of the larger polygon?

151. ## science

what would happen if a large amt of light colored dust was added to the atmosphere? dark black soot from fire?

152. ## criminal procedure

officer Mike and Gail, while patrolling an area known to them as a high crime area, observed 2 men get out of a car after seeing the patrol car. the passenger ran from the scene while the driver began walking away from the car with his hands tucked inside

153. ## chemistry

How many grams of potassium fluoride are needed to make 250 mL of a 0.31 M solution in water?

154. ## chemistry

How many grams of potassium fluoride are needed to make 250 mL of a 0.31 M solution in water?

155. ## physics

A copper bar is initially 20 cm long at 10 degrees C. It is then heated to a temperature of 40 degrees C. What will be its new length?

156. ## Math

Can someone please calculate this: 48(-1/2)^6 The answer is 3/2, but I get 3/4. What am I dong wrong?

157. ## Math

A circular garden has an area of 25π m2 If the . radius is increased by two meters, and fencing is sold only in one meter sections, how much fencing is needed to keep out the rabbits?

158. ## math

what numbers would you use to estimate the sum of 47 and 21?

159. ## Chem 121

Use Hess's law and the reactions 1) CH 4(g)+ Cl 2 (g)--->CH 3 CL(g) + HCl (g) 2) CH 3 Cl (g) + Cl 2 (g)---> CH 2 Cl 2 (g) + HCl (g) to determine the enthalpy for the reaction CH4 (g) + 2CH 2 (g)---> CH2 Cl 2 (g) + 2HCl (g)?

Am not that great in math. Describe the different methods that can be used to find the product: (2x-5)(3x-1). I know there is the foil method. Describe the different methods that can be used to find the product: (5x+1)^2

161. ## English

I included other questions. Can you please help me improve them? Thanks a lot. 1) Do you like staying with your host family? Do you think you will miss them once back in America? 2) What will you miss most about your staying in Italy? (Your host family,

162. ## Economics

You are a utilitarian social planner and have a very limited number of vaccines to a new and potentially deadly virus. How do you allocate them? Do you: (A) give them to specific groups, such as high-risk populations, or (B) sell them to the highest bidder

163. ## math

Two angles with measures (5x+7) and (15x-7) are supplementary. What is the value of X?

164. ## Spanish

A usted _______gusta jugar a los deportes. What goes in the blank?

165. ## Algebra

How can you tell whether a polynomial is written in factor form. Construct a trinomial whose greatest common factor is 2x^2. Am not understanding this...Please help.

166. ## math

Class has 28 students. 23 like basketball. Also, 15 like baseball. 12 like both. How many students do not like either.

167. ## equal to greater than and less than

bryce and jewel were playing with kick balls in gym class. Bryce kicked seven tenths of the kick balls into the net. Jewel kicked twenty three thirtieths of the balls into the net. Which athlete scored more goals?

168. ## math

Danish used 9 balls of clay and 16 straws to make a solid pyramid. How many faces does the solid have?

169. ## Physics

two point masses are located in the same plane. the distance from mass 1 to the center of mass is 3.0m. The distance from mass 2 to the center of mass is 1.0m. What is m1/m2, the ratio of mass 1 to mass 2?

170. ## math

find the percent notation for 0.046

171. ## Physics- 2D Collisions

nitially, mass one (2.10 kg) has a velocity of 5.90 m/s and mass two (2.80 kg) is at rest. After they collide, mass one emerges at an angle theta = 33.0 degrees. What is the speed of mass one after the collision if the collision is completely elastic?

172. ## Physics

Find the speed at which Superman (mass=88.0 kg) must fly into a train (mass = 17998 kg) traveling at 60.0 km/hr to stop it. Running into the train at that speed would severely damage both train and passengers. Calculate the minimum time Superman must take

173. ## Math

You received scores of 70, 40, 70, 90, and 40. Find the first quartile. I don't even know what a quartile is.

174. ## Physics

A tennis ball of mass 0.0609 kg is served. It strikes the ground with a velocity of 52.5 m/s (117 mi/h) at an angle of 22.0° below the horizontal. Just after the bounce it is moving at 50.5 m/s at an angle of 17.7° above the horizontal. If the

175. ## science

A cylindrical bottle of oil-and-vinegar salad dressing whose volume is 1/3 vinegar (p=1.01 g/cm^3) and 2/3 oil (p=.910 g/cm^3) is at rest on a table. Initially the oil and the vinegar are separated, with the oil floating on top of the vinegar. The bottle

176. ## physics

The orbit of Halley's Comet around the Sun is a long thin ellipse. At its aphelion (point farthest from the Sun), the comet is 5.1 1012 m from the Sun and moves with a speed of 12.0 km/s. What is the comet's speed at its perihelion (closest approach to the

177. ## math

Katie is creating cakes using 4 colors. If she creates 'x' cakes using each color. How many did she create? Write an algebraic expression for this problem.

178. ## Physics

The generator at a power plant produces AC at 24,000 V. A transformer steps this up to 480,000 V for transmission over power lines. If there are 2,000 turns of wire in the input coil of the transformer, how many turns must there be in the output coil?

179. ## social studies

Describe the evolution of integration movement in the Caribbean

180. ## job fair questions

are performance appraisals necessary why how do they enhance future performance

The area shaded is the matting and it is 64 square inches. What side length of a picture frame do you need to cover the entire picture? There is a 6inch square opening in the matting.

182. ## Criminal Law

Should someone be force to testify or why should they testify even if they are under oath? I thought that the 5th or 6th amendment protects a person from testify even if they have nothing to hide. Is this true? Which amendment give an individual the right

183. ## English

I added a few more sentences. I hope you can help me express them correctly. Thank you. 1) Do you like soccer (Italian football)? Is soccer popular in America? 2) Can you watch the Italian football season in America? (Do you follow the Italian football

184. ## Physics

What is the frequency of an EM wave emitted most strongly by a glowing element on a stove with temperature 1500 K?

185. ## english- macbeth

well i have a couple of questions about the tragedy of macbeth that i have no clue how to answer so if you could lend me some help i'll appriciate it. it's act 2: Q1) Though Macbeth encounters no actual opposition until long after Duncan is murdered,

186. ## chemistry

a 25.0 sample of nitrogen has a volume of 50.0L and a pressure of 630. mmHg. what is the temperature of the gas?

187. ## Pre-calc

how many radians are displaced by the minute hand of a clock between 1:00 pm and 6:45 pm of the same day

188. ## Physics

An elevator is moving down with an acceleration of 2.46 m/s^2. What would be the apparent weight of a 66 kg man in the elevator?

2+2=

190. ## US History. Please, help.

How were President Truman and President Eisenhower similar? How were President Truman and President Eisenhower different?

191. ## Chemistry.

The complete combusion of 0.5763 grams of glucose in a bomb calorimeter (Cbomb = 6.20 kJ/degrees C) raises the temperature of the calorimeter by 1.45 degrees C. what is the food value of glucose in calories per gram? (Hint: remember 1 Cal = 4.184 kJ) i do

192. ## math

Algebra:Functions Tell whether each represents a function. Explain. Area=LenghtxWidth

193. ## algebra 2

Find the 5th term of the expression 1) (a-b) ^9

194. ## math (word problem)

Suppose a car tire has a diameter of 26 inches. How many rotations will thee tire make if the car travels 1 mile? Round to the nearest tenth. If you get answer please show work of how to get there. Thanks!

195. ## home economics

what is an extraction rate

I learn about canada government. I from India. There questions I don't understand. 1. Why do some politicians think that the senate should be reformed? Identify a possible solution to the issue of Senate reform.

197. ## math

what is 132+45=?

198. ## chemistry

you add 0.05ml of 0.10M agno3 to 4ml of 2.0 nacl it forms saturated solution of agcl ag+ + cl- using a saturated solution you set up ag | ag+( test solution after reaction) || ag+(1.0ml) | ag how do we calc the equilibrium of ag+ of the test solution after

199. ## Physics

A 0.125-kg baseball is dropped from rest. If the magnitude of the baseball's momentum is 0.750 kg * m/s just before it lands on the ground, from what height was it dropped?

How are Vancouver and Paris different from one another? Ive got to name atleast 8 differences between them. 1. Paris has a population over 2 million, unlike Vancouver which only has a couple thousand. 2.The night life is different. The way the French

201. ## physics

In a typical golf swing, the club is in contact with the ball for about 0.0010s. If the 45-g ball acquires a speed of 41 m/s, estimate the magnitude of the force exerted by the club on the ball.

202. ## Spanish

The peoms are written that way I'm just not sure of the accent marks of some words. If you can help me,that would be great and also explain the accent marks more. that would help me in future. Thanks! First poem No sé qué te diera, por una mirada… un

203. ## Physics

When spiking a volleyball, a player changes the velocity of the ball from 4.5 m/s to -20 m/s along a certain direction. If the impulse delivered to the ball by the player is -9.7 kg * m/s, what is the mass of the volleyball?

204. ## Comm 155

I need help identifying the adverbs and adjectives. I am not sure which are which. Can someone please help me figure this out? In my early years, I was not really thinking about the importance of credit. My credit was severely damaged as a result. Over the

205. ## Science

describe how our solar system formed.

206. ## FRENCH

Si tu allais a Paris, que verrais-tu et pourquoi? I want to say that,, I would like to go to the louvre and see the painting of the mona lisa because its really famous.

207. ## us history

how is the 1860 vote of Missouri related to its stand on the question of secession?

208. ## Physics

A 5.00x10^2-g block of metal absorbs 5016 J of heat when its temperature canges from 20.0 C to 30.0 C. Calculate the specific heat of the metal ..?

209. ## chem

Consider the reaction that occurs on mixing 50.0 mL of 0.560 MNaHCO3 and 50.0 mL of 0.400 M NaOH at25oC. (a) Write a balanced net ionic equation for thereaction. (b) What is the pH of the resulting solution? (c) How much heat (in joules) is liberated by

210. ## Maths

If in a right angle triangle r=30cm and y=18cm wat is x?

Monuments in Paris... -Grand Palais -Saint Chapelle -Le Louvre -Mur de la Paix -Notre Dame Any others that are well known?

212. ## Math/Corrdinate Plane

I need help with a worksheet that has a line going down with a y with positive numbers at the top and negative numbers at the bottom and the it has a line going across with an x with negative numbers on left and positive on right. It has a tic tac toe

213. ## Pre Calc

ln (x^2 +x-12)=3ln2

What is the quarter of the artists called in Paris? Is it the Pantheon?

215. ## Math

.5ln(x+3)-lnx=0 Thanks for any help!!! :)

asked by Desprate need of Help!!

how are vancover and paris alike? They are both well know, good tourist attraction sites, have many things to explore. Filled with amusement. Umm... would like more ideas..

217. ## physics

A merry-go-round of mass 1640kg has a radius of 7.5m. How much work is required to accelerate it from rest to a rotation rate of 1 rev. per 8 seconds? (assume a solid cylinder) /

218. ## ALGERBRA

CAN YOU PLEASE TELL ME THE SOLUTION FOR THE FOLLOWING 5X>-4 BUT THE SIGN HAS A LINE UNDER IT I REALLY NEED HELP

219. ## Physics

A submarine has run into trouble and is stuck at the bottom of the ocean. Several people are on board and must make their way to the surface without any diving gear. The air pressure aboard the submarine is 3.100 atm. The air temperature inside the

I am desperately trying to help my 5th grader figure out how many ways can we make this equation true 24 x 18 = 432 x

221. ## History

In the 1950's, how did some corporations expand to protect themselves against the dangers of economic downturn?

241. ## Government

If a person had to prove his or her innocence instead of the government how would our legal system differ?

242. ## Spanish

1.Choose the correct past participle for the Spanish verb cantar. A. canté B. cantaba C. cantado D. canto C is my answer. 2. Choose the correct past participle for the Spanish verb salir. A. salía B. salió C. salido D. sale C is also my answer. Choose

Sally makes an ice cream sundae. She can choose from vanilla, chocolate, or strawberry ice cream, fudge or caramel topping, and sprinkles or nuts. Write an expression to show how to find all the different combinations. I'm not sure how to do this. Any help

244. ## Investment

If the theoretical probability of rolling a 3 is 1/6, what is the experimental probability of rolling a 3 if the cube is rolled 300 times? Need a formula to show answer.

Need to write whether the verb in Transitive or Intransive. 1. John received a silver trophy. A=trans 2. The judge gave him a check for $100. A=trans 3. The contestants all played well. Answer=intrans 4. Thomas won a silver plate in a different competion. asked by Emily 247. ## 6grade math How many millimicrons are in 2.5 meters asked by Aaron 248. ## algebra 2 Find the 5th term of the expression (r+s) ^10 asked by tris 249. ## 5th Grade Math/Making a Duplicate I need help with a worksheet that has a line going down with a y with positive numbers at the top and negative numbers at the bottom and the it has a line going across with an x with negative numbers on left and positive on right. It has a tic tac toe asked by Schwann 250. ## Math what is the circumference of a circle that has a diameter of 16 mi? asked by Judy 251. ## chemistry given the density of acetic anhydride to be 1.05 g/mL, what was the mass of the acetic anhydride added to the reaction? How many moles of acetic acid were added? asked by kendalyn 252. ## Health I have a female red eared slider that has swollen eyes. I found out that it has a disease. I do not know where to get the antibiotics to help treat this disease and care for my turtle. If you know of any places or things I can do to help my turtle, then asked by Ann 253. ## algebra 2 find the 5th term for the expression (u+2v) ^4 asked by tris 254. ## Chem Can you show me step by step how to do the following problems? How many grams of KI are in 25.0 mL of a 3.0 % (m/v) KI solution? How many milliliters of a 2.5 M MgCl2 solution contain 17.5 g MgCl2? asked by Kariann 255. ## Physics A 14,300 N car traveling at 46.0 km/h rounds a curve of radius 2.30 x 10^2 m. What is the minimum coefficient of static friction between the tires and the road that will allow the car to round the curve safely? asked by Becky 256. ## Human Development Blake amuses and challenges his teachers with his independent thinking. He’s self-reliant and responds appropriately to corrections and criticism. Blake’s parents probably use the _______ style of child rearing. A. permissive C. authoritative B. asked by smith 257. ## Physics A pulley system is used to lift a piano 2.6 m. If a force of 2510 is applied to the rope as the rope is pulled in 14 m, what is the efficiency of the machine? Assume the mass of the piano is 750 kg. I know the equation is eff = Wout / Win I'm just confused asked by Becky 258. ## geometry am building a birdhouse. the bottom is 5" wide by 7" long. the sides are 7" long, and cut at a 45 degree angle. I need to find the dimensions of the front and back, which must sit at the diagonal. asked by Clark 259. ## trig Given a right triangle with legs 8 and 5, find the measure of the two acute angles. (Round to the nearest hundredth asked by kristy 260. ## trig A passenger airplane flying at an altitude of 1.8 km starts its final airport approach by descending at an angle of depression of 6°. How far along the ground is the airplane from its landing point asked by kristy 261. ## Math I have to do a 4x4 magic square with the digits 2011 so that each row column and diagonal contains one 2 one 0 and two 1s. But the hard part is that the sum of each row column and diagonal has to be 4. Please help if you can i've been at it for hours and asked by Natasia 262. ## trig Use the appropriate cofunction to find an equivalent expression for cos 54° cot 24 sec 32 sin 36 csc 44 asked by kristy 263. ## daily-life what is a cash deposit asked by sadaf 264. ## Chemistry What quantity of HNO3 can be neutralized by 0.1L of 0.50 m NaOH asked by Omar 265. ## Chemistry What quantity of HNO3 can be neutralized by 0.1L of 0.50 m NaOH asked by Omar 266. ## 7th grade math Sally makes an ice cream sundae. She can choose from vanilla, chocolate, or strawberry ice cream, fudge or caramel topping, and sprinkles or nuts. Write an expression to show how to find all the different combinations. I'm not sure how to do this. Any help asked by hunter 267. ## Physics A small drop of water is suspended motionless in air by a uniform electric field that is directed upward and has a magnitude of 8380 N/C. The mass of the water drop is 3.40 10-9 kg. How many excess electrons or protons reside on the drop? asked by Anonymous 268. ## chemistry formulas para determinar las cantidades y proporciones o porsentage de los componentes de una mescla. asked by salvador 269. ## chemistry formulas para determinar las cantidades y proporciones o porsentage de los componentes de una mescla. asked by salvador 270. ## News Is the situation in Libya similar to what happened in Egypt? Why? asked by Ann 271. ## chem Consider the reaction that occurs on mixing 50.0 mL of 0.560 MNaHCO3 and 50.0 mL of 0.400 M NaOH at25oC. (a) Write a balanced net ionic equation for thereaction. (b) What is the pH of the resulting solution? asked by pal 272. ## Math Solve the proportion for x. round your answer to two decimal places. 2x/x+10=0.04/1.85 asked by Camille 273. ## statistics Assume that you own a small factory. A critical piece of machinery in your factory will need to be replacedin 180 days. If the machinery does not show up on time, you will need to shut down until it arrives. This might cause you to permanately lose asked by Bri 274. ## math find the slope of the line given by each equation (1) 7x+13y=91 (2) 7-3y=9x asked by roy 275. ## Accounting A company has two major businesses that it operates. One business manufactures and sells unicycles for commercial use in circuses and so forth (total sales of$150M), and the other sells bicycles to the public (total sales of \$20M). The unicycle business

Robert is writting a poem. The poem is divided into 5 stanzas and is on 2 pages. There are 60 lines in the poem. How many lines are in each stanza? show work please

277. ## science

(1) what measurements and what calculation would you need to make in order to determine the density of a rectangular wooden block? (2)

278. ## News

Why did another earthquake(6.6) happen in Japan? Was it an aftershock?

279. ## math

directions solve the multiplication/division puzzle. fill in the blanks. x,/ 40 600 8 ______ ______ 7 _______ _______

280. ## math - Calc optimization

You are an engineer in charge of designing the dimensions of a box-like building. The base is rectangular in shape with width being twice as large as length. (Therefore so is the ceiling.) The volume is to be 1944000 m3. Local bylaws stipulate that the

You want to bring up concerns about security with your brother. Joseph asks you, "If the Internet is inherently not secure, then why are so many business, government, and military transactions being processed online?" Your brother feels that the security

282. ## science

(1) what measurements and what calculation would you need to make in order to determine the density of a rectangular wooden block? (2) a student announced that she had made a sample of a new material that had a density of 0.85g/cm3. from the inforation

283. ## english - Contrast Advertising

What are some companies that sell produtcs to the average consumer?

284. ## Algebra

Square root of 14abc times the square root of 2ab

285. ## PHYSICS

5.00x 10^-2 mass with charge +0.75 micro coulombs is hung by a thin insulated thread. Charge of -0.9 micro coulombs is held .15meters directly to the right so that the thread makes an angle with the vertical. What is the angle and the tension in the

286. ## Geometry

Find the area of the polygon with vertices at (1,3) , (7,3) ,(7,7) and (4,7)?

287. ## phYSICS

the process of charging a conductor by bringing it near another charged object and then grounding the conductor is called... a) charging by contact b) induction c) charging by polarization d) neutralization which one of the following statements is true

288. ## Pre calc

.5ln(x+3) - lnx=0

289. ## Chemistry

In a mountainous location, the boiling point of pure water is found to be 95°C. How many grams of sodium chloride must be added to 9 kg of water to bring the boiling point back to 99°C? Assume that i = 2. So what will my answer be in grams?

290. ## Chemistry

Urea, (NH2)2CO, is dissolved in 73.5 g of water. The solution freezes at -0.095°C. How many grams of urea were dissolved to make this solution? (Answer must be in grams)

291. ## geometry

what is the area of a rhombus with a 60 degree angle and sides 5 cm long? (round to the nearest 10th)

292. ## math

circle has a center at (-8,-4) and circumference of 32.determine equation of the circle

293. ## Communication Arts

I don't get it... It says "Look at the list of words. Rewrite them in the appropriate categories. Circumference, Monosyllabic, Commune, Epidural, Detrimental, Epicenter, Devastate, Circumnavigate, Community, Monogamy Categories: (Around) (Opposite, From,

294. ## Chemistry

You mix 1.00 L of 2.00 M BaCl2 with 1.00 L of 2.00 M AgNO3. What compounds remain in solution, and what are their concentrations?

295. ## Chemistry

a mixture of methane CH4 and ethane C2H6 is stored in a container at 294 mmHg. The gases are burned in air to form CO2 and H2O. If the pressure of CO2 is 346mmHg at the same temp and volume as the original mixture, calculate the ratio of moles of CO2

296. ## Chemistry

a mixture of methane CH4 and ethane C2H6 is stored in a container at 294 mmHg. The gases are burned in air to form CO2 and H2O. If the pressure of CO2 is 346mmHg at the same temp and volume as the original mixture, calculate the ratio of moles of CO2

297. ## chemistry

a solution contains 100g. H2O, 10g. NaCl and 15g. of methanol. What is the weight percent of methanol; in the solution?

298. ## General

Are their any search engines I can use besides bing and google? Any places I can access historical journals? Thanks!

299. ## ETH

Should United States government policy favor certain kinds of immigrants?

300. ## chemistry

If a bottle of nail polish remover contains 179 mL of acetone, how much heat would be released by its complete combustion? The density of acetone is 0.788 {\rm{g}}/{{\rm{mL}}}

301. ## chemistry

What is the pH of a solution prepared by dissolving 6.0 g of HCl in water to make 415 mL of HCl solution?

302. ## Literature. The Odyssy

What are 3 reasons Odysseus was an epic hero?

303. ## geometry

An Equilateral triangle (ABC) is inscribed inside a circle. The side lengths of the triangle are 8 cm. What is the radius of the circle?

use backtracking to solve each e quations ?. 2x +1=9, 7k-3=32, 5(n-8)=25 2(2t-1)=14 8x-1=63 ,2x-5=15,

find a solution method use backtracking to solve equation; 54=6 (4-7V) _______ 2 7b+1 =2 __________ 4 8(56+12 -1) =64 _____3______

306. ## algebra

A cable 25 feet long runs from the top of a utility pole to a point on the ground 18 feet from the base of the pole. How tall is the utility pole?

307. ## English

e.g. Can you repeat what he said? 1. Can you repeat the thing which he said? (what =relative pronoun) 2. Can you repeat___? + What did he say? (what=interrogative pronoun) (What does the example sentence mean? Does it mean #1 or #2? Is 'what' a relative

3#3 - 8

309. ## trig

solve csc^2x=3 for all possible solutions

310. ## Chemistry

A beaker with 200 mL of an acetic acid buffer with a pH of 5.00 is sitting on a benchtop. The total molarity of acid and conjugate base in this buffer is 0.100 M. A student adds 6.40 mL of a 0.400 \it M \rm HCl solution to the beaker. How much will the pH

311. ## Pre-Cal

Four couples have reserved seats in a row for a concert. How many ways can they be seated if the two members of each couple wish to sit together? How do I go about doing this problem? I'm not sure what/how I should multiply this out...

312. ## Math

what is 1/5 in base 5?

313. ## physics

A 14 kg body is moving through space in the positive direction of an x axis with a speed of 220 m/s when, due to an internal explosion, it breaks into three parts. One part, with a mass of 6.4 kg, moves away from the point of explosion with a speed of 190

314. ## phySICS

PHYSICS when a positive charge moves under the influence of an electric field's electrostatice force, what happens to the electrical potential energy of that charge?

315. ## math

You meet a woman who tells you. "I have two children. One of them is a boy." What is the probability that both children are boys?

316. ## Chemistry

If you have constant volume of gas how can you determine the number of moles it has? what equation do you use if your not given the constant volume value?

317. ## stoichiometry

How many moles of hydrogen are needed to completely react with 2.0 moles of nitrogen? N2 + 3H2 -- 2 NH3

318. ## math

pauline has 35 cups of flour. She makes cakes that require 2 1/4 cups each. if she makes as many such cakes as she has flour for, how much flour will be left over?

319. ## Math

Using only whole numbers, how can you draw three rectangles with a perimeter of 12 units?

320. ## Chemistry

If 25.5 grams of NaOH is dissolved in 750 ml of water, find: [H+]= [OH-]= pH= pOH=

321. ## chemistry

Calculate the Rate constant, k, at 20 degrees C and 30 degrees. run 1-3 slope avg is .03439 slope at 30 degrees is .10554

322. ## Chem I

How many moles of carbon atoms are found in 6.24 x 10^22 carbon atoms?