# Questions Asked onMarch 10, 2013

1. ## Math

A cylinder shaped can needs to be constructed to hold 400 cubic centimeters of soup. The material for the sides of the can costs 0.03 cents per square centimeter. The material for the top and bottom of the can need to be thicker, and costs 0.06 cents per

Complete each sentence with the correct form of the verb in parentheses. 1. La clase de matemáticas (terminar) a las cuatro. 2. ¿Te gusta (estudiar) psicología? 3. La profesora (explicar) el mapa. 4. Necesito (comprar) el libro de español. 5. Ustedes

3. ## Physics

A plate carries a charge of -3.2 µC, while a rod carries a charge of +1.5 µC. How many electrons must be transferred from the plate to the rod, so that both objects have the same charge?

4. ## Chemistry

Phosphoric acid, H3PO4(aq), is a triprotic acid, meaning that one molecule of the acid has three acidic protons. Estimate the pH, and the concentrations of all species in a 0.300 M phosphoric acid solution. kPa1: 2.16 kPa2: 7.21 kPa3:12.32 [H3PO4] = ?

5. ## Stats

A roulett wheel has 38 slots in which a ball can land two of e slots are green, 18 are red, 18 are black. The ball is equally likely to land in any slot, and each spin of the wheel is assumed to be independent. A)if the wheel is spun twice what is the

6. ## Statistics

A private opinion poll is conducted for a politician favors decriminalizing marijuana possession. How large a sample is needed in order to be 95% confident that the sample proportion will not differ from the true proportion by more than 2%.

7. ## chemistry

Plastic articles can be chromium-plated by coating them with thin layer of graphite paste,placing them in a bath of aqueous chromium(III) sulphate and electroplating. a)Suggest a reason why the article is first coated with graphite. b)what substance could

8. ## chemistry

What mass of F2 is needed to produce 116 g of PF3 if the reaction has a 77.4% yield?

9. ## Chemistry

Which of the following represent conjugate acid-base pairs? For those pairs that are not conjugates, write the correct conjugate acid or base for each species in the pair. a. HS-4-,SO4^2- B. HBr, BrO- c. H2PO4-, PO4^3- d. HNO3, NO2-

10. ## maths

Positive square root of 7+root 48 is ????

11. ## chemistry

The formula weight of an acid is 82. In a titration, 100cm3 of the solution of this acid containing 39g of this acid per litre were completely neutralized by 95 cm3 of aqueous naoh containing 40g of naoh per litre. What is the basicity of this acid? Bob

12. ## chemistry

Ethanol, C2H5OH, is being promoted as a clean fuel and is used as an additive in many gasoline mixtures. Calculate the ΔH°rxn for the combustion of ethanol. ΔH°f [C2H5OH(l)] = -277.7 kJ/mol; ΔH°f [CO2(g)] = -393.5 kJ/mol; ΔH°f [H2O(g)] = -241.8

13. ## Physics

A 250N force is applied at an angle of 32 degrees above the horizontal to a 96kg box causing it to slide along a floor. The coefficient of friction between the box and the floor is 0.18. What is the magnitude of the net force on the box? The answer is 67N,

14. ## chemistry

For the reaction 2A(g) + B(aq) + 3C(l) D(s) + 3E(g), the concentrations at equilibrium are found to be: A: 2.3x10^3 Pa B: 1.8x10^-2 M C: 15.8M D: 12.5M E: 5.6x10^4 Torr Find the numerical value of the equilibrium constant that would appear in a

15. ## chemistry

7750 Joules of energy is added to a 325 grams stone at 24.0 degrees centigrade. The temperature increases by 75.0 degrees centigrade. What is the specific heat of the stone?

16. ## physics

A wire that is 70 cm long, carrying a current of 6.5 A, is at right angles to a uniform magnetic field. The magnitude of the force acting on the wire is 0.60 N. What is the strength of the magnetic field?

17. ## chemistry

Find the concentration of Ag+ in a saturated solution of AgBrO3 that also contains 0.02M LiNO3, 0.02M KClO4 and 0.01M NaF.

18. ## Algebra 1

Sarah took the advertising department from her company on a round trip to meet with a potential client. A total of 9 people took the trip. She was able to purchase coach tickets for $380, and first class tickets for$1070. She used her total budget for

19. ## chemistry

1L of a buffer composed of acetic acid and sodium acetate has a pH of 4.3. Adding 10mL of 2M sodium hydroxide solution to 100mL of this buffer causes the pH to rise to 4.87. what is the total molarity of the original buffer?

20. ## Math

Mark bought four times as many apples as Harry and three times as many apples as Martin. If Mark, Harry, and Martin purchased less than a total of 190 apples, what's the greatest number of apples that mark could have purchased?

21. ## physics

A sinusoidal voltage Δv = (65 V) sin (140t) is applied to a series RLC circuit with L = 100 mH, C = 175 μF, and R = 42 Ω. (a) What is the impedance of the circuit?

22. ## algebra URGENT HELP

form a polynomial whose degree and zeros are given. don't expand a) degree 3,zeros,-2,0,4 b)degree 4,zeros, -2 multiplicity 3,1 multiplicity 1 solutions a)p(x)= x(x+2)(x-4) B)p(x) =(x+2)^3(x-1)

23. ## math

There is a slide in the park that is 18 feet long. The ladder to the top of the slide is 7.5 feet long. If the ladder and the slide are perpendicular, what is "D", the distance from the top of the slide to the ground? Explain how you got your answer.

24. ## Stats

Directions: Suppose you have a standard deck 52 cards (4 suits: hearts, diamonds, clubs, and spades each suit has 13 cards (1/4 of the deck) and those 13 cards include one ace,and numbers 2 through 10 and 3 face cards: a jack a queen and king) suppose you

25. ## physics

A rubber band has a"spring constant" of 45 N/m. When the rubber band is pulled by a force of 9.8 N , how far will it stretch and what is potential energy?

26. ## math

a ball tossed to a height of 4 meters rebounds 40% of its previous height. the total distance travelled by the ball by the time it comes to rest is?

27. ## maths

13-a*root 10 whole root = root 8 + root 5 then a equals to ???

28. ## Physics

An alpha particle (charge +2e and mass 6.64 x10-27 kg) is traveling to the right at 1.50 km/s. What uniform electric field (magnitude and direction) is needed to cause it to travel to the left at the same speed after 2.65 s.?

29. ## Physics

An alpha particle (charge +2e and mass 6.64 x10-27 kg) is traveling to the right at 1.50 km/s. What uniform electric field (magnitude and direction) is needed to cause it to travel to the left at the same speed after 2.65 s.?

30. ## Chemistry

How will the addition of sodium acetate to an acetic acid solution affect the pH? A. solution becomes hotter B. It will lower the pH C. It will raise the pH D. pH will not change E. pH cannot be measured I selected answer D and got it wrong. I don't

31. ## Science

What property of water causes a water droplet to be shaped like a dome? Also can you please explain these words? Surface temperature, surface area and surface tension.

32. ## physics

the olympic record for the marathon is 2.00 h 9.00 min 210 s. if the average speed of a runner achieving this record is 5.436 m/s, what is the marathon distance

33. ## Physics

Your grandfather clock’s pendulum has a length of 0.9930 m. If the clock loses 95.6 seconds per day, by how many millimeters should you adjust the length of the pendulum?

110. ## math

2x+3y=13 5x+2y=16

111. ## physics

The unitary rotation corresponding to this gate looks as follows: (assuming the first qubit is the control qubit)⎛⎝⎜⎜⎜⎜⎜⎜⎜⎜⎜⎜⎜100001000010000100000000000000000000000000000000A⎞⎠⎟⎟⎟⎟⎟⎟⎟⎟⎟⎟⎟

112. ## Science

What is my control in my science experiment I am running mice and hamsters threw a maze to which one can do it faster I can't figure out my control though?

113. ## Sentences

HOW DO YOU USE "PRIMARY ECONOMIC ACTIVITY" IN A SENTENCE?

114. ## science

In the laboratory small zircon crystals were separated from granite (K). Isotopic analysis of these zircon crystals gives a 207Pb/235U ratio of 0.45. the half-life of 235U (7.04 × 108 years), estimate the age of the granite in Ma to two significant

115. ## geometry

#24. A cylindrical water well is 1,200 ft. deep and 6 in. across. Find the lateral surface area of the well. Round to the nearest square foot. (Hint: Convert measures to a common unit.)

116. ## algebra

I have to solve this equation using substitution. 3x+5y=10 2x+ 1/2y=24 This is all one problem

117. ## Math

The ratio of black squirrels to brown squirrels is 8 to 13 If there were 231 total squirrels what percent to the nearest whole percent were black? And how many squirrels were brown?

118. ## Math urgent

If 3 consecutive integers add up to 27 , find the smallest of them. ( the answer is 8) but can you show me how pkeasee

119. ## Chemistry

How do I find the number of particles in 1 pound of NH3(Ammonia)?

120. ## science

name two physical properties of an object about which you can gather qualitative data

121. ## grammar..

1. How do I cite quotations of a play? 2. How do I punctuate block quote? *****EXAMPLES WOULD BE HELPFUL!

122. ## science

ms.sue is qualitative data the same thing

123. ## math

4. Jenny swam 50 meters in 25 seconds. Which rate below is equivalent to Jenny's rate? (1 point) 1,200 meters in 8 minutes, 20 seconds 200 meters in 2 minutes 400 meters in 3 minutes, 20 seconds 800 meters in 4 minutes

124. ## Algebra 2 ...

* Simplify. a to the power of 4/3 times c ^1/6 all over 9b^3..... everything is in the parenthesis and is raised to the power of -2....times the whole thing to, a to the power of 3 times b to the power of two all over 3c.... everything is in the

125. ## science

how much sugar is dissolved in 50grams of a solution if the solution is 20% sugar by mass

126. ## science

what is qualitative data

127. ## math

how to substitute 3x+y=11 4x-5y= -22

128. ## Physical science

How much work is required to stop a car that is 800.0 kg car that is traveling at 20.0 m/s?

129. ## biochem

You have the following stock solutions and solid chemicals in your lab: 1.5M NaCL 0.2M Tris buffer, pH 8.0 10 mg/ml Bovine serum albumin (BSA) MgCl2 (solid, anhydrous) MW = 95.211 g/mole (95% pure) How would you make 250 ml of the following solution: 0.2M

130. ## Physical science

For magnitude of the force is 67n and force of friction is 34n

131. ## Physical science

How much work is required to stop a car that is 800.0 kg car that is traveling at 20.0 m/s?

132. ## life orientation

Name 3 different systems of media ownership that can be found worlwide.Name a country where each system can be found

133. ## Physics

A box is held against a wall (not resting on the ground). What minimum horizontal force will JUST prevent the 5.0kg box from sliding if the coefficient of friction betweent he wall and the box is 0.65?

134. ## chemistry

1L of a buffer composed of NaHC2O4 and Na2C2O4 has a pHof 4.0 and a total molarity of 1. a). what would the effect on the pH be of adding 1 gram of sodium hydrogen oxalate to this buffer? b). what would be the effect on the pH of adding 1 gram of sodium

1)A runner's finishing time translated into a z-score of z=2.6 Explain in words whether the runner performed excellently or poorly? 2)Yearly stock returns on India's Sensex Index are well described by a Normal model with a mean of 18.36% and a standard

136. ## Chemisrty

How many kilojoules of heat are absorbed when 40.7g of MgO(s) is decomposed into Mg(s) and O2 (g) at constant pressure?

137. ## Sciience

The number of pounds gained during pregnancy are normal with mean=30.23 and st. deviation=13.84 Determine the percent of women that gain between 20 and 30 pounds.

139. ## Physical Science

A 250.0 kg roller coaster has 2.000 x 10^4 Joule of potential energy at the top of the hill , if the track is frictionless , what is the coasters velocity at the bottom of the hill?

140. ## algebra URGENT HELP

A)p(x)= x(x+2)(x-4) b)p(x)=(x+2)^3(x-1)

141. ## Calulus

Given \displaystyle \int_0^{\frac{3\pi}{2}} x^2\cos x \, dx = a - \frac{b\pi^2}{c}, where a, b and c are positive integers and b and c are coprime, what is the value of a + b + c?

142. ## Physics

You launch a model rocket up into the sky. Right after launch the rocket is accelerating upwards at 10~m/s^2. What is the magnitude of the net force in Newtons on the rocket if the rocket has a mass of 0.1 kg?

143. ## Math

Austin is in his pedal boat. It takes him 1.5 hours to travel 12 miles downstream and 6 hours to return. What is the rate of the current? Please show me how to solve it as well, I really have no idea. Thanks.

144. ## language

preschoolers usually begin to add endings such as huh and okay to their questions around age. "

145. ## Health

Do you need a facebook and/or twitter account to have a socialGO?

146. ## english iii

why did john choose the room in the yellow wallpaper?

147. ## Statistics

Suppose. Population of test-scores is normally distributed with mean 65 and standard deviation 13 x~n (65,13) if you select a test at randome what is the probability that the score is below 60 or that it is between 65 and 70 please show work!

148. ## physics

If a baseball moving at 96 m/s toward homeplate over a distance of 16 m how much force does it take to make the ball go 50 m from home plate after it is hit?

149. ## Physical science

a 5.0 x 10^1g piece of a metal in thermal equilibrium with boiling water is removed and placed in 1.0 x 10^2g of a cooling water bath (specific heat= 1.00cal/g degrees celsius at 20.0 degrees Celsius . The final temperature of metal and the water bath is

150. ## Algebra 2....

Simplify.(Is this problem more clear than the previous post?) First part.. a^4/3 times c^1/6 all over 9b^3...everything is in the parenthesis and is raised to the power of -2 MULTIPLY TO THIS SECOND SET: a^3 times b^2 all over 3c.. everything is in the

151. ## math

3y+11=x 5x+3y==19 use subsittution

152. ## Math

WHAT SCHOLARSHIPS INVOLVE IN MATHEMATICS?

153. ## Termilogy

HIPAA guidelines related to medical transcription and transcription reports.

154. ## physics

How far from the center of the Earth must a 90 kg astronaut be in order for them to weigh 90 N? The mass of the Earth is 6 x 1024 kg.

155. ## physics

How far from the center of the Earth must a 90 kg astronaut be in order for them to weigh 90 N? The mass of the Earth is 6 x 1024 kg.

156. ## Science

Eighty calories must be added to one gram of I've at zero degrees Celsius to melt it. Whst is the approximate mechanical equivalent of this amount of energy?

157. ## Physics - URGENT

A car is speeding at constant velocity of 30ms-1 in an 80kmh-1 zone as it passes a stationary police motorcycle hiding. The motorcycle starts to accelerate at 5ms-2 at the same instant the car passes it and continues for 8 seconds. It then stops

158. ## Science

Liquid Nitrogen boils at -196 degrees Celsius . What is the temperture on the Kelvin scale ?

159. ## Physics - URGENT

A car is speeding at constant velocity of 30ms-1 in an 80kmh-1 zone as it passes a stationary police motorcycle hiding. The motorcycle starts to accelerate at 5ms-2 at the same instant the car passes it and continues for 8 seconds. It then stops

Yearly stock returns on India's Sensex Index are well described by a Normal model with a mean of 18.36% and a standard deviation of 14.65%. give the stock return cutoff for the middle 30% of all years. I used TI-83 Calc. for these. Can someone check them?

161. ## cis

You've decided to operate a day care home. Which one of the following factors is the most important in helping you make your decision

217. ## life orientation

what are the conditions of employment act applies the contravention?

218. ## physics

determine the magnitude of the centripetal force that acted on the whirling ball??

219. ## Physics

The system has two wheels and requires an effort of 12N to lift a load of 4kg at constant speed. Find M.A nd V.R.. Calculate work done by effort to raise load of 2m and efficiency of this machine.

220. ## Math

Ok, 1 football equals 13 ounces. 10 footballs would equal 130 ounces (right?). In order to find out how many pounds 10 footballs equal, would you divide 130 divided by 16?

221. ## physics

Gymnasts can do all sorts of ridiculous tricks on various equipment. In the rings event, the gymnast is supported by two rings attached by cords to the ceiling (see a picture here). If a gymnast weighs 75 kg and is motionless on the rings, what is the

222. ## Physical Science

How do you get the velocity of a roller coaster when you are only given 250.0kg and 2.000x10^4 Joules

223. ## Graphing Circles - Finding the radius

A circle is tangent to the y-axis at the point (0,2) and passes through the point (8,0). Find the radius of the circle. I tried using distance formula but it doesnt work? Help please thanks.

224. ## English

What is noun?

225. ## Physical Science

How do you calculate the number of grams of ice at 32 degrees celsius that can be melted by 1g of steam?

226. ## Calculus Derivative- Taylor Series?

let f(x)= x/x-1 find f'(x) f ''(x) and a formula for f ^ (n) * x. I found the first and second derivatives but do not know how to make a general equation for this. I have not learnt the Taylor or Maclaurin Series either. Thank you.

227. ## Trig

the height of a flagpole if a student stands 37 feet from it and determines the angle of elevation to be 34 degrees and her eyes are 5.3 feet from the ground.

228. ## stats

Suppose that 50 identical batteries are being tested. After 8 hours of continuous use, assume that a given battery is still operating with a probability of 0.70 and has failed with a probability of 0.30. What is the probability that fewer than 40 batteries

229. ## stats

The following data were obtained from a survey of college students. The variable X represents the number of non-assigned books read during the past six months. x 0 1 2 3 4 5 P (X=x) 0.20 0.25 0.20 0.15 0.10 0.10 Find P( X > 1)

230. ## Physics

Buffy the Vampire Slayer is buffing up her 0.53 meter long arms by bench pressing. In 35 seconds she can lift 38 kilograms of mass 23 times. How powerful are Buffy's arms?

231. ## stats

An ice cream vendor sells three flavors: chocolate, strawberry, and vanilla. Forty five percent of the sales are chocolate, while 30% are strawberry, with the rest vanilla flavored. Sales are by the cone or the cup. The percentages of cones sales for

232. ## stats

Mothers Against Drunk Driving (MADD) is a very visible group whose main focus is to educate the public about the harm caused by drunk drivers. A study was recently done that emphasized the problem we all face with drinking and driving. Five hundred

233. ## chem biochem bio

You have the following stock solutions and solid chemicals in your lab: 1.5M NaCL 0.2M Tris buffer, pH 8.0 10 mg/ml Bovine serum albumin (BSA) MgCl2 (solid, anhydrous) MW = 95.211 g/mole (95% pure) How would you make 250 ml of the following solution???

234. ## maths-circles

can we create a unique circle with two co-linear points

235. ## math

solve each equation 1) log5-log2x=1 2) 2log(x+1)=5

236. ## physical Science

The Mass Of A Minibus with The Driver is 1500 kg.the Driver Is Moving At A Speed Of 30 m.s When He Notices That The traffic light Ahead Have turned To red.he Applies A Force Of 9000N on the brake pedal. A)calculate his deceleration if the taxi is empty

237. ## chemistry help !!!!!!!!!!!!!!!!

a)A N6+ ion in its ground state absorbs an X-ray photon of energy 2.0000 keV. Explain what happens to the ion and why. b)Explain why the nitrogen ion N6+ is a hydrogen-like ion. Assuming the ion is for the major stable isotope 14N, state which sub-atomic

238. ## Math

Find a polynomial whose zeroes are double the zeroes of P(x)=x^3-7x^2-5x+2.

239. ## chemistry

a solution (S) is prepared by dissolving 50.0 g calcium chloride in 250 ml volumetric flask wich is then filled with distilled water up to the line mark. calculate the molar concentration of solution (S)

What are the core business activities of anglo american,nedcor and absa

241. ## political science

which political ideology would be against abortion, and why?

242. ## Quantum M.

Why "In Hilbert Space noone can hear you scream"?

243. ## eth 125 Wk 5

what the the economic, social and political standing of african americans in todays society

244. ## Physics

Suppose you wish to make a solenoid whose self-inductance is 1.6 mH. The inductor is to have a cross-sectional area of 1.3 x 10-3 m2 and a length of 0.065 m. How many turns of wire are needed?

245. ## science

There are four forces in nature. Name the four forces and rank them from strongest to weakest.

246. ## science

There are three particles inside an atom. One of them has zero electric charge. Which one is it?

247. ## physics

A wire that is 46 cm long is parallel to a 0.54 T uniform magnetic field. The current through the wire is 4.5 A. What force acts on the wire?

248. ## physics

A wire that is 630 m long is perpendicular to a 0.31 T magnetic field. A 1.8 N force acts on the wire. What current is in the wire?

249. ## physics

The force acting on a wire that is at right angles to a(n) 0.80 T magnetic field is 2.1 N. The current in the wire is 6.7 A. How long is the wire?

250. ## physics

A wire that is 0.45 m long and carrying a current of 9.5 A is at right angles to a 0.40 T magnetic field. How strong is the force that acts on the wire?

251. ## physics

A 36 cm long copper wire carries a current of 6.0 A and weighs 0.45 N. A certain magnetic field is strong enough to balance the force of gravity on the wire. What is the strength of the magnetic field?

252. ## MATH

There is a slide in the park that is 18 feet long. The ladder to the top of the slide is 7.5 feet long. If the ladder and the slide are perpendicular, what is "D", the distance from the top of the slide to the ground? Explain how you got your answer.

253. ## World Mythology

Discuss what the Egyptian stories of Isis, Osiris, and Horus reveal about Egyptian culture and what The Enuma elish reveals about Babylonian culture. How, in particular, do their stories reflect the beliefs of their respective peoples?

254. ## information technology help

give the weakness of microsoft power point with solution. 5 point

255. ## math

make up a set of 15 numbers with the following landmarks: maximum: 152 Range: 25 Mode: 139 Median: 142

256. ## Physics

How much work can a 252 W motor accomplish in 13 seconds?

257. ## LIFE ORIENTATION

INVESTIGATE AND EXPLAIN 3 ROLES AND 3 RESPONSIBILITIES OF MEDIA

258. ## maths

IN KINDERGARTEN HOMEWORK IT ASK TO LAY COUNTERS AND FEW NUMBERS ARE GIVEN LAY COUNTERS 5 _ 3 _ ETC WHAT DOES LAY COUNTER MEANS

259. ## physics

At what height above Earth's surface is the gravitational acceleration reduced from its sea-level value by 0.60%?

260. ## Physics

Suppose H⊗3|ϕ⟩=(1/2)√(|000⟩+|111⟩). What is |ϕ⟩? Specify the probability amplitude for each component:

261. ## aig math

Janet has 73 coins. Linda has 28 more coins then Janet, but 17 fewer coins than Alan. Sam has 33 fewer coins than Alan. How many more coins does same have than Janet? My answer is 12 coins, am i right? If not please tell me your answer and how you got it.

262. ## Math

A rectangular plot, 21m by 14m, is to be turned into a rectangular flower bed with a grass border around its outside edge. The grass border is to be 2m wide. What is the area of the flower bed? What is the area of the grass border?

263. ## chemistry

H2(g) + I2(g) *) 2HI(g) + heat Which response includes all the following that will shift the equilibrium to the left, and no others?