# Questions Asked onFebruary 5, 2011

1. ## STATISTICS

A statistics professor conducted a study on the effect of playing video games on a student’s test scores. On the first day of class, she randomly divided her classes into groups. Group one played video games 2 hours a day, group two played video games 4

2. ## Calculus

An electrical circuit switches instantaneously from a 2 volt battery to a 20 volt battery 3 seconds after being turned on. Sketch on a sheet of paper a graph the battery voltage against time. Then fill in the formulas below for the function represented by

3. ## Physics- Vectors

A bartender slides a beer mug at 1.4 m/s towards a customer at the end of a frictionless bar that is 1.8 m tall. The customer makes a grab for the mug and misses, and the mug sails off the end of the bar. (a) How far away from the end of the bar does the

4. ## Physics

A boy kicks a rock off a cliff with a speed of 19.4 m/s at an angle of 52.5° above the horizontal. The rock hits the ground 5.41 s after it was kicked. a) How high is the cliff? (I found the height to be 60.3 m) b) What is the speed of the rock right

5. ## Chemistry

How do I find the molarity of Fe(SCN)2+? I know the molarity of SCN=0.1 and the molarity of Fe is 0.0001. The volume of SCN is 5 mL and the volume of the Fe is also 5mL. I also think that I use M1V1=M2V2.

6. ## English 1

iM having a really hard time answering/understanding a question. this is the question. How is the conflict between Arthur and Frank a prelude to a larger conflict between Frank and the neighborhood? Write a paragraph speculating about what you think is the

7. ## MATH

You have $110 IN YOUR lunch account and plan to spend$2.75 each school day. a) Write and graph a linear equation that represents the balance in your lunch account (i just need help making an equation for this problem) b) How many school days will it take

I am just not sure about these questions. Any help is greatly appreciated. 1: Identify the sentence with correct subject-verb agreement. A: Although the trend is shifting, careers in science and technology continue to attract predominately men. B: Although

9. ## chem

The solvent for an organic reaction is prepared by mixing 50.0 of acetone () with 57.0 of ethyl acetate (). This mixture is stored at 25.0 . The vapor pressure and the densities for the two pure components at 25.0 are given in the following table. What is

10. ## PHYSICS

The weight of a hollow sphere is 100N.If it floats in water just fully submerged,what is the exterrnal diameter of the shere ?

11. ## Chemistry

Calcium carbide, CaC2, can be produced in an electric furnace by strongly heating calcium oxide (lime) with carbon. The unbalanced equation is CaO(s) + C(s) ¨ CaC2(s) + CO(g) Calcium carbide is useful because it reacts readily with water to form the

12. ## math

a rectangular parking lot has a length that is 10 yards greater than the width. the area of the parking lot is 200 square yards.find the length and the width

13. ## Physics

A vector has an x component of -23.0 units and a y component of 27.0 units. Find the magnitude and direction of the vector. ? units at ? counterclockwise from the +x-axis

14. ## math

Write then solve the inequality. 1. nine more than half the number n is no more than -8. Find n. 2. Judith drove h hours at a rate of 55 mi/hr. She did not reach her goal of driving 385 miles for a day. How long did she drive?

15. ## Physics

A child of mass 40.0 kg is swinging on a swing with ropes of length 4.0 m. How long does it take the child to swing from the maximum height on one side to the other?

16. ## physics

A 2.40 m length of wire is held in an east-west direction and moves horizontally to the north with a speed of 14.9 m/s. The vertical component of Earth's magnetic field in this region is 40.0 µT directed downward. Calculate the induced emf between the

17. ## physics

All but two gaps within a set of venetian blinds have been blocked off to create a double-slit system. These gaps are separated by a distance of 3.1 cm. Infrared radiation is then passed through the two gaps in the blinds. The angle between the central and

18. ## Statistics

How many ways can Aileen choose 5 pizza toppings from a mean of 19 toppings if can only be chosen once?

19. ## chemistry

An electron in the n = 5 excited state of a hydrogen atom emits a photon of 1281 nm light. To what energy level does the electron move? Any ideas on an equation for this? Is it some kind of backward version of Rydburg Eq?

20. ## chemisty

A mixture contains only NaCl and Al2(SO4)3. A 1.76-g sample of the mixture is dissolved in water, and an excess of NaOH is added, producing a precipitate of Al(OH)3. The precipitate is filtered, dried, and weighed. The mass of the precipitate is 0.126 g.

21. ## chemistry

Consider a red flame color produced by excited lithium with a wavelength of 671 nm. What is the mass equivalent of 1 mol of photons of this wavelength? I can get as far as Js of E Can't seem to find equation to turn Js into mols, or photons into mols, for

22. ## physics

A charge of -8.9 µC is traveling at a speed of 7.8 106 m/s in a region of space where there is a magnetic field. The angle between the velocity of the charge and the field is 60°. A force of magnitude 4.0 10-3 N acts on the charge. What is the magnitude

23. ## College Chemistry2

A solutionof 2.50g of a compound having the empirical formula C7H6O2 in 25.0g of benzene is observed to freeze at 4.3 degree C.Calculate the molar mass of the solute and its Molecular formula

24. ## Physics

A spy satellite is in circular orbit around Earth. It makes one revolution in 5.95 hours. (Radius of the Earth=6.371 106 m) (a) How high above Earth's surface is the satellite? (b) What is the satellite's acceleration?

25. ## physics

what sould be the angular speed with which the earth have to rotate on its axis so that a person on the equator would weight 3/5th as much as present..??

26. ## Math

A number when divided by 14 or 13 leaves a remainder 3. Find the least possible value of that number?

42. ## geometry

if 32 degrees is less than three times its supplement, how large is the angle?

110. ## Science(chemistry)

What is Kc at its temperature?

111. ## SUNO

COMPARE AND CONTRAST A SUBPOENA, A SUBPOENA AS TESTIFICANDUM, AND SUBPOENA DUES TECUM.

112. ## Physics

Pa and Oz start walking at the same corner of a field whose south- west is bounded by a straight wall. Pa walks alongside the wall at 5.5 km/h while Oz sets off at 6 km/h along a straight foot path across the field which makes an angle of 50 degrees with

113. ## Science

How could I estimate how long osmosis takes to occur in a potato? Will it depend on the salinity of the solution it is submerged in? Were I to make a prediction on how long it would take for osmosis would occur in my lab, how could I scientifically prove

114. ## Random Question

In the movie "Hauting Sarah" what is the twin sister trying to accomplish??? bringing her son back through her sister?

115. ## Statistic

Case 6.4 Maternal Serum Screening Test for Down syndrome Please keep in mind that I do not have a Math back ground so this is brand new to me and like a foreign language that I have never seen nor heard spoken before. Thank you for your help in advance.

116. ## Math

Find the derivative of f(x)= 2 sqrt x at x=4. i thought that the derivative would be 2 x^1/2 but I guess this is wrong.

117. ## religion

WHat are the similarities in religion in the new england and middle colonies ? Also the differences in religion in the new england and middle colonies?

What is the difference between the actual increase in profit as production increases from 5 to 6 units, and the marginal profit at a production level of 5 units where the profit function is given by p(x)= 3x^2 - 5x + 2 First I plugged 5 into the equation

119. ## insurance form preparation

What form should be attached to a CMS-1500 form submitted to a secondary insurance company? A. a copy of the CMS-1500 sent to the primary insurance company. B. An Explanation of Benefits (EOB) C. a copy of the patient's medical treatment record. D. a copy

120. ## American history

What were the causes of shays rebellion and how did it lead to the constitutional convention? Thanks!!!!

121. ## Physics 3

A particle of mass m = 0.35 kg is oscillating on the end of a spring with amplitude 0.32 m. It is at its equilibrium position (x=0), moving in the positive x-direction, at t=0, and 0.18 s later it is at x=0.25 m. a. What is the lowest possible value for

122. ## math

Find the appropriate cost function in each case: Fixed cost, $200; 50 items cost$2000 to produce. help me please! ty!!

123. ## Math 156

If a figure has two right angles, then it is a rectangle? I said that the figure is in not a rectangle if it has two right angles, because a rectangle has four right sides.

124. ## math

Circle J has a radius of 6 in. JK and JL form an angle that is not a straight angle. The lenght of KL is not 6 in. Classify ^JKL accordingly to its sides.

125. ## testing of materials

How do I solve these two problems ? 1.The mass of a quantity of is 32.7 g. What is it's volume in cm raised to the third power ? 2.The volume of a quantity of water is 0.42 cm raised to the third power. Find its mass in g.

126. ## math

using 3,4,5,6, =28 you have to use each number once Using addition once, subtraction once, multiply once and divid once how do get these numbers to =28 please shoe me how you do it Thanks

127. ## Algebra

Solve the equation w=Cr^-2 for r. Is this right? w/C=r^-2 r=sqrt(C/w) And if so, I still seem to be having troubles answering the next part. 2. Suppose that an object is 100 pounds when it is at sea level. Find the value of C that makes the equation true.

128. ## math

calculate the monthly payment by loan amotization table: loan 26,000, down payment of 5,000 at 11% for 36 months

130. ## Algebra

Divide: (-8y^7x+15y^7x^6)/(-2y^2x^5) I got y^5(-8+15x^5)/-2x^4 It won't let me add parens. in the answer any suggestions. It does say simplify your answer as much as possible.

131. ## Algebra

Solve the equation w=Cr^-2 for r. This is what I got so far.... w/C=r^-2 Then I think it's... ok so I don't really know. I want to put w/C=1/r^2 but the r is still not alone and I'm not sure where I'd take it from there. Please help.

132. ## English

On a works cited page for a book with 7 different authors.... do you use and between the 6th and 7th author....or just list? Thanks

133. ## physics

A car is climbing a hill and accelerating at a constant rate of 0.3 g as it does so. Φ=10°. What is the steady state value of θ, the angle made by a mass hung from a cord that’s attached to the rearview mirror. ?

134. ## enviromental science

I need to find a climatogram of Puerto Rico for my project. I've gone on several different sites for puerto rico and several environmental sites but have not been able to find a climatogram for puerto rico's tropical rainforest, does anyone know of a site

135. ## Calculus

integrate t*(t^2 - 1)^(1/3) dt over (0,3) I substitute u = t^2 - 1 du = 2t dt which leads to integrate (1/2) u^(1/3) du over(-1,8) = (3/8) * u^(4/3) over (-1/8) = 3/8 * [8^(4/3) - (-1)^(4/3)] I would guess that (-1)^(4/3) is +1, since the cube root of -1

136. ## physics

A body pulled by a constant force accelerates from 10 cm/s to 35 cm/s in 3.5 s. A second force accelerates the same body from rest to 110 cm/s in 10.5 s. If the first force is known to be 5.0 N, that what is the second force?

137. ## economics

Nair Inc. bought a "growing perpetuity" bond. The bond will pay 631.85 dollars at the end of year 1 and the payment will increase by 2.5 percent each year forever thereafter. Assuming the interest rate is 11.26% (forever), what is the maximum amount that

138. ## soil science

True or False: for a particular soil, pressure just under the water table is negative

WHAT ARE the pros and cons of the following statement: “Egalitarian companies are more innovative.”

140. ## Algebra B

I am confused as to what the nth power is. Is it any number as an exponent that leaves the radicand the same? Could you please show me an example? thanks,

141. ## math

Which of the fllowing dimensions describes te right triangle with an area of 36cm^2 having the greatest perimeter?

142. ## socialstudy

state and discued the role of farmily in AFRICAN setting

143. ## Math

The reduced row echelon form of the matrix -1/2 1/2 3/2 -3/2 2 3/2 1/2 -3/2 9/2 is?

144. ## ma

The only value of b for which the following system of equations in(s,u,z)does not have a unique solution is: b = 3⁢s+3⁢u-z=3 -3⁢s+3⁢u=-3 -3⁢s+b⁢u-z=-3

(-5x^2)2

146. ## New Age Math

Given the initial augmented matrix -1 1 2 0 2 -1 -3 0 2 -2 -4 0 find the RREF

147. ## Math

The point (-4.3) lies on a circle whose center is at (2,1). Find an equation of this circle.

148. ## English HS

I have to write a paper on my ethical and moral values. I don't know where to begin! I know I should look at my parents and upbringing but I feel I was ingrained and I don't know how to explain that! any tips are great. Thank you guys

b^9 b^3

r^2+11r+30=0

151. ## science

can a bicycle have the same acceleration?how?

152. ## english

What can i say at the start and at the end of a recorded interview? i will be interviewing an agriculturist.

153. ## Algebra

Find the slope of points (-2,2) and (2,1)

154. ## intermediate algebra

Multiply (2sqrt5 -1)(2sqrt10 -3)

155. ## Abstract Algebra

Let f:A->B where A and B are nonempty. Prove that f(S1 U S2) = f(S1) U f(S2)

156. ## Math

4+(-7)+2(-5)= i think the answer is -6

157. ## social studies/ history

name famous civil war battles fought in missouri and who won???

158. ## math

144+(-317)+213 i think the answer is 40

a^6-729

160. ## math

I4+(-3)I+I-2I i think the answer is 3

161. ## math

I4+(-3)I+I-2I i think the answer is 3

162. ## Algebra

have no idea how to do this... divide and write your answer WITHOUT exponents. -11.2 x 10^-7 _______________ = 1.6 x 10^-2

163. ## math

what integer makes the equation -13 + 12 + 7 +?+10 i think it is 4

164. ## groundwater science

Consider water in a well, and a point of measurement at depth below the surface of the water. True or False: if the point of measurement is located at an elevation of 2,000 ft. above mean sea level, and that point of measurement is 40 ft. below the water

165. ## writing

so i have to write a research paper(3-4 pages) on this topic 'does lack of sleep affect heart rate' how do i do that...this is the first time i write a research paper so i need help..thanks

166. ## Physics

A Jet has a liftoff speed of 160 km/hr. What minimum uniform acceleration does this require if the aircraft is to be airborne after a takeoff run of 300m?

167. ## human resources

Help please. I need to find information on how peers influence a sweet 16 party for a female. I can find information on how the media influences this, but I need solid information on how peers can influence a sweet 16 party. I am doing the rites of passage

168. ## calculus

find the area of the region R that lies under y=√x (x+1), over 0≤x≤4

169. ## College Math

Given the initial augmented matrix 1 -1 0 2 3 -2 -2 3 -2 2 1 -3 RREF?

170. ## network utiliztion

A network has a capacity of 90,000 frames per minute and the input to the network is 900 frames per second. If .05% of all transmitted frames are lost and must be repeated, what is the network utilization?

171. ## chemistry

1.when the concentraion of acetone was doubled, the time was about _____ the original time and the rate was about _______ the original rate. 2.when the concentraion of H+ was doubled, the time was about _____ the original time and the rate was about

172. ## us history

What were three problems under the articles of confederation, and what were two successes?

173. ## American history

When was the new York state constitution written and what are the two parts of the new York state legislature?

174. ## Internet - IT

Hi, Can some confirm that both the TCP/IP and OSI model are both examples reference models. I feel that both are reference models. And lastly is it right that, DHCP is a protocol that enables network devices to share a pool of IP addresses. and is a

175. ## history-paul klee

what contributions did paul klee make in the 1920's?

176. ## Science

When u kick a stone your foot exerts force on the stone and the stone exerts a force ? in size and ? in direction on your foot

177. ## MATH

(3s+2d)(3s-2d) 9s^2-6ds+6ds-4d^2 9s^2-4d^2+0ds

178. ## English

Edit for proper grammar Neither of the textbooks contain the answer to the test question.

179. ## American history

When was the new York state constitution written and what are the two parts of the new York state legislators?

180. ## chemistry

what is a good experiment for investigating the influence of the size reaction-surface on the reaction tempo of a specific raection. using Cal-c vita tablets, rennies tablets and vinegar...?

181. ## word problem

a computer company gives a discount of 10% on a new piece of software.If it makes a 40% profit what percentage does the marked price exceed the cost price

182. ## Math

How do you find the length of one side of a trapeziod using the 'point-to-a-line distance' formula?

183. ## Math

How do you show that 2 sides of a trapezoid are parallel?

30>-6(5-x)

30¡Ý-6(5-x)

186. ## ENGLISH HS

What can i say at the start and at the end of a recorded interview? i will be interviewing an agriculturist.

187. ## Physics

Find the speed of a pendulum bob at the bottom of its swing if its initial displacement is 5 degrees and its period is 2 s.

188. ## algebra

54r^14 -3r^7 find quotient

189. ## algebra

u-^8 positive exponent

190. ## algebra

Subtract (1.5x^3+4.8x^2-3.7x)(-4.3x^3-4.5x^2+32)

191. ## chemistry

what would happen if you mixed isopropanol with copper

192. ## VHS

a triangle has sides with lengths of 11 meters, 9 meters, and 7 meters. what type of triangle is it?

193. ## chemistry

hen 9.3 g of an unknown non-electrolyte is dissolved in 50.0 g of benzene, the boiling point the boiling point increased to 81.19 degrees C from 80.1 degrees C. If the Kbp of the solvent is 2.53 K/m, calculate the molar mass of the unknown solute. The