# Questions Asked onFebruary 17, 2013

1. ## science

A tire 0.500 m in radius rotates at a constant rate of 200 rev/min. Find the speed and acceleration of a small stone lodged in the tread of the tire ( on its outer edge ).

2. ## DYNAMICS

A car has an initial speed of 25m/s and a constant deceleration of 3m/s^2. Determine thewvelocity of the car when t=4s. What is the displacement of the car during the 4-s time interval? How much time is needed to stop the car?

3. ## Physics

A science student is riding on a flatcar of a train travelling along a straight horizontal track at a constant speed of 10.0 m/s.The student throws a ball into the air along a path that he judges to make an initial angle of 60.0 degrees with the horizontal

4. ## maths-urgently needed

Integrate ( x^2cosx)/(1+sinx)^2 dx with limits from 0 to pi/4

5. ## maths

1) A chemistry teacher requires 250 milligrams of a chemical for an experiment. He has 30 grams of the chemical. How many times can he carry out the experiment? 2) A bottle contains 1.5 litres of cola. Hannah drinks 300 ml of the cola and Ben drinks 450

6. ## PHY

. Four identical metal spheres have charges of qA = –8.0 µC, qB =–2.0 µC, qC = +5.0µ C, and qD = +12.0µ C. (a) Two of the spheres are brought together so they touch, and then they are separated. Which spheres are they, if the final charge on each

7. ## Trig

Verify the identity. cos 4x + cos 2x = 2 - 2 sin^2(2x) - 2 sin^2 x

8. ## DYNAMICS

A particle travels along a straight line with a velocity v=(12-3t^2) m/s, when t is in seconds. When t=1s, the particle is located 10m to the left of the origin. Determine the accelaration when t=4s, the displacement from t=0 to t=10s, and the distance the

9. ## biology

People with a lactose intolerance are able to take products such as Lactaid that contain the lactase enzyme with their meals. These products can be taken in pill form. Considering the fact that the pill form of the enzyme would have to travel through the

10. ## Statistics

The life spans of three randomly selected tires are 31,950 miles, 36,050 miles, 34,000 miles. Using the empirical rule, find the percentile that corresponds to each life span.

11. ## Trigonometry

Verify the identity algebraically. TAN X + COT Y/TAN X COT Y= TAN Y + COT X

12. ## Science(applied physics)

At time t=0,a 1kg ball is thrown up from the top of a tall tower with velocity Vo=18i+24j(m/s). a:calculate the components of th velocity at t=6s. b:Calculate the kinetic energy of the ball at t=6s.

13. ## poetry

Read the following poem and answer questions that follow: Life, death,-death, life; the words have lead for ages Our thought and consciousness and firmly seemed Two opposites; but now long-hidden pages Are opened, liberating truths undreamed' Life only is,

14. ## chenistry

25ml of a solution of na2c03 having a sepcific gravity of 1.25g solution of hcl containing 109.5g of the acid per litre for complete neutralization. Calculate the volume of 0.84N h2s04 that will be compltetly neutralized by 125g of na2c03 solution. In

15. ## Physics

What is the gravitational force between two 5.00 kg masses that are 10.0 cm apart from center to center? (G = 6.67 × 10-11 N m2/kg2)

16. ## Trigonometry

State the quadrant in which θ lies. 1.) CSC θ is greater than 0 and TAN θ is less than 0. 2.) SEC θ is greater than 0 and SIN θ is less than 0.

17. ## math

during a triathlon, Sharon swims 1/4 of the total route and cycles 3/5 of the remaining route. she runs the rest of the route. if she runs 3,600 meters, find the total distance of the triathlon route. show your work.

18. ## Chemistry

Lauryl alcohol is obtained from coconut oil and is used to make detergents. A solution of 5.00 g of lauryl alcohol in 100.0 g of benzene freezes at 4.2 oC. What is the approximate molar mass of lauryl alcohol. Refer to the text book for the boiling point

19. ## Physics

A bicycle wheel of radius 0.30 m is spinning at a rate of 60 revolutions per minute. What is the centripetal acceleration of a point that is 0.11 m from the outer edge of the wheel?

20. ## Math Statistics

The life span of three randomly selected tires are 34,700 miles, 43,000 miles, 39,000 miles. Using the empirical rule, find the percentile that corresponds to each life span.

21. ## Trig

Three circles with radii of 4, 5, and 6 cm, respectively, are tangent to each other externally. Find the angles of the triangle whose vertexes are the centers of the circles.

28. ## Science

The vapor pressure of water at 25 oC is 23.8 torr. Calculate the vapor pressure of a solution prepared by dissolving 35.0 g of urea [(NH2)2CO] in 75.0 g of water at 25 oC.

29. ## physics

In open heart surgery a much smaller amount of energy will defibrillate the heart. (a) What voltage is applied to the 5.00 µF capacitor of a heart defibrillator that stores 35.0 J of energy? kV (b) Find the amount of stored charge. mC

30. ## finance

Assume investors expect a 2.0 percent real rate of return over the next year. If inflation is expected to be 0.5 percent, what is the expected nominal interest rate for a one-year U.S. Treasury security?

31. ## math

Y varies direct proportion with x.if x=5 then y=12,thus find the value of y when x=7.5

32. ## Spanish

Answer the following question in Spanish..que pides muchas veces como Plato principal

33. ## Probability & Statistics

32% of women consider themselves fans of professional baseball. You randomly select six women and ask each if she considers herself a fan of professional baseball.

34. ## chem

H2S(aq) + NiSO4(aq) →

60. ## Chemistry

Currently studying for an lab exam. Just have a few question about a typical Iodine Clock reaction lab. In an typical Iodine Clock reaction lab what would be the state of effect of an increase in the initial concentration of persulfate ion and the increase

61. ## US History

Under Andrew Jackson's presidency who got the most power and from whom?

62. ## pre cal

If (a, b) is a point on the unit circle that corresponds to the angle t, then tan(t) equals:

63. ## science

How do I make an acrostic that has to do with the word Wavelength?

64. ## Algebra

A cone has a radius of 15 cm and a volume of 540 cm3. Find the volume of a similar cone with a radius of 10 cm. A. 54 cm^3 B. 240 cm^3 C. 16 cm^3 D. 360 cm^3 I think its D but by the process of elimination...don't know how to figure it out really...?

65. ## Chemistry

A 62g piece of ice at 0 degrees celcius is added to a sample of water at 9 degrees celcius. All of the ice melts and the temperature of the water decreases to 0 degrees celcius. How many grams of water were in the sample

66. ## world history

What are some changes and continuities in the demography of North America from 600-1750?

67. ## science

A ski jumper launches from a ski jump that is oriented parallel to a hill. The jump has a vertical drop of 50 m and the coefficient of friction μ between the skier and the jump is 0.05. The launch point is 5 m above the hill and there is a small lip at

68. ## Chemistry

At equilibrium, the concentrations in this system were found to be [N2]=[O2]=0.100 M and [NO]=0.400 M. N2 (g) + O2 (g) --> 2NO (g) If more NO is added, bringing its concentration to 0.700 M, what will the final concentration of NO be after equilibrium is

69. ## Life orientation

Describe the life/behaviour and explain 5 factors that contribute to hiv/aids

70. ## english

Please i need help... is this article biased or not biased and why? thank you very much:) OTTAWA — Nearly 15 years after a senior Mountie warned the RCMP it needed to tackle pervasive workplace harassment, the national police force must show it takes the

71. ## Chemistry

Given a very concentrated glycercol solution. Dilute it to 7.5 fold dilution. How do I do this ?

72. ## Math

Define the function f(x)=2x/1−x^2. Find the number of distinct real solutions of the equation f^(5)(x)=x. Details and assumptions f^(n)(x) denotes the function f applied n times. In particular, f^(5)(x)=f(f(f(f(f(x))))).

73. ## Linear Algebra

A company separates iron, zinc, and kryptonite from ore by the floatation separation process, which has three steps: oiling, mixing, and separation. These steps must be applied for 4, 5, and 1 hour respectively to produce one unit of iron; 4, 4, and 1 hour

74. ## Trigonometry

Verify the identities. 1.) √1-COSθ/1+COSθ= 1+SINθ/SINθ 2.) SEC X SIN(π/2-X)= 1 3.) CSC X(CSC X-SIN X)+SIN X-COS X/SIN X + COT X= CSC²X 4.) CSC^4 X-2 CSC²X+1= COT^4 X 5.) CSC^4 θ-COT^4 θ= 2 CSC²θ-1 6.) TAN^5 X= TAN³X SEC²X-TAN³X 7.) COS³X

142. ## Physics

Calculate the net charge on a substance consisting of a combination of 7.5 multiplied by 1013 protons and 3.5 multiplied by 1013 electrons. Answer in units of C

143. ## Ellison

Divers know that the pressure exerted by the water increases about 100 kPa with every 10.2 m of depth. This means that at 10.2 m below the surface, the pressure is 201 kPa; at 20.4 m below the surface, the pressure is 301 kPa; and so forth. If the volume

144. ## Geography

Can someone tell me what this question means: Which of these rivers flows entirely within the Northern Hemisphere? Amazon - Parana - Uruguay - Orinoco - Negro. I don't get the question. Thanks

145. ## Chemistry

I'm trying to write a sentence like this: Exothermic reactions have a negative enthalpy change value because the enthalpy of the reactants are greater than the enthalpy of the products since the reactants have weaker bonds.... Why do weaker bonds have

146. ## english

Please i need help... is this article biased or not biased and why? thank you very much:)i am very confused.. OTTAWA — Nearly 15 years after a senior Mountie warned the RCMP it needed to tackle pervasive workplace harassment, the national police force

from the perspective on the black passenger what possible beginning hooks (or sentence that would make people want to read the essay) and possible endings. idk what to write please help

148. ## maths

a hiker walk due east at 4km per hour and a second hiker starting from the same point walks 55 degree north-east at the rate of 6km per hour. H ow far apart will they be after 2 hours. this is my ques but .i am having problem that if the hiker walks 55

149. ## Statistics

the perspective on rosa parks, the bus driver, or another passenger (black,or white} i have to write a beginning hook also known as a sentence that makes people want to read it. i choose the black passenger so i need help on creating a sentence and a

151. ## chemistry

A helium-ﬁlled balloon contains 143 mL of gas at a pressure of 0.99 atm. What volume will the gas occupy at standard pressure?

152. ## biology

30. Enzymes function most efficiently at the temperature of a typical cell, which is 37 degrees Celsius. Increases or decreases in temperature can significantly lower the reaction rate. What does this suggest about the importance of temperature-regulating

153. ## physics

A 21.0-g metal cylinder is placed on a turntable, with its center 85 cm from the turntable's center. The coefficient of static friction between the cylinder and the turntable's surface is ìs = 0.83. A thin, massless string of length 85 cm connects the

154. ## Computers

Name three problems that can arise when data becomes mixed up.

155. ## english

What is the error in the sentence? Try and find a suitable replacement for the discontinued model.

156. ## math

solve the simultaneous equations; log x base 2-log y base 4=4, log (x-2y)base 2=5

157. ## ALGEBRA 2

the airline cost for x thousand passengers to travel round trip from nyc to atlanta is given by C(x)= radical 0.3x+1 where C(x) is measured in millions of dollars and x> 0. find the airline's cost for 15,000 passengers (x=15) to travel from new york to

158. ## algebra

Read the article about Body Mass Index (BMI) on page 151 of Elementary and Intermediate Algebra. Use the formula given using pounds and inches for finding the BMI at the end of the first paragraph in order to find the four intervals the article mentions:

159. ## CRT205

Option 1: Article Review Choose one newspaper editorial and one magazine article from the lists provided by your instructor and write a 250- to 350-word response to the following: • What rhetorical devices are found in each article? • Based on their

160. ## french

est qui si la balla tu qu ci du basket ball.du imagrtion la fanes

161. ## Math

Which property of the real number is illustrated by the following (17*7)*12=17*(7*12

162. ## College Algebra

Suppose that the length of a rectangle is 21 inches and the width is 4 more than one third of the length?

163. ## ALGEBRA 2

the airline cost for x thousand passengers to travel round trip from nyc to atlanta is given by C(x)= radical 0.3x+1 where C(x) is measured in millions of dollars and x> 0. find the airline's cost for 15,000 passengers (x=15) to travel from new york to

the perspective on rosa parks, the bus driver, or another passenger (black,or white} i have to write a sentnce that would ,make the people want to read it. and a possible ending

165. ## ALGEBRA

use the pythagorean theorem to find b when a=14 and c=y (triangle) b=

166. ## english

Please i need help... is this article biased or not biased and why? thank you very much:)i am very confused.. I KNOW WHAT BIASED IS AND NON BIASED.. BUT I JSUT DON'T KNOW WHICH ONE THE ARTICLE IS..! OTTAWA — Nearly 15 years after a senior Mountie warned

167. ## college chemistry

Assuming that 9.0\% of the energy output of a 65W lightbulb is visible light and that the average wavelength of the light is 550 {\rm nm}, how many photons are emitted by the lightbulb each second?

A chunk of oak firewood has a mass of about 2.85 kg and has a volume of 4100 cm^3. Determine the density of oak in g/cm^3.

169. ## Physics

The Royal Gorge bridge over the Arkansas River is 310.0 m above the river. A 59.0-kg bungee jumper has an elastic cord with an unstressed length of 62.0 m attached to her feet. Assume that, like an ideal spring, the cord is massless and provides a linear

170. ## trig

cos^(2) 20 degrees + sin^(2) 20 degrees +pi/2

171. ## Sociology

philosophers suggest arguments should be won by? a. the best argument b. a coin flip c.the person who feels most strongly about the issue d. vilence

172. ## Computer Literacy

HOw has the definition of computer literacy changed over time? I don't know any thing about computers

173. ## phy

. Show that 480 W of power is expended by a weightlifter when lifting a 60-kg barbell a vertical distance of 1.2 m in a time interval of 1.5 s.

174. ## English 225

Which of the following editing techniques helps keep screen direction constant?

175. ## math problem

1/3, 3/5,5/7,7/9,9/11,....If the pattern continues ,what is the 100th fraction in the sequence?

176. ## Algebra

invest $3000 and save$100 each month. Write a rule to represent the total amount of money invest into your account as arithmetic sequence. How much money will you have invested after 12 month?

177. ## chemistry

25ml of a solution of na2c03 having a specific gravity of 1.25g ml required 32.9ml of a solution of hcl containing 109.5g of the acid per litre for complete neutralization. Calculate the volume of 0.84N heso4 that will be compltetly neutralized by 125g of