# Questions Asked onFebruary 9, 2013

1. ## physics

three point charges of 3µC, 8µC and -5µC are located at the corners of an equilateral triangle. calculate the net force on the 8µC

2. ## Chemistry

A 0.100 mol sample of H2S is placed in a 10.0 L reaction vessel and heated to 1132°C. At equilibrium, 0.0285 mol H2 is present. What is the value of Kc at this temp? 2 H2S(g) 2 H2(g) + S2(g After I do my calculations, I get Kc= (0.0057)2 X

3. ## ap chemistry

What pressure would a mixture of 3.2 grams of O2, 6.4 grams CH4, and 6.4 grams of SO2 exert if the gases were placed in a 5.1 liter container at 127C? Answer in units of atm

4. ## Math

Rearrange this equation to isolate c. a=b((1/c)-(1-d))

5. ## biochem

I'm stuck on this question, not sure where to start. can you show detail and explain so that it helps me to understand it. help please, thanks. The value of delta G for the conversion of 3-phosphoglycerate to 2-phosphoglycerate (2PG) is +4.4kj/mol. If the

6. ## science

A boy and his skateboard have a combined mass of 64 kg. If he is moving with a speed of 3.2 m/s, and collides with a stationary skateboarder whose mass (including his skateboard) is 96 kg, with what speed will the two skateboarders move immediately after

7. ## ap chemistry

A 115 mg sample of eugenol, the compound responsible for the odor of cloves, was placed in an evacuated flask with a volume of 500 mL at 280C. After the eugenol completely evap- orated, the pressure that it exerted in the flask under those conditions was

8. ## ap chemistry

A 6.9 gram sample of a gaseous substance occupies 10 L at 63C and 537 torr. What is the density of the gas under these conditions? Answer in units of g/L

9. ## Science

what power is expended by a weightlifter when lifting a 60kg barbell a vertical distance of 1.1m in a time interval of 2.0s

10. ## ap chemistry

An oxygen sample has a volume of 5 L at 27C and 800 torr. How many oxygen molecules does it contain?

11. ## ap chemistry

A 1.50 liter tank filled with helium at 125 atm is used to fill balloons. The pressure in each balloon is 950 torr and the volume of each balloon is 1.20 liters. How many balloons can be filled? Answer in units of balloons

12. ## statistics

A local country club has a membership of 600 and operates facilities that include an 18-hole championship golf course and 12 tennis courts. Before deciding whether to accept new members, the club president would like to know how many members regularly use

13. ## phy

a watermelon seed has the following coordinates: x= -5.0, y = 8.0m, and z = 0m. find its position vector (a) in unit-vector notation and as (b) a magnitude and (c) an angle relative to the positive direction of the x axis (d) sketch the vector on the

14. ## math

Find the area of a parallelogram: base 5.2 cm, height 2.3 cm. 10.6 cm² 12.96 cm² 5.98 cm² 11.96 cm² I think its the last option is that right?

15. ## statistics

a towns snowfall in december averages 13 inches with a standard diviation of 8 inches while in february the average snowfall is 40 inches with a standard deviation of 13 in which month is it more likey to snow 32 inches. explain

16. ## Physics

A downward force of 5.1 N is exerted on a -7.3 mcirco C charge. What is the magnitude of the electric field at this point?

17. ## ap chemistry

An apparatus consists of a 2 L flask containing nitrogen gas at 25C and 819 kPa, joined by a valve to a 12 L flask containing argon gas at 25C and 51 kPa. The valve is opened and the gases mix. What is the partial pressure of nitrogen after mixing?

18. ## physics

a ball roles off a horizontal table at 0.30 m/s and strikes the ground 0.15m horizontally from the base of the table. (a) how high is the table (b) if another ball roles off the same table at 0.60 m/s how far from the base of the table does it hit.

19. ## chemistry

Suppose a compound Z had a partition coefficient of 8.0 in ether-water. If 10.0 g of Z was dissolved in 100 mL of water, and if the water solution was extracted with two 100 mL portions of ether, answer the following questions. show your calculation. a)

20. ## math

Find the area of a triangle: base 14 cm, height 5.5 cm. 19.5 cm² 77 cm² 38.5 cm² 770 cm² i think its either 38.5 or 77

21. ## maths-urgently needed

A moneylender 's income decreased by Rs.60 when the rate of interest dropped from 8%p.a to 31/4%p.a.What was his principal

22. ## Physics

A child operating a radio-controlled model car on a dock accidentally steers it off the edge. The car's displacement 0.95 s after leaving the dock has a magnitude of 6.7 m. What is the car's speed at the instant it drives off the edge of the dock?

23. ## Algebra

Solve equation for y: 6y-3x=12 and then what will be the answer (-2) for x to graph a function form

24. ## ap chemistry

Nitroglycerin is a shock-sensitive liquid that detonates by the reaction 4C3H5(NO3)3() −! 6N2(g) + 10H2O(g) + 12CO2(g) + O2(g) Calculate the total volume of product gases at 210 kPa and 296C from the detonation of 2.7 lb (1224.7 g) of nitroglycerin.

25. ## math

divide 1.702 by .06 gave answer correct to two decimal places.

26. ## maths

a rectangular plot of grass 25m by 22m has a gravel walk 1.5m wide all around it on the outside.What is the area of the gravel walk?

27. ## CHEMISTRY

How to calculate the pH of 0.120 M of HClO2? plssss i need the answer asap.

28. ## math

solve for x 75=13^x

29. ## Europe

Which of the following is the greatest concern for Eastern Europe? water pollution water availability desertification overpopulation

30. ## Pure Mathematics

1. Given that the straight line y=c-3x does not intersect the curve xy=3, find the range of values for c. 2. Find the range of values for c for which the line y=cx+6 does not meet the curve 2x^2-xy=3. 3. Find the range of values for k for which 8y=x+2k is

31. ## Chemistry

On a 10.5 ounce bag of potato chips, the manufacturer states that the single serving is one ounce, which is equivalent to 150 calories. How many kilojoules are in this bag of potato chips? Is it 6.5898kJ?

32. ## maths

on selling a bag for rs.704, a shopkeeper suffers a loss of 12% at what price should he sell it to gain 7.5%

33. ## ap chemistry

Jeff and Jill go canoeing. While reaching to feed a duck, the boat flips. Jeff and Jill blow up their inflatable life preservers and then put them on. As they wait for the rescue squad, they calculate how much nitrogen is in each life preserver. They

56. ## lindy

how many different flags can be made? if there are 5 colors,but the flag must have 3 bands of color

57. ## Math

The sixth term of an arithmetic progression is 265 and the sum of the first 5 terms is 1445. Find the minimum value of n so that the sum of the first n terms is negative.

58. ## Chemistry

A horizontal force is applied to a 2-kg ball on a smooth table. The ball's speed is 6 m/s when it has gone 3 m. The magnitude of the force is

59. ## Chemistry

A student mixes 85.1 g of water at 69.6°C with 58.1 g of water at 22.0°C in an insulated flask. What is the final temperature of the combined water?

60. ## math

mark makes easter eggs.each egg contains 6 toffees,the toffees being selected from 3 different sorts.how many different selections are possible if each egg must contain at least one toffee of each sort?

61. ## ETSU

How much work is done when a force of 800.0 N is exerted while pushing a crate across a level floor for a distance of 1.5 m

62. ## Modern Physics

A point charge \left( {m = 1.0\,{\rm{g}}} \right) at the end of an insulating cord of length 55 {\rm cm} is observed to be in equilibrium in a uniform horizontal electric field of 15,000\,{\rm{N/C}}, when the pendulum's position, with the charge 12 {\rm

63. ## science

Calculate the fraction of atoms in a sample of argon gas at 365 K that has an energy of 11.0 kJ or greater.

64. ## ap chemistry

To what temperature must a sample of helium gas be cooled from 123C to reduce its volume from 3.7 L to 0.27 L at constant pressure? Answer in units of K

65. ## Chemistry

The main reason for the increase in reaction rate with temperature is that: The activation energy increases rapidly with temp (I think it is this one) A 10 C temp rise results in the rate doubling heats acts as a catalyst or The fraction of high-energy

66. ## physics

a ball roles off a horizontal table at 0.30 m/s and strikes the ground 0.15m horizontally from the base of the table. (a) how high is the table (b) if another ball roles off the same table at 0.60 m/s how far from the base of the table does it hit.

67. ## physics- vertical circular motion

For the normal force in the drawing to have the same magnitude at all points on the vertical track, the stunt driver must adjust the speed to be different at different points. Suppose, for example, that the track has a radius of 2.06 m and that the driver

68. ## physics

a soccer player takes a penalty kick 11.0m from the goal. to score she has to shoot the ball under the 2.44m high crossbar. if she kicks at 19.8m/s, what range of launch angles will result in a goal?

69. ## algebra

An airplane over the Pacific Ocean sights an atoll at an 7° angle of depression. If the plane is 663 m above the water, how many kilometers is it from a point 663 m directly above the atoll?

83. ## Chemistry

Biphenyl, C12H10, is a nonvolatile, non ionizing solute that is soluble in benzene, C6H6. At 25 °C, the vapor pressure of pure benzene is 100.84 torr. What is the vapor pressure of a solution made from dissolving 14.3 g of biphenyl in 25.8 g of benzene?

84. ## math

when a ball is dropped, it bounces back up 4/5 of the height from the height it was dropped.If the ball dropped from a height of 200cm, how high does it go after bouncing twice.

85. ## physics

a projectile is fired horizontally at 13.4m/s from the edge of a 9.50m high cliff and strikes the ground. (a) what is the horizontal distance it traveled. (b)the elapsed time (c)the final velocity

86. ## math

a chairman and vice-chairman are to be elected from 7 candidates.how many different results are possible ?

87. ## human resources

Hi, What is the most critical factor in setting up a goal based performance appraisal system? A. Choosing the most crical incidents on which to base goals B. Emphasizing short term over long term goals C. Giving emplyees some freedom in their choice

88. ## A&P

what would happen if there were no negative feedbsck control on growth and thyroid hormone

89. ## Probability

An advisor offers 8 mutual funds in the high risk category, 7 moderate, 10 in low risk. The investor decides to invest in 3 high risk, 4 moderate risk, and 10 low risk. How many ways can he do this?

90. ## Chemistry

The rate of a reaction A ---> B is expressed by the rate expression rate=k(A)2. If the molar concentration of A is tripled, the rate of the reaction should increase by a factor of some many?

91. ## Economics

Suppose the consumer has convex preferences, and we know (2, 4) ~(6, 1). Is the statement (4,2.5) >=(6, 1) correct? What about the statement (4, 2.5)> (6, 1)? Suppose now the consumer has strictly convex preferences, and and we know (2, 4) ~ (6,1). Does

92. ## math

we design a new flag.they are 5 colors,blue,red,green,orange and yellow.the flag must have 3 bands of color,how many different flags can be design ?

93. ## Oceanography

why the northeast and southeast trade winds are steady in strength and direction year round but the Northern Hemisphere westerlies alternate from northwest to southwest with summer and winter along the west coast of the United States.

94. ## mechanics of materials

A cylindrical tank with flat endplates is constructed from two sections that are welded together circumferentially.The outer diameter of the tank is 1.20, and the wall of the tank is 20.0 mm thick and the mamimum internal pressure is 2.00 MPa. (a)

95. ## college algebra

Write an equation of the line parallel to the line given by 3x-2y=8 and having the same y-intercept as the line given by 2y+3x=-4 (show work) I am stuck with this problem. Can you please show me how to do these types of equations? Thank you

96. ## Math

Instructions Suppose we have a sequence (1), (2, 3), (4, 5, 6). (7, 8, 9, 10), (11, 12, 13, 14, 15), ... where (1) is the first element of the sequence, (2, 3) is the second, etc. What is the first number in the 100th element of the sequence? Be sure to do

97. ## math

it takes 1 3/4 metres of cloth to make a uniform. a)how many similar uniforms can be use from 10 metres of cloth? b)how much cloth will be left?

98. ## Algebra

Write the expression in descending exponent form. -7y + 8y3 - y6 I think I have to combine like terms but I don't know how. Please help?

99. ## statistics

A set of data consists of 90 observations between 350 and 950. a) What rule would you use to find the number of classes? Use this rule to determine the number of classes? b) What formula would you use to determine the class width or length? Use that

100. ## west chester university

A ball is thrown vertically upward, which is the positive direction. A little later it returns to its point of release. The ball is in the air for a total time of 8.26 s. What is its initial velocity? Neglect air resistance.

101. ## maths

if Arvind cycles 10km/hr ,he reaches the school late by 4min,/if he cycles 12km/hr,he reaches the school early by 2min,find the distance of the school from his home.

102. ## maths

7z-2[3(x-2y)-4{2z-(2y-3y-3x-5z)}]

103. ## chemistry

calculate the number of g fes04 that will be oxidized by 24ml of a 250N Kmn04 in a solution acidified with sulfuric acid. The unbalanced equation for the reaction. The answer 0.912g Who helps

104. ## math

Consider the supply equation where x is the quantity supplied in units of a thousand and p is the unit price in dollars. p=x^3+x+10 Determine the price at which the supplier will make 2,500 units of the commodity available in the market. (Give your answer

105. ## math

a box contain 60 oranges.3/5 of the oranges were equally shared among 4 boys.how many oranges did each boy received.

106. ## statistics

the mean scale score on the mathematics examination of ninth grade students in new york state was 86 with a standard deviation of 5 points. Given a student was selected at random what is the probabilty that his score was 91 or higher?

I am doing a lab and I really need help! I calculated that my snail traveled as his average speed of .136 cm/s, 1.36m/s, and 4896 m/hr. Does that sound right? Also I need help on another thing. My paper says Calculate how long it will take your snail to

108. ## Statistics

An advisor offers 8 mutual funds in the high risk category, 7 moderate, 10 in low risk. The investor decides to invest in 3 high risk, 4 moderate risk, and 10 low risk. How many ways can he do this?

109. ## physics

1. When an ideal gas is expanded adiabatically in volume at constant pressure, the average kinetic energy of the gas molecule: A. Increase B. decreases C. Does no change i know the answer is B but can someone explain why please? i thought it does not

110. ## physics

the effective resistacce of two resistors connected in series is 100 ohm.when it connected in parallel it is 24 ohm.determine the values of two resistors

111. ## College Algebra

Hello - I am stuck on this problem and I'm in serious need of some help. I don't understand this question at all. The problem is: Find the equilibrium quantity and equilibrium demand function for the given: Supply: P=45q Demand: P=q^2+10,000

112. ## 12th science

How will you prepare potassium per magnate.

113. ## Oceanography

How do hurricanes produce storm sures? Why is a storm surge more severe along a coast with a side, shallow continental shelf than along a coast with a narrow continental shelf?

114. ## math

In the U.S., 4634 million pounds of apples were consumed in 2002. The population of the U.S. in that year was 290 million. 1. a medium apple weighs about 5 ounces. estimate how many apples a family of four would have consumed in one month.

115. ## bio(updated) Devron

Please help me with these questions. I have taken out some of the questions that i was a 100% sure of. I just need you to check for me the ones i'm not too postive about. I would really appreaciate the help! Thank you in advance. 1. The phenomenon of

116. ## Chemistry

why would the temperature be higher when making Ammonium Sulphate then when making ammonium nitrate? something to do with hydrogen ions?

117. ## chemistry

How many grams of kmn04 are contained in 35ml of 0.05N kmn04 used in the following reaction in basic solution. the answer 0.0922g who helps

118. ## community umuokpu

if 50cm3 of co2 were put in 40cm3 of Oz. Determine the gas that would be in excess and calculate the volume of the gas that would be used

119. ## Computer language.

a program that prints all the numbers from 1 to 1000 that are divisible by 7. (in C++)

120. ## biology (confused)

Hi Will someone please check my answers. I went to biology-forums(dot)com and registered but i really don't know how to post my questions and i really need help (with the questions). Thanks in advance. 1. Which process involves both passive and active

121. ## community umuokpu. Chemistry

if 50cm3 of Co2 were put in 40cm3 of O2. Determine the gas that would be in excess and calculate the volume of that would be unused

122. ## math

Petrus shared his birthday cake with 5 of his friends. He gave Sandy 1/8,Mary and Paul 1/10 each.he gave Jack 1/5 and Sandy 3/20. What fraction of the cake had he left?

123. ## Statistics

5 selected from batch of 50 produced, if one is found defective, than each is tested individually. Find the probability that the entire batch will need testing if the batch contains: 8 defective phones 2 defective phones

124. ## Calculus

I've been working on this problem for while, and I keep getting the answer wrong every time I do it. The volume of the solid obtained by rotating the region enclosed by y=e^(5x+1) y=0 x=0 x=0.8 about the x-axis can be computed using the method of disks or

125. ## math

if i write the whole numbers from 1 to 500 in a row,what will be the 1000 th digit that i write?

126. ## maths

the perimeter of a rectangle is 340 cm.if its length is decreased by 10% and breadth is decreased by 20% .we get the same perimeter.find the length and breadth of the rectangle.

127. ## arithmetic

determine the secon termof an A.P whose sixth term is 12 and eighth term is 22?

128. ## Math

Solve the piece wise function when f(17) f(x) = f(x-3)+2 if x > 10 -5 if x

129. ## mechanics of materials

A cylindrical tank with flat endplates is constructed from two sections that are welded together circumferentially.The outer diameter of the tank is 1.20, and the wall of the tank is 20.0 mm thick and the mamimum internal pressure is 2.00 MPa. (a)

130. ## English

make a poem on rain, first word of all lines verticaly MUSKAN Like: M................. U.................. S................... k.................... A.................... N...................

131. ## mechanics of materials

6. A flat plate specimen of a soft metal alloy is to be tested by pulling on round pins inserted through the ends of the plate, as illustrated below (a) Calculate the required diameter of the pins, given that the plate is 8.0 mm thick, the maximum tensile

132. ## math

A box with an open top is to be constructed from a rectangular piece of cardboard with dimensions W inches by L inches by cutting out equal squares of side x at each corner and then folding up the sides. (W = 12 in. and L = 20 in). Find the values of x for

133. ## stats

suppose you are to form a scatterplot oby collecting data for the given pair of variables. determine the likely direction form and strngth. Student: high grade point average, student: studying consistency

134. ## Probability

An Adviser has 9 products he wants to tell a client about, but only has time to tell him about 4. How many different ways can he give the details on 4 different products to the customer?

135. ## mechanical properties of materials

A cylindrical tank with flat endplates is constructed from two sections that are welded together circumferentially.The outer diameter of the tank is 1.20, and the wall of the tank is 20.0 mm thick and the mamimum internal pressure is 2.00 MPa. (a)

136. ## community umuokpu. Chemistry

if 50cm3 of co3 were put in 40cm3 of O2. Determine the gas that would be in excess and calculate the volume of gas that would be unused

137. ## World history

Confucius believed that human beings are essentially A. gods. B. evil. C. good. D. sinful.

138. ## physics

a gun can shell targets 15 km away. find (a)the min launch speed needed to achieve that range (b) the shells flight time under these conditions

139. ## biology

Please check my answers. I did my best. 1. Which process involves both passive and active transport? a.)facilitated diffusion

140. ## math

tom receives 4 different shirts and 4 different ties for his birthday.how many different combinations of shirt and tie could he wear?

141. ## maths

factorise 15a^2b^2-20ab+8

142. ## biology help!!

Please check my answers. I did my best. 1. Which process involves both passive and active transport? a.)facilitated diffusion

143. ## physics

A golfer strikes the ball as shown. Letting, α = 23 °, β = 41°, and the initial speed v0 = 6 m/s, determine the x and y coordinates of the place where the ball will land

144. ## Life Orientation

What,according to the BCEA applies with regard to the contravention..refers to Thembi's case study

145. ## algebra

five-sixths of a number is -60. What is the number?

146. ## bio (homeostasis)check

Please Check this for me. 1. Which process involves both passive and active transport? a.)facilitated diffusion

147. ## Probability

5 selected from batch of 50 produced, if one is found defective, than each is tested individually. Find the probability that the entire batch will need testing if the batch contains: 8 defective phones 2 defective phones

148. ## chemical water treatment

a solution is made up of 0.001M dichloroacetic and 0.0001M acetic acid.find the pH using the charge balance

149. ## calculus

Using Young’s rule, if the patient is 3 years old, how much Pepcid is given per dose?

150. ## Pre-calculus

a) A particular ball always rebounds 3/5 the distance it falls. If the ball is dropped from a height of 5 meters, how far will it travel before coming to a stop? Explain the reasoning. b) Prove that if a1, a2, a3, ... is a geometric sequence,then ln(a1),

151. ## pre-calc

how do u find the asymptotes and intercepts of y=2^(x+1) +1 and graph plzzz thxaks uu

152. ## ap chemistry

We observe that 5 grams of a gaseous com- pound occupies 1526 mL at 49C and 672 torr. What is the molecular weight of the com- pound? Answer in units of g/mol

153. ## Oceanography

why on the world average. Earth’s. atmosphere is in motion. Take into consideration the distribution of earth’s surface area with latitude and the variation in heat loss and heat gain with latitude.

154. ## biology (cell bio)

Can someone explain the Nernst Equation and its purpose, in as simple terms as possible? For some reason it's just not clicking with me. Thanks!

155. ## mechanics of materials

6. A flat plate specimen of a soft metal alloy is to be tested by pulling on round pins inserted through the ends of the plate, as illustrated below (a) Calculate the required diameter of the pins, given that the plate is 8.0 mm thick, the maximum tensile

156. ## Boolean Algebra

I need help starting this, I don't want a plain answer just a what to do. (bc'+a'd)(ab'+cd')-Simplify My best guess is to use the distributive property. (a+b)(a+c)= a(b+c). But now that there is a 4th variable what do I do?

157. ## physics

An astronaunt with total mass of 200 kg is working on a satellite when he accidentally pushes away from satellite . While he is holding on tona wrench . What can he do to change his direction?

158. ## mechanical properties of materials

A flat plate specimen of a soft metal alloy is to be tested by pulling on round pins inserted through the ends of the plate, as illustrated below (a) Calculate the required diameter of the pins, given that the plate is 8.0 mm thick, the maximum tensile

159. ## Math

Show that tan(45/2)=2^1/2 - 1

160. ## algabra 2

3/4(20a+12)+1/4(20a+12)

161. ## math

lucy wants to arrange 4 dolls on the shelf,one from spain,a doll from china,one from indonesia and one from mexico.how many different ways are there?

162. ## physics

An astronaunt with total mass of 200 kg is working on a satellite when he accidentally pushes away from satellite . While he is holding on tona wrench . What can he do to change his direction?

163. ## English

Is this grammatically correct? "I can't believe that I'm growing up so fast."

164. ## maths-urgently needed

if p(x) = px^7 + qx^3 + rx - 5 where p , q , r are constants , if p(-7) = 7 then p(7) = ?