# Questions Asked onFebruary 9, 2013

1. ## physical sciene

Neglecting air resistance, how fast is the object traveling when it strikes the gounnd at the end of 3.8s?

2. ## MATH

Find the diameter of a circle with a circumference of 50 mm. Round your answer to the nearest tenth.

3. ## 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

4. ## 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?

5. ## Calculus

The region between the graphs of x=y^(2)and x=2y is rotated around the line y=2. The volume of the resulting solid is... I've tried this five times and no luck. Please help. I think my a=o and b=2. I would appreciate the help.

6. ## math

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

7. ## 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?

8. ## math

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

9. ## 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

10. ## 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

11. ## Math

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

12. ## 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

13. ## maths

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

14. ## 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.

15. ## 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.

16. ## 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

17. ## 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%

18. ## 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?

19. ## maths

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

20. ## 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

21. ## 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

22. ## 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?

23. ## math

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

24. ## lindy

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

25. ## 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 ?

6x=-36

27. ## 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

28. ## 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) = ?

29. ## Geometry

What is another way to figure out the area of a complex figure?

30. ## math

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

31. ## 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

32. ## 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.

33. ## 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?

34. ## 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.

35. ## arithmetic

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

93. ## chemical water treatment

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

94. ## calculus

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

95. ## 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

96. ## 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.

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

98. ## 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),

99. ## 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?

100. ## 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

101. ## 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?

102. ## 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

103. ## physics

8. Electric field lines arising from two small charged particles P and Q. Consider the following two statements: i.The charge on P is smaller than the charge on Q. ii.The electrostatic force on P is smaller than that on Q. Which of the above statements are

104. ## 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?

105. ## World history

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

106. ## 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?

107. ## 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

108. ## 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.

109. ## college chem

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?

110. ## 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.

111. ## Math

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

112. ## 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

113. ## 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?

114. ## 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

115. ## math

solve for x 75=13^x

116. ## 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

117. ## 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.

118. ## 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

119. ## physics

a gazelle attempts to leap a 2.1m fence. assuming a 45 degree takeoff angle, whats the min speed for the jump

120. ## biology

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

121. ## 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?

122. ## physics

A particle revolves in a horizontal circle of radius 3.20 m. At a particular instant, its acceleration is 1.20 m/s 2 in a direction that makes an angle of 55.0º to its direction of motion. Determine its speed (a) at this moment, and (b) 1.50 s later,

123. ## pre-calc

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

124. ## 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

125. ## ap chemistry

On a hot sunny day in August, the weather- man reports that the barometric pressure is 49 atm atmospheres. How many Pascals is this? Answer in units of Pascals

126. ## ap chemistry

Suppose that a sample of gas occupies 117 mL of volume at 25C and a pressure of 289 torr. What would be the volume if the pressure were changed to 490 torr at 25C? Answer in units of mL

127. ## 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.

128. ## 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

129. ## 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

130. ## ap chemistry

A sample of gas occupies 4 mL at STP. At what pressure would this sample occupy 500 mL if the temperature is changed to 525C? Answer in units of torr

131. ## biology help!!

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

132. ## algabra 2

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

133. ## 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

134. ## ap chemistry

What is the density of hydrogen sulfide (H2S) at 0.9 atm and 295 K? Answer in units of g/L

135. ## 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

136. ## 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.

137. ## ap chemistry

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

138. ## 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

139. ## 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

140. ## ap chemistry

We mix 146 grams of oxygen gas with 117 grams of argon gas in a volume of 436 mL at 58C. What will be the final pressure of the gas mixture? Answer in units of atm

141. ## 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

142. ## 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

143. ## 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

144. ## 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

145. ## 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

146. ## 12th science

How will you prepare potassium per magnate.

147. ## Computer language.

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

148. ## 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

149. ## 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)

150. ## maths

points A,B,C and D lie on a straight line in the given order. AC=25cm and BD=46cm. the ratio of length CD to length AB is 5/2. find the length of line segment BC in cm.

151. ## 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!

152. ## 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?

153. ## physics

8. Electric field lines arising from two small charged particles P and Q. Consider the following two statements: i.The charge on P is smaller than the charge on Q. ii.The electrostatic force on P is smaller than that on Q. Which of the above statements are

154. ## accounting

Mikayla, chief financial officer of Napoli Chocolate Company, adopts religious ethical standards. These involve an element of

155. ## 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

156. ## algebra

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

157. ## 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?

158. ## Math

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

159. ## Europe

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

160. ## 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

161. ## bio (homeostasis)check

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

162. ## 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?

163. ## CHEMISTRY

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

164. ## nsu

A microwave oven has a power requirement of 1256 W. A frozen dinner requires 4.0 min to heat on full power. (a) How much electrical energy (in kWh) is used?