Questions Asked on
August 3, 2011

physics
A car of mass 1200kg travelling @ 72 km/h is brought to rest in 4s.Find a) the average deceleration b)the average braking force
asked by Luc 
chemistry
Sodium carbonate reacts with hydrochloric acid as shown below in an unbalanced chemical equation. What mass of CO2 is produced from the reaction of 2.94g Na2CO3 with excess HCL?
asked by Astrid 
physics
A hiker climbs a hill 300m high.If she weighs 50kg,calculate the work she does in lifting her body to the top of the hill
asked by Luc 
English/Writing
According to the authorities; only 35% of the criminals go to jail. a:use a period after "authorities" b:use a comma after "authorities" c:use a colon after "authorities" d:there are no errors  My answer is "d" Is that correct?
asked by Sarah 
physics
A)When the energy input to gas fired power station is 1000MJ,the electrical energy output is 300MJ.What is the efficiency of the power station in changing the energy in gas into electrical energy b)what form does the 700MJ of lost energy take c)what is the
asked by Luc 
chemistry
1. A solution of sodium oxalate has a pH of 7.82. The [OH] in mol/L must be which of the following: a) 6.18 b) 1.5 x 108 c) 6.6 x 107 d) 7.82 e) 7.82 2. When 0.93 mol of O2 and 0.56 mol of NH3 are mixed together and allowed to come to equilibrium
asked by tt 
math
a cylindrical container has a base radius of 14cm and height 18cm. How many litres,correct to the nearest litre, of liquid can it hold. Take 22/7
asked by stella 
statistics
A sales firm receives an average of four calls per hour on its tollfree number. For any given hour, find the probability that it will receive exactly eight calls
asked by Lindsay 
physics
A car of mass 1200kg travelling @ 72 km/h is brought to rest in 4s and has a deceleration of 5m/s find the distance moved during the deceleration
asked by Luc 
chemistry
PCL5(g) > PCl3(g) + Cl2 (g) Kp= 23.6 at 500K Calculate the equlibrium partial pressures of the reactants and products if the initial pressures are Ppcl5 = 0.560atm and Ppcl3 = 0.500atm.
asked by San 
chemistry
What mass of PbCl2 would be found in 0.48 L of a saturated solution of PbCl2 if the Ksp of PbCl2 is 1.6 x 105?
asked by J.T 
math
In a bag there are red, green, black,and white marbles. If there are 6 red, 8 green, 4 black, and 12 white and one marble is to be selected at random, what is the probability it will be white? I don't know how to solve these.
asked by Amy 
chemistry
In a methane fuel cell, the chemical energy of the methane is converted into electrical energy instead of heat that would flow during the combustion of methane. Using the halfreactions and reduction potentials given below a) Write a net equation for the
asked by Vt 
chemistry
In a methane fuel cell, the chemical energy of the methane is converted into electrical energy instead of heat that would flow during the combustion of methane. Using the halfreactions and reduction potentials given below a) Write a net equation for the
asked by Vt 
chemistry
For the equilibrium system below, which of the following would result in an increase in the concentration of CO(g)? 2H2(g) + CO(g) CH3OH(g) + 92 kJ a) decreasing temperature b) adding some CH3OH c) both b and d d) decreasing the volume of the container e)
asked by tt 
chemistry
1.) For which of the following substances is the standard enthalpy of formation equal to zero? a) water [H2O(l)] d) carbon dioxide [CO2(g)] b) lead [Pb(l)] e) tin [Sn(s)] c) carbon dioxide [CO2(s)] 2.) Consider the following four equations: 1. C6H6(l) +
asked by tt 
English/Punctuation/Grammar
"This will not be endured!" he roared. a:correct b:incorrect  My answer is "a" Is this correct?
asked by Sarah 
Geography
How were the traditional Southeast Asian farmers affected by European colonization? A. They became wealthy from the rising values of the cash crops they grew and exported to Europe. B. Unable to compare with large landowners, they were forced to leave
asked by Chandler 
Career research/Decision making
If you borrow money from postsecondary education. a:you never have to pay it back. b:you owe it back. c:none of the above  My answer is "b" Is that correct?
asked by Sarah 
Identifying Furniture Styles & Periods
1. Which one of the following elements is characteristic of Gothic furniture? A. Melonbulb turnings B. Tracery designs C. Carving of acanthus leaves D. Animal shapes 2. A sideboard is a A. type of card table. B. dropleaf table. C. chest of drawers. D.
asked by Suzan 
geometry
The diagonals of a rectangle ABCD meet at O. If angle BOC is equal to 44 degree, find angle OAD.
asked by m.d. 
science
what is the dependent and independant variable, force or pressure?
asked by mark 
Mathematics
1. Show that Sin3è  Cos2è = (1  Sinè)(4Sin^2è + 2Sinè  1). Without using a calculator, show that è = 18 degrees is an exact solution of the equation Sin3è = Cos2è. Justifying your answer, find the exact values of: i) Sin18 degrees. ii) Sin234
asked by Edwards 
Math
There are a total of 107 chickens and rabbits on a farm. The total number of legs of rabbits is 56 more than the total number of legs of chickens. How many chickens are there on the farm?
asked by James 
Human Services
Calculate the fixed cost, variable costs, and breakeven point for the program suggested in Appendix D. BASED ON THE ASSIGNMENT DIRECTIONS FOUND IN THE COURSE MATERIALS FOLDER. · Base your calculations on the financial data for 2002. XYZ NONPROFIT
asked by Isabella 
Biochemistry
Given that ∆Go’ = 15 kJ/mol and k1 = 1.5 X 106s1, calculate k2.
asked by Ashley 
prealgerbra
step by step how to solve algerba problems
asked by Carus II 
maths
The second angle of a triangle is 4 times as large as the first. The third angle is more than the sum of the other two angles. Find the measure of all three angles.
asked by susan 
pre calc
A graph of y = cos(1/2 x)  sin( x) for 4ð x 4ð is shown in the figure. Assume z = 4. (the figure is just the graph) its asking me to find the x intercepts but i don't know how. it also asks me to find: The xcoordinates of the eight turning points on
asked by g 
social studies
Conduct a research to examine the sphere of influence of an organisation that renders a service in your area,hospital.purpose of the organisation.
asked by Sphere of influence 
biology
an investigation was done to determine the role of petals in insect pollination in apple flowers.when flowers are self pollinated,the tubes grow a little into the stigma and style and fertilization does not take place.(1)10 flowers with petals and 10
asked by Region 
buiness math
3(4x=5)=63
asked by torae 
maths
A pie graphs show the budget of 2 business for 2 different business.How do you work out the different expenses each month and Calculated the cost in Rands.1 company budget is R12000 and other is R9200.How do u work out the pie graphs .need to get the
asked by zubeida 
chemisty
Farmers often spray water on plants when there is a chance of frost to protect them from freezing. Calculate the amount of heat released when 100 mL of water at 25oC cools to 2oC. (ΔHfusion water is 6.03 kJ/mol, cwater = 4.18 J/(goC), cice = 2.01
asked by Vt 
chemistry
What mass of PbCl2 would be found in 0.48 L of a saturated solution of PbCl2 if the Ksp of PbCl2 is 1.6 x 105?
asked by J.T 
French
Is this French sentence correct: "Dans cet article, il s’agit des nouvelles taxes établies" if I wanted to say "This article is about the new established taxes.
asked by dannytan 
Chemistry
How many moles of Ne occupy 2.0 L at STP?
asked by Nrsn9398 
physics
What are the maximum values of the following when an incandescent 55W light bulb (at 110 V) is connected to a wall plug labeled 110 V?
asked by Sophia 
physics
A transformer with 360 turns in its primary coil and 18 turns in its secondary coil is designed to delivered an average power of 1400 W with a maximum voltage of 60 V. What is the maximum current in the primary coil?
asked by Sonia 
science
determine your distance traveled and displacement if you walk 100m forward and then 35m backward
asked by stacey 
Helping Abused children
Please help 4. As a teacher aide, if you report an incident of child abuse, A. you must be able to prove your allegations to the authorities. B. you’ll most likely be asked to testify in court. C. you should keep all information related to the case
asked by beth 
algebra
Will someone check my work here and let me know if I am right. Thanks. Evaluate x+y/7 for x=44 and y=12 My answer is x+y/7=8 2. Translate to an algebraic expression. The product of 42% and some number. The translation is .42x=y 3. Use < or> to make the
asked by babs 
physics
An apple of mass 0.1kg is thrown from a 54 meter high building at an angle of 45 degrees with an initial velocity of 7. How long does it take for the apple to hit the ground? (assume g = 9.8 m.s2)
asked by Anonymous 
chemistry
An 8.6 g sample of a metal is heated to 110.0oC and then placed in a coffee cup calorimeter containing 125 g of water at a temperature of 23.00oC. After the metal cools, the final temperature of the metal and water is 26.83oC. Assuming that no heat is lost
asked by TI 
intermediate algebra
SOLVE BY FACTORING 2a^23a=5
asked by ROCKY 
physical science
A 4.0 m ladder leans against a vertical wall and makes an angle with the horizontal ground of 52degrees. What is the height above the ground where the ladder makes contact with the wall?
asked by portia 
chemistry
Given that ΔHof of copper (II) chloride, CuCl2(s), is –220.1/kJ and ΔHof of copper (I) chloride, CuCl(s), is –137.2 kJ, calculate ΔHo for the reaction when 14.0 g of copper is used: CuCl2(s) + Cu(s) → 2 CuCl(s)
asked by tom 
math
what is (x to the 3rd power + x to the 2nd power) divided by ((x+4)(X4)) multiplied by (x+4) divided by (3x to the 4th power + x to the 3rd power + 2x to the 2nd power)
asked by kellie 
algebra
Please check these too. thanks Simplify 6[86(9486)]= my answer is 468 2. On three consecutive passes, a football team gains 6 yards. loses 17 yards and gainbs 31 yards. Wht number represents the total net yards. The total net years is 20 yards. 3. Solve
asked by babs 
math
Write the slopeintercept equation for the line with slope 2/3 and yintercept (0, 3) and graph the line. Please show all of your work. (
asked by susan 
art
10th century copper sculpture illustrated work of artist peforming "giving tangible form to the unknown" the unknown case in this is what diety
asked by Anonymous 
chemistry
1.If its molar solubility is designated by “x”, then which of the following expressions best represents the solubility product for the substance Ag2SO4? a) x2 b) 27x4 c) 4x3 d) 108x5 e) 3x4 2. Consider the equilibrium, 4HCl(g) + O2(g) 2H2O(g) +
asked by tt 
algebra
Solve 8x(4x+4)=20 Ms. Sue would the answer be 3/2?
asked by babs 
Calculus
put function in standard form f(x)=4x^232x+9
asked by Josh 
CJ101
Describe what SARA is and explain how it is used in fighting crimes. In what type of policing model is SARA most effectively used? Why?
asked by CHASE 
algebra
would the answer to 8x(4x+4)=20 would that be 6 then? I posted it wrong before thank you for helping
asked by babs 
bio
Name some plants (or even animal products) that are said to have properties that are beneficial to humans. Describe how you would show whether those claims are true. please a need help i am in the hospital
asked by Anonymous 
maths
Write the slopeintercept equation for the line that passes through (2, 4) and has slope 7/2.
asked by kimberly 
intermediate algebra
rewrite with positive exponents. Assume that even roots are nonnegative quanities and that all denominators are nonzero. [3/ua^2)^4
asked by ROCKY 
science
Write ideas for the inquiry project and area of expertise
asked by naiya 
English
It also affects the way in which one family relates to another, to the neighborhood, and to the community What correction should be made to this sentence?
asked by Anonymous 
Algebra II
this is the question: Rewrite the equation with the right side completely factored. N =2x^2 + 76x + 430
asked by Lynn 
math
7(ac + 2b) + 2ac
asked by Anonymous 
Vocab./English
The mom left the room with a MODICUM (small amount) of respect after her baby began... a:sleeping b:screaming  My answer is "a" is that correct?
asked by Sarah 
math
A pie graph show two different business if transport is the greatest expenses of one is how do u Calculates the cost in rands•
asked by zubeida 
COM155
Use at least five adverbs and five adjectives to write a brief review of a movie, sporting event, musical performance, or television show. Bold each adverb. Underline each adjective. Compare the event to one or more similar events. When comparing, use at
asked by Anonymus 
English/Writing
An appositive is a noun that is placed after another noun in order to tell more about it an it's usually set off with commas. a:true b:false  My answer is "a" Is that correct?
asked by Sarah 
Chem/Solution Concentrationa
How many gtams of potassium bromide(KBr), could be recovered by evaoportating 650.g of 15 percent KBr solution to dryness? Can you explain how to solve this?
asked by Terr 
physics
A box of mass 5 kg is pulled along a horizontal frictionless surface by a force of 40N inclined @ 30dgrees. Calculate A)the work done by the force over a distance. B)the speed gained by the box after travelling 10m.
asked by Luc 
Latin American History
________ or "government by a few" is common in Latin America. a:democracy b:republic c:oligarchy d:dictatorship  My answer is "c" Is that correct?
asked by Sarah 
Physics
A chair lift carries people of average mass 75kg to a height of 450m above the starting point. Calculate a) the work done by the chair lift to move one person through 450m. b) the power expended to carry 60 people every 5 minutes.
asked by Luc 
math
give me an ex. about close to 1,1/2,0 pls. for my project THANKS
asked by rosswyn 
MATH
about math EX. 9/10 is close to 1 THANKS AGAIN
asked by rosswyn 
physics
A block of mass 2kg is pushed along a table with a constant velocity by a force of 5N.When the push is increased to 9N,what is a)the resultant force b)the acceleration
asked by Luc 
world regional geography
2. _______ is one of the first Latin American countries to have a separate ministry of tourism with dedicated funds within its federal governmental structure.
asked by jerry 
Calculus 2
The volume of the solid generated by revolving the region about the given line. above the curve y=3 below the curve y=sqrt of 3x on the left by the yaxis the line y=3
asked by Larry 
physics
How much work is done when a mass of 30N is lifted vertically through 6m
asked by Luc 
Ag econ
How do you prove marginal profitability of implementing precision ag practices to a farm operation.
asked by Thomas 
physics
In loading a lorry a man lifts boxes each of weight 100N throughta height of 1.5 m. a)how much work does he do in lifting 1 box b)how much energy is transferred when 1 box is lifted c)if he lifts 4 boxes/minute@ what power is he working
asked by Luc 
math
what is the numeral for two million, five and three hundred fiftyone thousandths
asked by kita 
math
In their little league baseball season, Dominick had twentyfour hits in his forty times at bat. Michael had eighteen hits in his thirty times at bat. How many more hits per at bats did Dominick have?
asked by drea 
physics
A load of 500N is raised 0.2m by a machine in which an effort of 150N moves 1m.What is a) the work done on the load b)the work done by the effort c)the efficiency
asked by Luc 
maths
show that sin3thetacos2theta =(1sin theta)(4sin squared theta + 2sin theta 1)
asked by victor2 
biology
Based on what you know about phenotypes and figure 2 for the p generation what is the corn plant genotype on each cob containing the P corn kernals
asked by kate 
biology
from the phenotype of the kernals on each P generation cob what would the predicted genotype of any F1 plant be?
asked by kate 
maths
show that sin3thetacos2theta =(1sin theta)(4sin squared theta + 2sin theta 1)
asked by victor2 
mathematics
Given that A + B = 120 degrees and cosA + cos B = 1 divided by squareroot of 2,show that cos AB divided by 2 = 1 divided by square root of 2
asked by ceasar 
physics 1
a 5.00kg object placed on a frictionless horizontal table is connected to a string tat passes over a pulley and then is fastened to a hanging 9.00kg object.Find the acceleration of the two objects and the tension in the string.
asked by Ian 
maths
tan5x/4x as lim x approaches to pi
asked by rohan 
Chemistry
1. Show quantitatively how you would prepare a solution of 3.10 x 10^2 g of 0.125 molar (m) ethylene alcohol from ethylene glycol and water.
asked by eddy 
Math 209
The width of a rectangular carpet is 7 meters shorter than the length, and the diagonal is 1 meter longer than the length. What are the carpet's dimensions?
asked by Wanda 
mathematics
give that sin( A + B )= 2cos(A  B ) and tan A = 1/3,Find the exact value of tanB
asked by CHRYSTABELLE 
Chemistry
1. What amount of Potassium Chloride forms when 5.25 litres of Chloride gas at 0.95 atm and 293K reacts with 17.0g of Potassium.
asked by Kam 
English
I need to prepare different grammar tests. I really hope you can see if everything is OK. 1) Ask for the information in the bold part of the sentence. (6 pts.) 1.It usually takes him half an hour to drive to work. 2.Sandra was hurrying to school yesterday
asked by Henry 
English
I still have to include a few more exercises. Thank you very much. 1) Complete the sentences with must/mustn’t, have to/don’t have to, should/shouldn’t (9 pts.) 1) My mum is angry with me. I ................ stay in my room an study in the afternoon.
asked by Henry 
math
A building has 7 storeys. If the interior length is 41 m and the width is 32 m, What is the total floor space in the building including open spaces for stairs, etc?
asked by Rona 
Math
Solve the equaton by completing the square. 4x^28x3=0
asked by Ashley 
Math
Is 0 is even no?
asked by Abhishek kumar 
Physics
A spring id vertically, as shown below, and a 500g mass is hung from its lower end. The EQUILIBRIUM extension of the spring is observed to be 10.0cm. (I) What is the spring constant of the spring? (II) If the is pulled down by 5.00cm and released, what is
asked by Melissa 
physics
consider a solid cylinder rolling from rest down a plane inclined at an angle theta to the horizontal.After rolling down a distance s down the plane,determine (i) acceleration of the cylinder (ii) if the cylinder is hollow ; find its acceleration after a
asked by victor2 
Elementray Statistics
Assume that a population is normally distributed with a mean of 100 and a standard deviation of 20. Would a sample mean of 115 or more be considered unusual? Why or why not?
asked by Alice 
english
Will s person that is born deaf(deaf since birth) be able to speak? please provide a proof for your answer(i.e. website)
asked by Chester 
English
Here is my outline for my speech. How does it look? I know I need a better conclusion, I am just not sure exactly yet. Aggressive Driving Introduction • How many of you have turned on the news or opened a newspaper to find that another human being was
asked by lizzie 
Math 221
What if the size for each sample were increased to 20? Would a sample mean of 115 or more be considered unusual?
asked by Nicole 
Chemistry
4. During a practical exercise, you find out that you need to adjust the pH of a strong acidic solution of volume 5.6 litres from 4.52 to 5.25 (i) What would you add, OH or H3O+ to adjust the pH? Explain your answer. (ii) Assuming that there is a
asked by Edwards 
Writing
Please help.. Did i identify all of the adverbs and adjectives in the following? I personally did not have any credit cards for a very long time. In the past, I have had more then I needed and found them only causing me problems. I was young and not very
asked by Anonymous 
mathematics
Show that for any p and q on the line ,the distance from p+q/2 is the same as the distance from p+q/2 to q.
asked by CHRYSTABELLE 
mathematics
Find the equation of the smaller circle tangent to both axes and passing the point (3,6)
asked by ceasar1 
mathematics
Find the equation of the parabola with the vertex at the origin and directrix y =5
asked by victor 
maths
simplify 121/9 /4/3+(1/2)^2
asked by kate 
maths
simplify 3(9)[53]
asked by sofiya 
college algebra
COMPOUNDS P=2500, r=12%, t=20yrs, n=2
asked by shakera 
Mathematics
1. Show that Sin3 Theta  Cos2 Theta = (1  Sin Theta)(4Sin^2 Theta + 2Sin Theta  1). Without using a calculator, show that Theta = 18 degrees is an exact solution of the equation Sin3 Theta = Cos2 Theta. Justifying your answer, find the exact values of:
asked by Edwards 
Calculus
When Pal throws his beach ball straight up in the air, it's height h at time tis given by h=(1/2)gt^2+v(sub 0). Find the velocity of the ball at time t.
asked by Jordan 
Calculus
When Pal throws his beach ball straight up in the air, it's height h at time tis given by h=(1/2)gt^2+v(sub 0). Find the velocity of the ball when t=0.
asked by Jordan 
Science
TRUE or FALSE? when ice cubes melt into liquid water, its physical properties changes
asked by Floyd 
Geometry
306090 triangle has a hypoteneuse of 10 use trig to find the short side
asked by Christa 
maths
3. Simplify. 2y+y^2xy(xyy+3y^2)
asked by susan 
math
4. Solve . 162(8w7)=3w18(2w)
asked by susan 
math
can someone help me to make this a non function. f(x){(1,8),(3,4),(5,0),(9,4),(10,2)
asked by tamika 
maths
factorize (x^24x)(x^24x1)20
asked by pavatharani 
maths
factorize 2*2^1/2x^3+3*3^1/2y^3+5^1/2(53*6^1/2xy)
asked by pavatharani 
maths
if a=(3^1/2+2^1/2)/(3^1/22^1/2) b=(3^1/22^1/2)/(3^1/2+2^1/2) find a^3+b^3
asked by pavatharani 
maths
if x=1/(23^1/2) prove that x^32x^27x+5=3
asked by pavatharani 
maths
if x=3+8^1/2, find x^4+(1/x^4)
asked by pavatharani 
maths
factorize a^3+b^3+c^33abc
asked by pavatharani 
maths
if the sides of a triangleABC is 16cm,19cm and 15cm what about the angleB is it the greatest or smallest angle or is angleB = angleC or ia angleA the smallest angle? plz help
asked by pavatharani 
chemisty
Farmers often spray water on plants when there is a chance of frost to protect them from freezing. Calculate the amount of heat released when 100 mL of water at 25oC cools to 2oC. (ΔHfusion water is 6.03 kJ/mol, cwater = 4.18 J/(goC), cice = 2.01
asked by Vt 
as
In the figure a 1.2 block is held at rest against a spring with a force constant = 740 . Initially, the spring is compressed a distance . When the block is released, it slides across a surface that is frictionless except for a rough patch of width 5.0 that
asked by Anonymous