Friday
October 24, 2014

Posts by alex


Total # Posts: 2,643

Science
Carbon monoxide, CO, and hydrogen, H2, react according to the reaction below. 4 CO(g)+ 9 H2(g)--> C4H10(g)+ 4 H2O(g) What volume of the excess reactant remains if 19.6 L CO and 27.2 L H2 are allowed to react. Assume that the volumes of both gases are measured at 713oC and 1...
October 22, 2014

Chemistry
What is the pressure (in mmHg) of the gas inside the apparatus below if the atmospheric pressure is Patm=748 mmHg, h1=40 mmHg, and h2=67 mmHg?
October 22, 2014

Math
State whether the function y=-2x^2-8x+17 has a maximum or minimum value and identify the coordinates of the vertex.
October 22, 2014

Chemistry
A 35.0-L cylinder contains 387 g O2(g) at 22.5°C. What mass of O2(g) must be released to reduce the pressure in the cylinder to 5.94 atm, assuming the temperature remains constant?
October 21, 2014

Chemistry
What is the pressure (in mmHg) of the gas inside the apparatus below if the atmospheric pressure is Patm=748 mmHg, h1=40 mmHg, and h2=67 mmHg?
October 21, 2014

Physics
a boat moves through the water of a river at 5.8m/s relative to the water, regardless the boat's direction. if the current is flowing at 5.04m/s, how long does it take the boat it take the boat to complete a trip consisting of a 443m displacement downstream followed by a ...
October 20, 2014

Physics
The answer was 22.2m...
October 20, 2014

Physics
A 4.58 kg block located on a horizontal floor is pulled by a cord that exerts a force F = 10.5 N at an angle theta = 25.5° above the horizontal. The coefficient of kinetic friction between the block and the floor is 0.09. What distance does the block travel in a time of 5....
October 20, 2014

Math
Hi, I need help with figuring out how I calculated this question because my math teacher is asking "But my question is how do you get √2/2 How did you come up with that calculation?" Here's the question and my work for it: Chang is participating in a ...
October 17, 2014

Math
why would I have uarrived at square root 2 over 2 in this question Chang is participating in a charity bicycle road race. The route starts at Centreville and travels east for 13 km to Eastdale. He then makes a 135° turn and heads northwest for another 18 km, arriving at ...
October 17, 2014

6th grade math
a diver's elevation is -30 feet relative to sea level. she dives down 12 feet. what is her elevation after the dive? a. 12 feet b. 18 feet c. -30 feet d. -42 feet
October 15, 2014

physics
Consider three force vectors F1 with magnitude 42N and direction 140°, F2 with magnitude 27N and direction -110°, and F3 with magnitude 19N and direction 120°. All direction angles 0 (0 with a line inside) are measured from the positive x axis: counter-clockwise ...
October 13, 2014

physics
A person walks 27m east and then walks 31m at an angle 38° north of east. What is the magnitude of the total displacement. Answer in units of m
October 13, 2014

physics
A particle undergoes two displacements. The first has a magnitude of 135cm and makes an angle of 114° with the positive x axis. The resultant displacement had a magnitude of 183cm and is directed at an angle of 21.8° to the positive x axis. Find the magnitude of the ...
October 13, 2014

physics
A car travels 15.5 km due north and then 38.6 km in a direction φ = 74.3 ◦ west of north.Find the magnitude of the car’s resultant displacement. Answer in units of km
October 13, 2014

physics
A frictionless massless pulley has 7 kg tied to a cable on the left side and an unknown mass (M) on the right. The unknown mass accelerates downward at 6.6 m/s2 What is the accelerationof the system/tension of the rope
October 13, 2014

polar co ordinates
thanks so much ill have a look
October 13, 2014

polar co ordinates
how do you obtain the cartesian equation for r^2=16cos(3theata)?? I've tried looking on many website and at my notes but have had no luck. i know that r^2=x^2+y^2 and x=rcos(theta) but don't know were to go from here?
October 13, 2014

physics
suppose the force of 20.0 N pushes on two boxes of unknown mass. We know, however, that the acceleration of the boxes is 1.25 m/s2 and the contact force has a magnitude of 2.73 N. (a) Find the mass of box 1. (b) Find the mass of box 2. So do I subtract the contact force from ...
October 11, 2014

physics
In a tennis serve, a 0.070 kg ball can be accelerated from rest to 41 m/s over a distance of 0.90 m. Find the magnitude fo the average force exerted by the racket on the ball during the serve. I know it is a force problem, but I am not even sure how to set this up.
October 11, 2014

Math
What are the restrictions on x if the solution to the equation -4 - square root 4-x=6 involves real numbers?
October 10, 2014

Physics
The mass of a sports car is 1200 kg. The shape of the car is such that the aerodynamic drag coefficient is 0.250 and the frontal area is 2.30 m2. Neglecting all other sources of friction, calculate the initial acceleration of the car ,if it has been traveling at 85 km/h and is...
October 9, 2014

economics
I need to address computer ability to grow the Gross domestic product ,create competition and make other industries efficient help me?
October 9, 2014

Physics
A baseball is hit straight up in the air with an initial velocity of 26.7 m/s. How long in seconds does it stay in the air? (Hint: What is the overall distance of the ball?)
October 8, 2014

Literature
A
October 8, 2014

Math
A company manufactures fence sections for residential use. The number, s, of sections that can be produced per day is related to the number of hours, h, of labour required by the function s=2.1 square root h (Show your work) a) State the domain and range for the function. (2 ...
October 8, 2014

algebra
What is a quartic polynomial function in standard form with zeros 1, –2, –2, and –3?
October 8, 2014

Chemical Engg
Hello, where can i find the process flow diagram of a dyehouse? I searched on google, but in vain I really need a picture showing all the steps in the dyehouse plz!!
October 8, 2014

Math
A ball that is hit or thrown horizontally ball that is hit or thrown horizontally with a velocity of v metres per second will travel a distance d metres before hitting the ground, where d=v square root h/ 4.9 and h is the height, in metres, from which the ball is hit or thrown...
October 7, 2014

Physics
A basketball is thrown at 45° to the horizontal. The hoop is located 6.2 m away horizontally at a height of 1.1 m above the point of release. What is the required initial speed? I know that I need to use d = vit + (0.5)at^2, but I then get stuck. Thanks!
October 4, 2014

Algebra
(3x^2-4x^3+7)+(-5x+11-7x^3-4x^2)
October 2, 2014

Math
What is the answer to 4 square root 1280 r^8 t^12 ?
October 1, 2014

Chemistry
How many grams of HCl are produced if the following reaction yielded 27.1 grams of H3PO4? PCl5 + 4 H2O --> H3PO4 + 5 HCl
September 30, 2014

Math
Solve the following e^-x (square root((3e^2x) - 5/4)) = e^x
September 29, 2014

Algebra
How do I simplify this problem. (2nr - nr^2)r - (2nr - nr^2) . 2r
September 28, 2014

physics
An electron in the cathode ray tube of a tele- vision set enters a region where it acceler- ates uniformly from a speed of 30100 m/s to a speed of 3.82 × 106 m/s in a distance of 2.97 cm. What is its acceleration? Answer in units of m/s2
September 28, 2014

Algebra
Adding and subtracting polynomials. Can someone help me solve this problem? 5x^3 . 2x^2 - 10x^4 + 3x^5 + 3x .(-2)x^4 . = The dot means to multiply. Thank you.
September 28, 2014

physics
An electron, starting from rest and moving with a constant acceleration, travels 5.8 cm in 14 ms. What is the magnitude of this acceleration? Answer in units of km/s2
September 28, 2014

Algebra 1
Adding and subtracting polynomials. (6-t-t^4) + (9t+t^4) How do you solve this problem?
September 27, 2014

Math
I already know the angle of Eastdale which is 45° due to the turn from due east to the northwest. So therefore so I need to find the measures of angle c and angle n. I can use the Law of Sines. sin‹C/c=sin‹E/e sin‹C/18=(√2/2)/12.7308 sin‹C=18(&#...
September 26, 2014

English
What rites of passage do individuals confront in the selection my brothers keeper?
September 25, 2014

Math
Why would you use square roots in the following question: Chang is participating in a charity bicycle road race. The route starts at Centreville and travels east for 13 km to Eastdale. He then makes a 135° turn and heads northwest for another 18 km, arriving at Northcote. ...
September 25, 2014

Math
State the side length of a square with an area of 27 cm2 in simplified radical form.
September 25, 2014

Math
What is ^4 square root 1280r^8 t^12 in simplified form?
September 25, 2014

Math
What is the vertex of y=7(x+5)^2+4?
September 24, 2014

math
The school cafeteria serves pizza every 6th day and applesauce every day Thursday supposed to pizza and applesauce are both on today's menu in how many days will they be together on the menu again?
September 23, 2014

Chemistry
Since a hydrogen atom consists of just one proton and one electron, it should have a mass of 1.673 x 10^-24 g. And so it does. Calculate how many hydrogen atoms you'd have if you had 5.6 g of hydrogen.
September 23, 2014

Math
The sine ratio is positive in the first and what other quadrant?
September 23, 2014

Math
Two wires are connected to a tower at the same point on the tower. Wire 1 makes an angle of 45° with the ground and wire 2 makes an angle of 60° with the ground. b) Which wire is longer? Explain. (2 marks) c) If the point where the two wires connect to the tower is 35 ...
September 23, 2014

Math
The expression cos 60° is equivalent to sin ?
September 23, 2014

Analytical Chemistry (Titrations)
Is molarity also called the concentration of the solution? I got 0.1641 M HCl. Thank you for your help!
September 23, 2014

Analytical Chemistry (Titrations)
I forgot: What is the concentration of the solution?
September 23, 2014

Analytical Chemistry (Titrations)
About 10ml of concentrated HCl was transferred to a 1-L volumetric flash and diluted to mark with distilled water. When this solution was used to titrate a sample of pure sodium carbonate, Na2Co3, weighing 0.3054 gram, it took 35.09 ml to reach the methyl red end point. The ...
September 23, 2014

Math
Which of the following triangles cannot be solved using the sine law? a) angle a= 28 degrees, angle b= 75 degrees, side a= 24 cm b) side a=4 cm , side b= 11 cm c) angle a=28 degrees, angle c= 34 degrees , side b=5 cm d) angle b= 29 degrees, side b=5 cm, side c=18 cm
September 22, 2014

physics
In order to qualify for the finals in a racing event, a race car must achieve an average speed of 276km/h on a track with a total length of 1520m. If a particular car covers the first half of the track at an average speed of 246km/h, what minimum average speed must it have in ...
September 21, 2014

physics
A speedy tortoise can run at 0.08 m/s, and a hare can run 16 times as fast. In a race, they start at the same time, but the hare stops to rest for 2 min, so the tortoise wins by a shells(20cm). How long does the race take? Answer in units of s
September 21, 2014

Math
Solve the following triangle, rounding side lengths to the nearest tenth of a unit and angle measures to the nearest degree. angle a = 153 degrees, b= 5, a=10.5
September 21, 2014

Math
Marco is 350 m due east of the centre of the park. His friend Ray is 350 m due south of the centre of the park. Which is the correct expression for the exact distance between the two boys?
September 20, 2014

Math
The first prize in a lottery is $250 000. Each winner chosen after the first is paid 20% as much as the winner before them. Determine a formula for the sum of n terms of the geometric sequence.
September 19, 2014

Math
For each arithmetic sequence, determine a) the value of t1 and d (2 marks) b) an explicit formula for the general term (2 marks) c) t20 (2 marks) 3a, 3a – 2b, 3a – 4b, 3a – 6b, …
September 19, 2014

Algebra 2
ok I get it. But what's the actual answer
September 19, 2014

Algebra 2
determine all symmetries of the function g(x)=x/x-1
September 19, 2014

Algebra
so you don't know
September 19, 2014

Algebra
Given a point (-2,5), determine a point that satisfies the specified symmetry. 1.)Origin 2.)y-axis 3.)x-axis 4.)y=x
September 19, 2014

Math
Find the value of term 1 given S8 is equal to -3280 and the common ratio is equal to -3?
September 19, 2014

Math
a) the value of t1 and d (2 marks) b) an explicit formula for the general term (2 marks) c) t20 (2 marks) 3a, 3a – 2b, 3a – 4b, 3a – 6b, …
September 18, 2014

Math
b) an explicit formula for the general term (2 marks) c) t20 (2 marks) 7/4, 1, 1-4, -1/2
September 18, 2014

Math
For each arithmetic sequence, determine a) the value of t1 and d (2 marks) b) an explicit formula for the general term (2 marks) c) t20 (2 marks) 7/4, 1, 1/4, -1/2
September 18, 2014

Math
Determine whether each sequence is geometric, arithmetic, or neither. Justify your answer. 1/5, 1/4, 1/3,1/2,1
September 18, 2014

Math
Find the value of term 1 given sum 8= - 3280a and the common ratio = - 3?
September 18, 2014

Math
A Registered Education Savings Plan (RESP) earns interest at a rate of 5% per year, compounded annually. Jasmine’s parents invest $4000 in the account today. a) Determine an explicit formula to represent the value of the investment. (2 marks) b) Use your formula to write ...
September 18, 2014

Math
The first prize in a lottery is $250 000. Each winner chosen after the first is paid 20% as much as the winner before them. b) Determine an explicit formula for the general term. (2 marks) c) Determine a formula for the sum of n terms of the geometric sequence. (2 marks) d) If...
September 18, 2014

Math
If S1 = 0.7 and S2 = 2.1 in a geometric series, determine the sum of the first 12 terms in the series. Be sure to show all of your work.
September 17, 2014

Math
The sum of the first two terms of an arithmetic series is 15 and the sum of the next two terms is 43. What are the first four terms of the series?
September 17, 2014

Math
Etienne owns a small recycling company that picks up empty glass bottles from restaurants. At the first restaurant, he picks up 50 bottles. At each restaurant after this, he picks up 4 more bottles than he picked up at the restaurant before. Assume that this pattern continues...
September 17, 2014

Math
What is the sum of the infinite geometric series 15 + 15(1/3)+ 15(1/3)^2 + 15(1/3)^3?
September 17, 2014

Math
The sum of the geometric series 9 + 45 + 225 + 3 515 625 is ?
September 17, 2014

Math
An explicit formula for the general term for the arithmetic sequence 7/4,1, 1/4, -1/2?
September 17, 2014

Math
The first prize in a lottery is $250 000. Each winner chosen after the first is paid 20% as much as the winner before them. a) Determine t1 and r for the geometric sequence that represents this situation. b) Determine an explicit formula for the general term. c) Determine a ...
September 17, 2014

Math
Consider the arithmetic series 7 + 19 + 31 + 43 + 55 + pr004-1.jpg. a) How many terms are less than 1000? (3 marks - show your work) b) How many terms are less than 2000? (3 marks - show your work)
September 16, 2014

Math
Determine the sum of the infinite geometric series 28 + 14/3 + 7/9 + 7/54 ?
September 16, 2014

math
Suppose someone gives you 8 to 2 odds that you can not roll two even numbers with the roll of two fair dice. This means you win $8 if you succeed and you lose $2 if you fail. What is the expected value of this game to you? Should you expect to win or lose the expected value in...
September 15, 2014

Physics 1
You are to drive to an interview. The interview is at 11:15 a.m. You plan to drive at , so you leave at 8:00 a.m. to allow some extra time. You drive at that speed for the first , but then construction work forces you to slow to for . What would be the least speed needed for ...
September 11, 2014

Physics
A tennis player hits a ball 1.6 m above the ground. The ball leaves the racket with a speed of 12 m/s at an angle 8.0 degrees above the horizontal. The net is a horizontal distance of 7.0 m away from the player and is 1.0 m high. (a.) Does the ball clear the net? Explain how ...
September 10, 2014

Physics1
3, I got it thank you!
September 10, 2014

Physics1
A vector is drawn with its tail at the origin of an xy coordinate system. In which quadrant does the vector point if the angle with respect to the positive direction of an x axis is -135°?
September 10, 2014

math
Find an equation of the line that satisfies the given conditions. Through (−7, −12); perpendicular to the line passing through (−4, 0) and (0, −2)
September 7, 2014

Chemistry
59.0 mL of a 1.60 M solution is diluted to a total volume of 268 mL. A 134-mL portion of that solution is diluted by adding 111 mL of water. What is the final concentration? Assume the volumes are additive.
September 7, 2014

Advanced algebra
In which distributions does the variable, X, have a binomial distribution? (Choose all that are correct) When a 6-sided number cube is rolled 3 times, X is the number of 2s rolled. When a 6-sided number cube is rolled, X is the number of times rolled before a 2 appears. When a...
September 5, 2014

Advanced algebra
In which distributions does the variable, X, have a binomial distribution? (Choose all that are correct) ~When a 6-sided number cube is rolled 3 times, X is the number of 2s rolled. ~When a 6-sided number cube is rolled, X is the number of times rolled before a 2 appears. ~...
September 5, 2014

English 10
What poetic devices were used in the poem "What Was Told, That"? What did these poetic devices do for this poem? Did these devices help create imagery or communicate the author’s feelings? Please and thank you!
September 5, 2014

ethics
B if you're theories and literature anchors on the developmental side of humans A if you're doing research on experimental psych
September 4, 2014

algebra
all real numbers that are greater than -6 but less than 6. i kinda get it but im confused with the symbols(<,>) i dont now which ones greater or which ones less its confusing
September 4, 2014

Chemistry
When a 1.1 gram ice cube is placed into a 10.0 mL graduated cylinder, the level of water inside the graduated cylinder raises 1.20 mL. What is the Density of the ice cube? My Work: Density = 1.1g/10.0 mL + 1.20 mL? my answer came out to be; Density= .0982 g/mL
September 3, 2014

Biology
PCSK9, a protease that regulates the level of LDL receptors, is a new target for lowering circulating levels of LDL. Excess PCSK9 leads to a decrease in LDL receptor levels. Which one of the following tools would you use in mice to model a potential therapy for humans with ...
September 2, 2014

Algebra 2
5.) A boat makes a trip downstream in 5 hours. The return trip against the current takes 12 hours. If the speed of the current is 3 1/2 km/h, what is the speed of the boat in still water? 6.) How far does the boat referred to in Exercise 5 travel (one-way)?
August 31, 2014

Algebra 2
Worldwide Airlines flies from Lakeside to Whichitfalls in 4 hours with a tail wind, The return trip against the wind takes 5 hours. Whichitfalls is 5040km from Lakeside. Find the speed of the plane and the velocity of the wind. Would you get on the plane?
August 31, 2014

English 12
Which character is described in these lines? (10 points) Lord of the Scyldings, this single petition? Not to refuse me, defender of warriors, Friend-lord of folks, so far have I sought thee, That I may unaided, my earlmen assisting me, This brave-mooded war-band, purify Heorot...
August 30, 2014

Physics
Larry leaves home at 9:03 and runs at constant speed to the lamppost(200 yards from the start). He reaches the lamppost at 9:07, immediately turns, and runs to the tree(1200 yards from the start). Larry arrives at the tree at 9:13. What is Larry’s average velocity, in ...
August 27, 2014

physics
Calculate the wavelength (in m) of a photon capable of exciting an electron in Li2+ from the state n= 3 to the state n=5 1.4239*10^-7 - correct
August 26, 2014

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