Sunday
December 28, 2014

Posts by Alex


Total # Posts: 2,735

physics
The movement of an object or a point mass at a constant speed around a circle that has a fixed radius is called uniform
December 18, 2014

Math
Simplify each expression and state any non-permissible values. (4 marks - show your work) 4x-1 divided by x^2+7x+12 divided by 2x-1 divided by x^2 +x- 12 is the expression Help me please and thank you.
December 18, 2014

Math
Simplify each expression and state any non-permissible values. (4 marks - show your work) x^2-2x divided by x+1 multiplied by x^2-1 divided by x^2+x-6 is the expression
December 18, 2014

This site is the best. Thanks a lot :)
Thanks a lot for everything. Have a great Holidays :)
December 16, 2014

Math
A museum calculates the rate for groups using the equationC=4P+8,where P is the number of people and C is the total cost in dollars. If the cost for a group is $60, how many people are in the group?
December 15, 2014

algebra
1) log sub 8 2 + log sub 8 4x^2 = 1 2) ln 2 - ln (3x + 2) = 1 3) ln (x - 3) - ln (x - 5) = ln 5
December 11, 2014

Math
Courtney and Kurtis are planning to travel 160 km in a car by travelling at x kilometres per hour for the first half of the distance, and then increasing their speed by 10 km/h to finish the distance. Which is the correct simplified expression for the total time of the trip? a...
December 10, 2014

Math
The non-permissible values for the expression -9x+8 divided by -9x^2-55x+56 are? a) x does not equal -8/9 b)x does not equal 8 c) x does not equal 8/9 and x does not equal -7 d) there are no restrictions
December 10, 2014

Math
Express the product, x^2 + 4x divided by 2x^2+13x+15 multiplied by x+5 divided by x^2 - 16 ? a)-1/2x+3 b)x/(2x-16)(x+4) c)(x^2+4x)(x+5) / (2x^2+13x+15)(x^2-16) d)x / (2x+3)(x-4)
December 9, 2014

Math
When fully simplified, ignoring non-permissible values, 12x^12/4x^3 divided by x^8/24x^6? a)72x^3 b)1/72x^7 c)1/72x^3 d)72x^7
December 9, 2014

Math
How would I simplify this quadratic equation: y=-15/20.25(x^2+3x+2.25)+0 This is my work already done the original equation I was given but I need help simplifying the equation I have found.
December 8, 2014

Math
When fully simplified, ignoring non-permissible values, 12x^12/4x^3 divided by x^8/24x^6? a)72x^3 b)1/72x^7 c)1/72x^3 d)72x^7
December 8, 2014

Math
When fully simplified, ignoring non-permissible values, 12x^12/4x^3 divided by x^8/24x^6? a)72x^3 b)1/72x^7 c)1/72x^3 d)72x^7
December 5, 2014

Math
When fully simplified, ignoring non-permissible values,24x^18/6x^3 x x^8/30x^6? a)15/2x^8 b)2/15x^8 c)15/2x^17 d)2/15x^17
December 5, 2014

physics
A blue puck has a velocity of 3i –4j m/s. Its mass is 20 kg. What is its momentum?
December 4, 2014

Math
Express the product x^2+4x/2x^2+13x+15 x x+5/x^2-16 in simplest form. a)- 1/2x+3 b)x/(2x-16)(x+4) c)(x^2+4x)(x+5)/(2x^2+13x+15)(x^2-16) d)x/(2x-3)(x-4)
December 4, 2014

Math
I have got help from Damon on this question but all I need is help on integrating the answer he gave me into my original equation: y=-15/20.25(x+1.5)^2+0 Here's Damon's help: (x+1.5)(x+1.5) = x^2 + 1.5 x + 1.5 x + (1.5*1.5) = x^2 + 3 x + 2.25 So how would I put this ...
December 4, 2014

Math
have got help from Damon on this question but all I need is help on integrating the answer he gave me into my original equation: y=-15/20.25(x+1.5)^2+0 Here's Damon's help: (x+1.5)(x+1.5) = x^2 + 1.5 x + 1.5 x + (1.5*1.5) = x^2 + 3 x + 2.25 So would I put this into my ...
December 4, 2014

Math
a=?,P=5,00,r=2.75,t=10 A=P(1+rt) A=5,000(1+2.75*10) A=5,000(1+27.5) A=5,000(28.5) A=142,500
December 4, 2014

Math
I have got help from Damon on this question but all I need is help on integrating the answer he gave me into my original equation: y=-15/20.25(x+1.5)^2+0 Here's Damon's help: (x+1.5)(x+1.5) = x^2 + 1.5 x + 1.5 x + (1.5*1.5) = x^2 + 3 x + 2.25 So would I put this into ...
December 4, 2014

Math
So then how would I put it into the original equation, Damon?
December 4, 2014

Math
My math teacher said to use the FOIL (First Outer Inner Last) property to simplify these quadratic equations I have made from looking at two parabolas. Here are my equations & how would you use the FOIL property on each of the equations and also can someone help me with ...
December 4, 2014

Math
How would I simplify these two equations I have made up from looking at parabolas: y=-15/20.25(x+1.5)^2+0 y=a(x+2)^2+1.5
December 4, 2014

Science
a ball with a mass of 1.50 kg traveling + 2.00 m/s collides with a stationary ball with a mass of 1.00 kg. After the collision, the velocity of the 1.50 kg ball is + 0.40 m/s. What is the velocity of the 1.00 kg ball after the collision?
December 4, 2014

Chemistry
In the carbon diselenide, CSe2, identify the number of σ and π bonds, the necessary hybridization scheme and the orbital overlap. Thanks
December 3, 2014

physics
a glider with a mass of 5 kg is moving to the right on a horizontal frictionless surface at 6 m/s when it collides with a 8 kg glider that is at rest. After the collision, the 8kg glider is moving to the right at 6 m/s. what are the speed and direction of the 5 kg glider ?
December 3, 2014

chemistry
There are no known stable cyclic compounds with a ring size of seven or less that has an alkyne linkage in the ring. Why?
December 3, 2014

Math
I am 2 digit number The difference between them is less then 1 The sum of them is a multiple of 9 The second digit is a factor of 27 What number am I ?
December 2, 2014

Chemistry
A student dissolves 22.4 g of sodium phosphate to prepare a 2.98 L solution. Another student then dilutes this solution to 4.90 L. If sodium phosphate completely dissociates, determine the number of mols of each ion in the final solution.
December 1, 2014

Physics
A puck (uniform disk) of mass m and radius r is travelingat a speed v on frictionless ice. It strikes a second identical puck a glancing blow (at point P) and sticks to it (using VelcroTM). After the collision, the two-puck-object rotates with angular velocity ω about its...
November 30, 2014

Physics
A child of mass m is playing on a merry-go-round which has mass 6m and radius r. Assume the merry-go-round is a uniform disk. The child is standing on the edge of the merry-go-round, which is spinning with an angular speed ω1. a) What is the moment of inertia, I1, of the ...
November 30, 2014

Physics
A 500.0 g bird is flying horizontally at 2.25 m/s, not paying much attention, when it suddenly flies into a stationary vertical bar, hitting it two-thirds of the way up from the bottom. The bar is uniform and very thin, is 0.750 m long, has a mass of 1.50 kg, and is hinged at ...
November 29, 2014

Math
How would I expand this two quadratic equations and find a & x for both of them? Here are my equations: y=a(x+1.5)^2+0 y=a(x+2)^2+1.5
November 28, 2014

Math
The illumination of an object by a light source is directly proportional to the strength of the source and inversely proportional to the square of the distance from the source. If two light sources, one four times as strong as the other, are placed 11 ft apart, how far away ...
November 28, 2014

Math
A ball is thrown straight up from a bridge over a river and falls into the water. The height, h, in meters, of the ball above the water t seconds after being thrown is approximately modeled by the relation h=-5t^2+10t+35. Can you please help me ! Show your work. a) What is the...
November 26, 2014

Physics
A two dimensional object placed in the xy plane has three forces acting on it: a force of 3N along the x axis acting at a point (3m, 4m); A force of 2N along the y axis acting at (-2, 5m); and a force of 5N in the negative x direction acting at (-2m, -3m). What is the net ...
November 23, 2014

Math
What is the vertex of y=7(x+5)^2+4?
November 21, 2014

physics
A particle of mass and initial velocity strikes a stationary particle of mass . The collision is elastic. It is observed that after the collision the particles have equal and opposite velocities: Find (a) the ratio ; (b) the velocity of the CM (before and after the collision...
November 21, 2014

Math
I also need the other intercept. How would go about figuring it out? Please and thank you, Steve.
November 20, 2014

Math
What are the x-intercepts of y=(x-6)(y-9)?
November 20, 2014

Math
Which function is not quadratic? a)f(x)=x(x-3)(-6x+5) b)f(x)=-6(x-2)^2 c)f(x)=-3x^2+5 d)f(x)=(-6x+3)(1/2x-3)
November 20, 2014

Physics help please
A 0.504 m length of conducting wire carrying a current of 62.1 A is?
November 19, 2014

physics
A lightning strike transfers 25.1 C of charge in (6.49x10^-3) s. The current during this lightning strike is _.__x10^ A?
November 19, 2014

physics
If a person pushes on a block and it travels a distance of 6.0m before stopping. How far would the block travel if it were pushed with the same force, but on the moon(which has 1/6 of the earth's gravity).
November 19, 2014

Math
7/15 divided by 3/10 =
November 19, 2014

Chemistry
Assume you are performing the calibration step of Experiment 8 and you begin with 20 g of water at 20 oC and 20 g of water at 80 oC. After adding the two portions of water into your calorimeter setup and following the procedure outlined in the experiment, you determine the ...
November 17, 2014

Chemistry
if 5.00 ml of 1.66x10^-1 M HCl solution is diluted to exactly 250.0 ml with water, what is the concentration of the resulting solution?
November 16, 2014

calc
Sorry +5
November 13, 2014

calc
verify that g(x)=3x sqrt(x-5) satisfies the condition of rolle's theorem on the interval [0,5]. Find all numbers c that satisfies rolles theorem.
November 13, 2014

Molecular Calculations
if you had 118.7 gm of Sn; how many grams of oxygen would need to convert al the Sn into SnO^2
November 13, 2014

Math
Mike's age, decreased by the age of his 4 year old sister is 11. Mikes age, increased by his uncle's age is 53. How old is Mike's uncle?
November 12, 2014

Physics
A plate falls vertically to the floor and breaks up into three pieces, which slide along the floor. Immediately after the impact, a 200g piece moves along the x-axis with a speed of 2.00m/s and a 235g piece moves along the the y axis with a speed of 1.50m/s. The third piece ...
November 12, 2014

Physics
A plate falls vertically to the floor and breaks up into three pieces, which slide along the floor. Immediately after the impact, a 200g piece moves along the x-axis with a speed of 2.00m/s and a 235g piece moves along the the y axis with a speed of 1.50m/s. The third piece ...
November 9, 2014

Physics
A simple pendulum of length 2.00m is made with a mass of 2.00kg. The mass has speed of 3.00 m/s when the pendulum is 30 degrees above its lowest position. -What is the maximum angle away from the lowest position the pendulum will reach? -What is the speed of the mass when the ...
November 9, 2014

Derivatives
Can you help me find the derivative of this function, I keep messing up of the steps :( f(x)= (x-2)(x^2-3x-1)
November 9, 2014

physical science
Sophia exerts a steady 40-N horizontal force on a 8-kg box resting on a lab bench. The box slides against a horizontal friction force of 24 N. Show that the box accelerates at 2 m/s2.
November 9, 2014

Math Please help
I do not have any Idea how to set this up. Please walk me through the steps. A.) If a customer buys x copies then he or she pays $500 sqrt x. it cost the company $10,000 to develop the program and $2 to manufacture each copy. If a single customer were to buy all the copies of ...
November 6, 2014

Physics
An Escort and a Camaro traveling at right angles collide and stick together. The Escort has a mass of 1200 kg and a speed of 25 km/h in the positive x direction before the collision. The Camaro has a mass of 1700 kg and was traveling in the positive y direction. After the ...
November 6, 2014

Physics
A ball of mass 0.60 kg is fired with velocity 100 m/s into the barrel of a spring gun of mass 2.4 kg initially at rest on a frictionless surface. The ball sticks in the barrel at the point of maximum compression of the spring. No energy is lost to friction. What fraction of ...
November 6, 2014

Physics
A simple pendulum of length 2.00m is made with a mass of 2.00kg. The mass has speed of 3.00 m/s when the pendulum is 30 degrees above its lowest position. -What is the maximum angle away from the lowest position the pendulum will reach? -What is the speed of the mass when the ...
November 5, 2014

Math
Consider the function y = –2(x – 12)^2 + 18. a) What is the axis of symmetry of the graph of the function.(1 mark)
November 5, 2014

math
(-4/5)-6=-14
November 4, 2014

physics
A 1100- kg car collides with a 1500- kg car that was initially at rest at the origin of an x-y coordinate system. After the collision, the lighter car moves at 20.0 km/h in a direction of 35 o with respect to the positive x axis. The heavier car moves at 23 km/h at -50 o with ...
November 4, 2014

Physics
A ball of mass 0.60 kg is fired with velocity 100 m/s into the barrel of a spring gun of mass 2.4 kg initially at rest on a frictionless surface. The ball sticks in the barrel at the point of maximum compression of the spring. No energy is lost to friction. What fraction of ...
November 4, 2014

Physics
A 1100- kg car collides with a 1500- kg car that was initially at rest at the origin of an x-y coordinate system. After the collision, the lighter car moves at 20.0 km/h in a direction of 35 o with respect to the positive x axis. The heavier car moves at 23 km/h at -50 o with ...
November 4, 2014

Math
Explain why (2,-3) would be the vertex of the function y=-3(x-2)^2-3? Please and thank you!
November 4, 2014

Physics
A ball of mass 0.60 kg is fired with velocity 100 m/s into the barrel of a spring gun of mass 2.4 kg initially at rest on a frictionless surface. The ball sticks in the barrel at the point of maximum compression of the spring. No energy is lost to friction. What fraction of ...
November 4, 2014

Physics
A 0.145- kg baseball with an initial speed of 27 m/s rebounds with a speed of 32 m/s after being struck with a bat. If the duration of contact between ball and bat was 1.5 ms, what was the magnitude of the average force between ball and bat?
November 4, 2014

Math
Water spraying from a large fountain follows a path modeled by the function h(d) = -2/3d^2+ 4d, for h > 0, where h is the height of the water above the fountain jet and d is the horizontal distance of the water from the fountain jet, both in metres. a) Graph the function (...
November 3, 2014

Math
I can't remember how you find the roots of quadratic equations other than determining the zeroes of the equation and finding the x-intercepts. Can someone please give me a clear answer on this as my dad has been useless on this topic and I need help like ASAP! You can find...
November 3, 2014

Math
Water spraying from a large fountain follows a path modelled by the function h(d) = sa001-1.jpgd2 + 4d, for h ³ 0, where h is the height of the water above the fountain jet and d is the horizontal distance of the water from the fountain jet, both in Water spraying from a ...
November 3, 2014

Math
I can't seem remember the rules for this.Can someone please help me with the following questions? You can find the roots of a quadratic equation by determining the zeros of the quadratic function or the ...? You can find the roots of a quadratic equation by determining the...
November 3, 2014

Math
(x+4)(x-9)=0 I need help because I have tried all the answers as this a multiple choice question. a) (x+4)(x-9) (4+4)(-9-9) (8)(-18) -144 b) (x+4)(x-9) (4+4)(9-9) (8)(0) 0 c) (x+4)(x-9) (-4+4)(9-9) (-8)(0) 0 d) (x+4)(x-9) (-4+4)(-9-9) (0)(-18) 0
November 3, 2014

Math
Where did you get the 1 + 2 square root 2 for the answer? Please explain more thoroughly for the answer and how you got it.
November 3, 2014

Math
A ball is thrown straight up from a bridge over a river and falls into the water. The height, h, in meters, of the ball above the water t seconds after being thrown is approximately modeled by the relation h=-5t^2+10t+35. c) After how many seconds does the ball hit the water?
November 3, 2014

Calculus
Using an appropriate linear approximation approximate 26.9^(4/3).
October 31, 2014

Solving inequalities
I've had so much trouble so much trouble with this if somebody could help me I would be so grateful g + 3 > 6
October 31, 2014

Math
Solve the quadratic function y=2x^2-14x -16 by completing the square. Round roots to the nearest hundredth, if necessary. Show your work.
October 30, 2014

stats
A company wishes to make 1 ounce candy bars. According to government regulations, in order to label the candy bars as 1 ounce, at least 95 % of the bars must weigh 1 ounce or more. Our process standard deviation is .08 ounces. What do we need to make the mean weight be so that...
October 29, 2014

Math
Solve (x+4)(x-9)=0
October 29, 2014

Math
A projectile is shot vertically into the air. Its height, h, in metres, after t seconds is approximately modelled by the relation h=-5t^2+120t+125: c) For how many seconds is the projectile in the air? (1 mark)
October 29, 2014

Calculus
New York state income tax is based on taxable income which is part of a person's total income. The tax owed to the state is calculated using taxable income (not total income). In 2005, for a single person with a taxable income between $20,000 and $100,000, the tax owed ...
October 29, 2014

Math
The value of k that makes the expression x^2 + 72x +k a perfect square trinomial is ?
October 28, 2014

math please help
Custom Kitchens received an invoice dated November 17 from Idea Cabinets Ltd. for $7260 with terms 3/15, 15/30,n/60. If Custom Kitchens made a payment of $4000 on December 2, what further payment on December 16 will settle the account?
October 27, 2014

Math invoice
Custom Kitchens received an invoice dated November 17 from Idea Cabinets Ltd. for $7260 with terms 3/15, 15/30,n/60. If Custom Kitchens made a payment of $4000 on December 2, what further payment on December 16 will settle the account?
October 27, 2014

Math
Custom Kitchens received an invoice dated November 17 from Idea Cabinets Ltd. for $7260 with terms 3/15, 15/30,n/60. If Custom Kitchens made a payment of $4000 on December 2, what further payment on December 16 will settle the account?
October 27, 2014

Physics
A block of mass m1 = 41.3 kg on a horizontal surface is connected to a mass m2 = 13.2 kg that hangs vertically as shown in the figure below. The two blocks are connected by a string of negligible mass passing over a frictionless pulley. Assume that the horizontal surface is ...
October 27, 2014

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

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