Saturday
December 20, 2014

Posts by Colin


Total # Posts: 100

math
sam makes $400 per week plus $20 commission on each new cell phone plan she sells. Write an equation to determine how many plans she sold to earn $680 last week.
October 20, 2014

Physics
A boat beguins on the best side of a river and heads straight east across the river with a speed of 1.9 Ft/s (relative to the water). the river water flows NORTH at the speed of 2.^ Ft/s (relative to the shore). The resultant veliocty of the boat ( relative to the shore) is ...
October 8, 2014

physics
At t = 0, an automobile traveling north begins to make a turn. It follows one-quarter of the arc of a circle of radius 10.1 m until, at t = 1.64 s, it is traveling east. The car does not alter its speed during the turn. (a) Find the car's speed. (b) Find the change in its ...
January 28, 2014

Magnetism
A circular wire loop of mass M and radius R carries a current I. It hangs from a hinge that allows it to swing in the direction perpendicular to the plane of the loop. A uniform magnetic field B exists everywhere in space pointing upwards. What angle θ does the plane of ...
December 18, 2013

magnetis
A metal spring can be used as a solenoid. The spring is stretched slightly, and a current is passed through it. The resulting magnetic field will cause the spring to a. collapse (shorten) b. stretch (lengthen) c. not change (nothing happens) d. ranslate along the current ...
December 18, 2013

magnetism
A charged particle with charge q is moving with speed v perpendicular to a uniform magnetic field. A second identical charged particle is moving with speed 2v perpendiculuar to the same magnetic field. The time to complete one full circular revolution for the first particle is...
December 18, 2013

PHYSICS
work out the velocity from right hand rule. Remember what current means in terms of conventional current.
December 17, 2013

electricity and magnets
Think about conventional current.
December 17, 2013

magneismt
what statements?
December 17, 2013

Physics
not yet
December 16, 2013

Physics
So did this work out Lora?
December 16, 2013

PHYSICS
That seems really small.
December 15, 2013

PHYSICS
whats h? is that the height 10 cm?
December 15, 2013

PHYSICS
There are two things in life, physics and everything else is stamp collecting.
December 4, 2013

Magnetic effect
Use kinematic equations for 1. Then you can work out the radius. For 2 what is the equation for potential energy of a magnetic field?
November 25, 2013

science
You have a pulley 13.9 cm in diameter and with a mass of 1.7 kg. You get to wondering whether the pulley is uniform. That is, is the mass evenly distributed, or is it concentrated toward the center or the rim? To find out, you hang the pulley on a hook, wrap a string around it...
October 22, 2013

Chemistry
2 moles of helium (He) are pumped from a gas canister into a weather balloon. The balloon at this point has a volume V1. 1 mole of nitrogen gas (N2) is added at the same temperature and pressure. The volume of the balloon changes to V2. How will the new volume of the balloon ...
April 17, 2013

AP CHEM HELP
When NH3 is added to solid Hg2Cl2, some of the mercury ions are oxidized and some are reduced. A reaction where the same substance is both oxidized and reduced is called a disproportionation reaction. Write equations for each of these half-reactions. HELP
April 9, 2013

algebra 1
just like normal equations
April 9, 2013

physical science
two cars 200meters apart drive towards one another. If one car travels at 12 meters/s and the other at 26 meters/s how long does it take for them to collide?
April 7, 2013

10 grade algebra
10(x+5)=130 x+5=130/10 x+5=13 x=13-5 x=8
March 26, 2013

Maths
I divide exactly by 100 my first two digits are equal the sum of my four digits is 8
February 25, 2013

Chemistry
2.00x10^-3
February 19, 2013

Physics
Vector A has a magnitude of 5.00 units, vector has a magnitude of 5.00 units, and the dot product A·B has a value of 16. What is the angle between the directions of A and ?
January 20, 2013

math
if 400 customers come to a grand opening and every 5th customers receives a coupon for jeans and every 7th customers receives a coupon for a free sweater. how many customers will leave with both
November 1, 2012

AP Chem
(MnO40- + (C2O4)2- + H+ = CO2 + H2O + ? OR (MnO4)- + (C2O4)2-+ OH-=CO2 n+ H2O +? Can somebody please help me predict the products? I can balance it i just need help determining what to balance.
October 23, 2012

Physics
a driver sees a horse on the road and applies the brakes so hard that they lock and the car skids to a stop in 24 m. the road is level and the coefficient of kinetic friction between the tires and the road is 0.7. How fast was the car going when the brakes were applied?
October 23, 2012

AP Chemistry
thank you that was the only one that i couldn't get. that and number 7. im a little confused on how somebody could do that?
October 17, 2012

AP Chemistry
The Synthesis of an Iron Oxalato Complex Salt (“Green Crystals”) In this experiment you will synthesize a compound that will contain the elements potassium, iron, carbon, hydrogen, and oxygen. Carbon and oxygen will be present in the compound as oxalate (C2O4-2) ...
October 17, 2012

math
The height, h(t), of a projectile, in metres, can be modelled by the equation h(t) = 14t – 5t2, where t is the time in seconds after the projectile is released. Can the projectile ever reach a height of 9m? Explain.
October 14, 2012

Math
We are having an issue trying to solve for purple...
September 12, 2012

Math
A toy train has 20 cars- blue, purple and orange. There are 4 times as many blue cars as purple cars. There are 5 times as many orange cars as purple cars. How many of each color are there?
September 12, 2012

maths
Marie can afford a $250 per month car payment. She’s found a 5 year loan at 7% interest. a. How expensive of a car can she afford? b. How much total money will she pay the loan company? c. How much of that money is interest?
July 18, 2012

maths
How much money will I need to have at retirement so I can withdraw $60,000 a year for 20 years from an account earning 8% compounded annually? a. How much do you need in your account at the beginning b. How much total money will you pull out of the account? c. How much of that...
July 18, 2012

maths
You deposit $1000 each year into an account earning 8% compounded annually. a. How much will you have in the account in 10 years? b. How much total money will you put into the account? c. How much total interest will you earn?
July 18, 2012

maths
How much would you need to deposit in an account now in order to have $20,000 in the account in 4 years? Assume the account earns 5% interest.
July 18, 2012

Maths
How do yo calculate a number to the power of 2.08 i.e. not a whole number. so 4 to the power of 2.08 Thanks.
May 11, 2012

chemistry
The mole fraction of an aqueous solution of magnesium chlorate is 0.371. Calculate the molarity (in mol/L) of the magnesium chlorate solution, if the density of the solution is 1.39 g mL-1.
February 28, 2012

chemistry
calculate the pH of 20.00mL of 2.00 M HCl diluted to 0.500 L
February 26, 2012

Chemistry
The equilibrium constant for the reaction: 2NO(g)+Br2(g)<==>2NOBr(g) Kc=1.3x10^-2 at 1000 Kelvin Calculate Kc for: NOBr(g)<==>NO(g)+ 1/2Br2(g)
February 26, 2012

Chemistry
Calculate the [OH-] for a solution in which [H+] is 1000 times greater than [OH-]? and will the final result be acidic, basic, or neutral?
February 25, 2012

Chemistry
assuming complete dissociation of the solute, how many grams of KNO3 must be added to 275 mL of water to produce a solution that freezes at -14.5 C? The freezing point for pure water is 0.0 C and is equal to 1.86 C/m .
January 27, 2012

geometry
Eg if EF=13cm
January 20, 2012

AP Physics
m1= mass of the bullet m2= mass of the block Vf=sqrt(2gh) v1= initial velocity of bullet v2= initial velocity of the block = 0 so first is conservation of momentum m1v1+m2v2=(m1+v2)Vf solve for v1 (note m2v2=0) v1=((m1+m2)/m2)/Vf to find Vf look at conservation of energy KE+PE...
December 5, 2011

math
thx
November 21, 2011

math
whats 17.50x30
November 21, 2011

chemistry
In the following experiment, a coffee-cup calorimeter containing 100 mL of H20 is used. The initial temperature of the calorimeter is 23.0 C . If 3.60 g of CaCl2is added to the calorimeter, what will be the final temperature of the solution in the calorimeter? The heat of the ...
October 20, 2011

chemistry
the molarity of a solution composed of 25.4g KHCO3 diluted with water to a total volume of 200 mL
October 18, 2011

chemistry
A solution of .12 L of 0.160 M KOH is mixed with a solution of .3 L of 0.230 M NiSO4. the equation for this reaction is: 2KOH (aq)+NiSO4 (aq) ----->K2SO4 (aq)+Ni(OH)2 (s) .89 grams of Ni(OH)2 precipitate form I need to know the concentration remaining in the solution of: 1...
October 14, 2011

Chemistry 101
A solution of .12 L of 0.160 M KOH is mixed with a solution of .3 L of 0.230 M NiSO4. the equation for this reaction is: 2KOH (aq)+NiSO4 (aq) ----->K2SO4 (aq)+Ni(OH)2 (s) .89 grams of Ni(OH)2 precipitate form I need to know the concentration remaining in the solution of: 1...
October 14, 2011

chemistry
A scientist wants to make a solution of tribasic sodium phosphate, Na3PO4, for a laboratory experiment. How many grams of Na3PO4 will be needed to produce 400 mL of a solution that has a concentration of Na+ ions of 1.00 M?
October 13, 2011

math
Find the slope of the line passing through the points A(-4, 3) and B(4, 2)
August 30, 2011

science
what dose porosity mean?
June 5, 2011

CHEMISTRY URGENT!!!
Determine the pH (to two decimal places) of the solution that is produced by mixing 30.3 mL of 1.00×10-4 M HBr with 829 mL of 5.77×10-4 M Ca(OH)2.
March 23, 2011

Chemistry
A mixture containing CH3OH, HF, CH3F, and H2O, all at an initial partial pressure of 1.04 atm, is allowed to achieve equilibrium according to the equation below. At equilibrium, the partial pressure of H2O is observed to have increased by 0.43 atm. Determine Kp for this ...
March 9, 2011

Chemistry
Determine the volume (in mL) of 0.844 M hydrochloric acid (HCl) that must be added to 38.0 mL of 0.650 M sodium hydrogen phosphate (Na2HPO4) to yield a pH of 6.92. Assume the 5% approximation is valid and report your answer to 3 significant figures. Look up pKa values.
March 9, 2011

algebra
9x-12 = 78 (add 12 to both sides) 9x-12+12 = 78+12 (divide by 9 to isolate x) 9x=90 9x/9 = 90/9 x = 10 Check * 9(10) - 12 = 78 (9 x 10) - 12 = 78 90 - 12 = 78 78 = 78
March 2, 2011

Chemistry
Determine the molarity (in mol/L) of NO2− ions in solution when 9.77×101 g of sodium nitrite is added to enough water to prepare 3.94×102 mL of the solution.
March 2, 2011

Physics II
Jose, whose mass is 75 kg, has just completed his first bungee jump and is now bouncing up and down at the end of the cord. His oscillations have an initial amplitude of 11.0 m and a period of 4.0 s. From what height above the lowest point did Jose jump? k=185 n/m Vmax = 17 m/s
March 1, 2011

chemistry
The mole fraction of an aqueous solution of sodium dichromate is 0.367. Calculate the molarity (in mol/L) of the sodium dichromate solution, if the density of the solution is 1.42 g mL-1.
February 25, 2011

Chemistry
chemistry question. How many grams of silver sulfide can be produced by heating 45 grams of silver excess sulfer?
January 9, 2011

physics
A roller coaster at an amusement park has a dip that bottoms out in a vertical circle of radius r. A passenger feels the seat of the car pushing upward on her with a force equal to 2.6 times her weight as she goes through the dip. If r = 20.0 m, how fast is the roller coaster ...
November 23, 2010

physics
a 5-kg crate is resting on a horizontal plank. the coefficient of static friction is .5 and the coefficient of kinetic friction is .4. after one end of the plank is raised so the plank makes an angle of 25 degrees with the horizontal, the force of friction is?
October 26, 2010

3rd grade
array for 5 times 1
September 7, 2010

math
we have a problem that my parents cant help with. 846*2=(...+40+...)*2=(800 over ...+...over2+6 over...)=(400+...+3)...=... ...means blank space for a number. Can you help with this problem, so that I can figure out the rest of the problems.Thanks
August 31, 2010

5th grade
how do you break apart to divide: 648 by 6 using compatible numbers to break apart the dividend.
August 31, 2010

english
what about The Story of My Life
June 3, 2010

Music
I need a new written add on verse of bob dylan chimes of freedom song has to be 8 lines long and the last line is An' we gazed upon the chimes of freedom flashing.
May 29, 2010

algebra
Its this symbol^ the computer on our webassign online doesn't recognize it so we need to replace that symbol^with a number so thats where I am lost
February 23, 2010

algebra
Need help showing me the steps without using the carrot function: Find the product. (2y + 2z)(2y - 3z)
February 23, 2010

Math
The area A of a triangle is given by the formula A=1/2bh If the base of the triangle with height 12 inches is doubled, its area will be increased by 48 square inches. Find the base of the orignial triangle.
February 10, 2010

Math
The area A of a triangle is given by the formula A=1/2bh If the base of the triangle with height 12 inches is doubled, its area will be increased by 48 square inches. Find the base of the orignial triangle.
February 10, 2010

Gr.7 - math
4. The dimensions of a king-size waterbed are 2.1m, 1.8m, and 23 cm. Find the volume and mass of the water it contains when full.
January 5, 2010

7th grade
5. What is the mass of the water? a. that fills a 1m^3 tank b. that fills a 2L bottle c. that would fill you empty classroom Thanks for your help!
January 5, 2010

Literature
I think your essay was good,but in the first paragraph you said "Throughout the year, the children that couldn’t afford designer clothes were made fun of constantly for their attire. Keeping up with the latest fashion trends was a must in our busy school and whoever ...
December 28, 2009

Reading
What is the definition of the word embers?
October 21, 2009

science
what is a ernmeyer flask and a granulated cylander used for?
September 27, 2009

Friedman test: Can !?
I have 28 participants. Each completed five tests. The maximum score a participant could receive on any one test was 4/4. The lowest score anyone could receive was zero. I will do a Friedman test for this paired data. My question: given that I have a very large number of ...
August 13, 2009

English
Thanks very much Bob. I much appreciate your taking the trouble to respond. All the best! Colin
August 13, 2009

English
I have 28 participants. Each completed five tests. The maximum score a participant could receive on any one test was 4/4. The lowest score anyone could receive was zero. I will do a Friedman test for this paired data. My question: given that I have a very large number of ...
August 13, 2009

Geography
Why is it drifting farther away
November 15, 2008

Geography
What is happening to the distance between Canada and europe
November 15, 2008

Geography
What is happening to the distance between Canada and Europe? Which plates meet near the west coast of Canada? In whihc direction are they moving?
November 13, 2008

Geography
Thank you
November 13, 2008

Geography
Name the five largest plates and on which plate Canada is located?
November 13, 2008

10th grade
Whatis the difference between the Hudson Bay Lowlands and the Arctic Lowlands?
November 12, 2008

science
potential energy is energy of _______ or chemistry?
November 6, 2008

math
what is the gcf of 24,32
November 5, 2008

Physics
a 10kg table needs to be pushed across the floor (µ=3). u stand behind it and push it at an anjgle of 30 degrees down with a force of 60N. wats the acceleration of the table?
April 7, 2008

Algebra (word problems)
thank u
December 12, 2007

Algebra (word problems)
dude i did my own effort. the problem is i dont know what im doing with these. i missed class cuz i was sick but if i can get the answers or if you would be so kind as to take the time to explain to me how to do a problem of 2 that would be great. id give u what i have but i ...
December 12, 2007

Algebra (word problems)
1) a small pipe can fill a tank in 16 min more time than it takes a large pipe to fill the same tank. Working together, both pipes can fill the tank in 6 min. How long would it take each pipe working alone to fill the tank? 2) a car travels 240 mi. a second car, travelling 12 ...
December 12, 2007

Algebra
Okay i have a few function questions im gonna post. Im completely confused with these so any help would be great. Minimum or maximum value of: f(x)=2x^2+4x+1 and f(x)=x^2-3x+2 then if f(x)=x^2+9 and g(x)=x-4, find (g*f)(-3) next is if f(x)=x^3+x^2-x-1 and g(x)=x+1, find (f/g)(...
December 12, 2007

science
What is the ratio of sulfur atoms to oxygen atoms in SO2?
November 17, 2007

algebra
simplify (numbers AFTER the variable represent exponents) ALSO these are all fractions, theres just no way to put the line x2-64 . x2-x-6 _ 1 x2-4x-12 x2+5x-24 x-6
October 15, 2007

Algebra
a cessna can fly at a rate of 220 mph in calm air. traveling with the wind, the cessna flew 780 mi in the same amount of time as it flew 540 mi against the wind. find the rate of the wind. how do i set this problem up? please explain in detail cuz i dont get these word ...
October 15, 2007

Algebra
an amtrak trainand a car leave new york city at 2 PM and head for a town 300 miles away. the rate of the amtrak train is 1 1/2 times the rate of the car. the train arrives 2h ahead of the car, find the rate of the car
October 15, 2007

pigskin geography
where are the answers
September 19, 2007

pigskin geography
i hate pigskin geography
September 19, 2007

Physics
I know how to get the speed if it accelerated the whole time. How do I calculate the cruising speed? Starting from rest, a car travels 1,350 meters in 1 min. It accelerated at 1 m/s^2 until it reached its cruising speed. Then it drove the remaining distance at constant ...
September 7, 2007

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