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Posts by dan

Total # Posts: 1,188

physics
Sam tosses a ball horizontally off a footbridge at 3.2 m/s. How much time passes after he releases it until its speed doubles?

Math
could you please solve the problem completely .. i am still confused. Thanks.

Math
Given [(x-5)/(x-3)]^2 . Find any stationary points and any points of inflection. Also find any horizontal and vertical asymptotes.

Math
Given y = x^4 − 4x^2 + 50. Find any extrema and any points of inflection

Calculus 1
Given y = x^4 − 4x^2 + 50. Find any extrema and any points of inflection

Math
how did you get x to equal 400

Math
to identical jars are filled with equal amount of marbles. the marbles are coloured red or white. the ratio of red to white marblesis 7:1 in jar 1 and 9:1 in jar 2. if there are 90 white marbles altogether, determine the number of red marbles in jar 2.

Physics
f = ma u(k) * f(normal) = m*a u(k) *m*g=m*a u(k) *g =a a = 0.10 * 9.81m/s^2 = 0.981 m/s^2 this is defined to be a negative acceleration v = u + a*t so t = (v-u)/a and x = t * (v+u)/2 so together x = (v+u)(v-u)/2a where x = distance, v = final speed, u = initial speed, t = time...

Chemistry
How many grams of iron can be produced of 156000 calories of heat are absorbed by a large enough sample of iron III oxide

Calc
express 3ln(r)- 5ln(s)+ 7ln (t) as a single logarithm.

chemistry - chromatography
We used three different color dyes in both alcohol and water. So its the chemical makeup of each color that determines the Rf value?

chemistry - chromatography
Hello, can you tell me why different colors have different rf values

Basic Electronics
discuss your thoughts on the use of thevenin equivalent circuit.

Physics
The displacement from the equilibrium caused by a wave on a string is given by: y(x,t) = (-0.00200 m)sin[(40m^-1)x-(800s^-1)t]. What is the number of waves in 1 m?

Physics
Suppose a monatomic ideal gas is changed from state A to state D by one of the processes shown on the PV diagram. Find the total work done on the gas if it follows the constant temperature path A-C followed by the constant pressure path C-D. A = 2atm and 4L C = 1atm and 8L D...

physics
A town is planning on using the water flowing through a river at a rate of 5.0X10^6 kg/s to carry away the heat from a new power plant. Environmental studies indicate that the temperature of the river should only increase by 0.50ºC. The maximum design efficiency for this ...

chemistry
CuCl --> Cu+ & Cl- Ksp = [Cu+2] [Cl-] ========================= Cu+(aq) + 2 Cl ‾(aq) ==> CuCl2 ‾(aq) K = [CuCl2 ‾] / [Cu+2] [Cl-]^2 =============== (K) (Ksp) = [Cu+2] [Cl-] times [CuCl2 ‾] / [Cu+2] [Cl-]^2 reduces to: (K) (Ksp) = [CuCl2 ‾...

chemistry
Find out: a) How many grams of lithium are required? b) How many grams of each product can be produced?

Math
the rule is this: A prime can be written as a sum of two squares. I hope that helps

com155
ok I got it now.. thank you very much!!

com155
The role of education plays a big part in financial planning (PRESENT). It has worked a crucial part of becoming successful with your money (PRESENT PERFECT TENSE). It will help you in learning basic math skills in order to better your finances (FUTURE TENSE). The whole idea ...

com155
Okay! I hope this is it. The role of education plays a big part in financial planning (PRESENT). It has worked a crucial part of becoming successful with your money (PAST). It will help you in learning basic math skills in order to better your finances (FUTURE TENSE). The ...

com155
OK! I will try going over the site you sent me and try again.. Thanks a lot!

com155
HOW ABOUT THIS? The role of education plays a big part in financial planning (PRESENT). It has been a crucial part of becoming successful with your money (PAST PREFECT TENSE). It will help you in learning basic math skills in order to better your finances (FUTURE TENSE). The ...

com155
OH! Thank you! I did not know it said that. I am having trouble understanding it. thank you! So, does that mean I have to start all over? Did I at least get all the verbs right?

com155
Write five sentences about the role of education in successful financial planning, in which you correctly use a different verb tense in each sentence. Mark each verb used in bold and, in parentheses, identify the specific tense used The role of education plays a big part in ...

English 101
MARVELOUS 1. extraordinarily good; used especially as intensifiers 2. too improbable to admit of belief 3. being or having the character of a miracle UNCANNY of a strange nature; weird; mysterious Example That two people could be so alike was uncanny.

com155
thank you

com155
Yes! That is what I am trying to figure out.

com155
Write five sentences about the role of education in successful financial planning, in which you correctly use a different verb tense in each sentence. Mark each verb used in bold and, in parentheses, identify the specific tense used. THIS IS WHAT I WROTE: The role of education...

physics
thanks, I see where I messed up at...

physics
The Cedar Bluff express KAT bus averages 15 mph for 20 minutes, and then 32 mph for 14 minutes. What was its average speed? (mph)

physics
Suppose that you measured the moment of inertia of the system as I = 5.05 kg-m2. Assume the diameter of the pulley around which you wrap the string is d = 2.5 cm. a) suppose the system is initially spinning at angular speed ωo = 2.05 rad/s. After you drop a cube of mass ...

Calculus
i still did not understand. if u don't mind could you please explain it again and also the question asks for the intervals and the points. could you give the intervals and points for the the questions above in the questions .. Thanks a bunch :).

Calculus
Find: (a) the interval(s) on which f is increasing, (b) the interval(s) on which f is decreasing, (c) the open interval(s) on which f is concave up, (d) the open interval(s) on which f is concave down, and (e) the X-coordinate(s) of any/all inflection point(s). f(x)= (x^4) - (...

calculus
A cone of radius r centimeters and height h centimeters is lowered point first in at a rate of 1 cm/s into a tall cylinder of radius R centimeters that is partially filled with water. How fast is the water level rising at instant the cone is completely submerged?

Math
Solve: x'=x+y+2t y'=x+y-2t

physics
80cm=0.8m T=25/14=1.786...seconds v=(2pi*r)/T=2pi(0.8)/1.786...=2.815...m/s a=v^2/r=2.815...^2/0.8=9.904m/s^2, towards the centre along the radius vector of the circle

math
The first angle of a triangle is 24 more than the second. The third angle is twice the first. Find the measure of the angle of the triangle.

Physics Spring
A mass sitting on a horizontal, frictionless surface is attached to one end of a spring; the other end is fixed to a wall. 1.0 J of work is required to compress the spring by 0.12 m. If the mass is released from rest with the spring compressed, it experiences a maximum ...

physics please help
The femur is a bone in the leg whose minimum cross-sectional area is about 3.60 10-4 m2. A compressional force in excess of 6.90 104 N will fracture this bone. (a) Find the maximum stress that this bone can withstand. (b) What is the strain that exists under a maximum-stress ...

Flec
what is a prime factor? How do I find the prime factor?

physics help
i don't get this either please help me thanks.

physics please help me
i understand but how to i go about solving this that's what i need help in, if that assumption is made.

physics please help me
A 5.00 kg ball (ball 1), moving to the right at a velocity of +4.00 m/s on a frictionless table, collides head-on with a stationary 7.60 kg ball (ball 2). Find the final velocities of the balls if the collision is as specified below. (a) elastic collision ball 1 = -.825 ball 2...

physics please help me
The pole vault landing pad at an Olympic competition contains what is essentially a bag of air that compresses from its "resting" height of 1.1 m down to 0.1 m as the vaulter is slowed to a stop. (a) What is the time interval during which a vaulter who has just ...

chemistry
0.45

Calculus
P(x)= -x^3+15x^2-48x+450, x>/3 is an approximation to the total profit (in thousands of dollars) from the sale of x hundred thousand tires. find the number of hundred thousands of tires that must be sold to maximize profit.

Calculus
find the absolute extrema if they exist as well as where they occur f(x)= x-1/x^2+3x+5

Calculus
Find all extrema, inflection points, and asymptotes where applicable f(x)= 2x^3-12x^2+18x I got 0, 8 for extrema 2, 0 for I.P and I don't know how to find asymptotes

Calculus
Find the indicated absolute extremum as well as all values of x where it occurs on the specified domain f(x)= x^2e^-0.25x ; [3,10]

Math please help!
x=speed of boat in still water. assuming the problem implies 26 miles each way. to figure this out, I wrote this out in simple miles per hour terms. Example: (hours/mile)*miles + (hours/mile)*miles = hours so: (1/(x+5))*26+(1/(x-5))*26=10.6 x+5 represents the speed of the boat...

chem need assistance
Write a balanced chemical reaction to show the reaction between ammonium and a chlorite? Is this correct? 2NH3 + CLO2 + H2O ⇒ NH4Cl + NH2O2

chem
complete this reaction 2 NaNO3 + ht →

chem
Complete the reaction? IF no reaction say so H2O C4H6O3 ====> H2O c) Cu ===== > H2O d) K2O=====> e) 2 NaNO3 + ht →

HELPPPPP
so im done with everything except fro this question : A(n) 2.3 kg object moving with a speed of 8.6 m/s collides with a(n) 4 kg object moving with a velocity of 8.8 m/s in a direction39.0135◦ from the initial direction of motion mof the 2.3 kg object.What is the speed of...

Chemistry
Determine the mass of zinc sulphide,ZnS which is produced when 6.2 g of zinc and 4.5 g of sulphur are reacted. This question is really confusing me, and I'm not sure where to start. I think I have to calculate the moles of each given reactant first in which case I have: ...

Chemistry
Determine the mass of zinc sulphide,ZnS which is produced when 6.2 g of zinc and 4.5 g of sulphur are reacted.

Chemistry
I'm not understanding. what do you mean figure the moles of H2O2 in 3.4 g of water? You get the same number of moles of water? I calculated: nH2O2 = 3.4g/34.02g/mol= 0.0999412 mol Water on the other hand has 18.02 mol sorry but I'm not understanding. I think for this ...

algebra
two planes take off from an airport at the same time and head in opposite directions at 260 mph and 275 mph respectively. in how many hours will they be 1605 miles apart?

chemistry
Suppose you put 50mL of water in the can instead of 100mL and heated it to 40 degrees instead of 20 degrees. In what ways, if any, would this afect the results of the experiment? What would happen if you used 200mL of water and heated it only 10 degrees? Can you think of any ...

College Physics
A car starts from rest on a curve with a radius of 150 m and accelerates at 1.50 m/s^2. How many revolutions will the car have gone through when the magnitude of its total acceleration is 3.20 m/s^2 ?

College Chem
How many liters of carbon dioxide at 20 oC and 750 torr are produced when one gallon of toluene is burned? Convert liters to milliliters and then to grams. can you convert mil to grams?

Chemistry
1 gallon toluene = about 3,785 mL density = about 0.867 g/mL mass toluene = 3785 mL x 0.867 g/mL = 3282 grams. C7H8 + 9O2 ==> 7CO2 + 4H2O moles toluene = grams/molar mass = 3282/92 = about 36 moles. From the equation above, 1 mole C7H8 will produce 7 moles CO2; therefore, ...

Chemistry
can't convert ml to grams

Chemistry
How many liters of carbon dioxide at 20 oC and 750 torr are produced when one gallon of toluene is burned

chemistry
How much heat is released when one gram of toluene burned?

Physics
f = ma μk * f(normal) = m*a μk *m*g = m*a μk *g =a so a = μk*g this is defined to be a negative acceleration since the friction force works in the opposite direction to the movement of the puck vFinal = v0 + at so t = (vF-v0)/a d = t*(vF+v0)/2 so d = (vF+v0...

German
Actually, it is "Mein Name ist ... " or better and not as awkward (as being the correct German phrase) "Ich heiße ...".

calculus
Use the four-step process to find the slope of the tangent line to the graph of the given function at any point. (Simplify your answers completely.) f(x) = 2x^2 + 7x

11th grade
18.26

Astronomy and Space
Using a telescope, which planets acn be observed from Earth in a crescent moon phase?

chem2
If you have an insulated glass of water at 25 oC containing 10 fluid oz at 25 oC, how much ice would you have to add to end up with a final temperature of 0 oC and no ice left?

chem
If this sample of dry ice were to be placed in an evacuated 1.0 L container and allowed to come to room temperature (25 oC), what would the pressure be?

chem
would you see a decrease in volume

chem
If ice were to be placed in a container at a temperature of -2 oC, with a water vapor pressure of 2 torr, you would see a decrease in the volume of solid ice over time.

chem
283.5 x .5 + 10 x 1 X (X)=0

chem
If you have an insulated glass of water at 25 oC containing 10 fluid oz at 25 oC, how much ice would you have to add to end up with a final temperature of 0 oC and no ice left?

Physical Science
.In the early 1900s, two associates of New Zealander Ernest Rutherford bombarded thin sheets of gold with positively charged subatomic particles. They found that most of the particles passed right through the sheets but some bounced back as if they had hit something solid. ...

math
You are offered two different sales jobs. The first company offers a straight commission of 4% of the sales. The second company offers a salary of $ 500 per week plus 2% of the sales. How much would you have to sell in a week in order for the straight commission to be equal to...

Accounting
HOW DO I find the net icome for this company with this information? Beginning of the year: ASSETS WERE $810,000 lIABILTES WERE:$324,000 eND OF YEAR: aSSETS WERE: $1,296,000 AND lIABILTES WERE:$540,000. cAPITAL STOCK OF $162,000 WAS ISSUSED dIVIDENDS OF $72,OOO WERE PAID

accounting
How do I find the net income for this company ,with this information? Beginning of year Total Assets were:$810,000 Total liabilites were:$324,000 End of year Total Assets were:$1,296,000 Total liabiltes were:$540,00 Capital stock of $162,000 was issued dividends of $72,000were...

algebra 2
I'm stuck on this one: factoring polynomials from algebraic expressions (and it says you can use the substitution method): 3m^2(2p^2+3)over (x^2+y)(2x-y^2) minus 6m(2p^2+3)over (y^2-x)(2x-y^2)= Do I find the GCF? I get 3m(m-2) over (x^2+y)(2x-y)(y^2-x) ????

algebra 2
I'm stuck on this one problem. The directions say: Solve the following leaving the sq. rt. in it's simplest form: sq.rt of 33+ sq.rt of 96 - sq.rt of 3 = I think it can't be simplifed---am I correct? (the directions did say that some of the problems can't be ...

xacc 280
Post one or two new concepts you learned from each of the PhxKlips

Physics
It took a stopping train 41/4min to travel between two stations 11.2km apart.The train accelerated uniformly during the first 11/4min of the journey,and decelerated uniformly to rest during the last 3/2min of the journey.The train had moved with uniform speed during the ...

Mec 123
A flywheel rotating at 5.3 revolutions per second has an angular retardation of 4/5 radian per second per minute.calculate:(i)its angular velocity after 45 seconds(ii),the number of revolutions it makes in 1 minute, and in coming to rest.

math
Show that x^2+y^2-6x+4y+2=0 and x^2+y^2+8x+2y-22=0 are orthogonal.

German
Yup. Some English here, please :) ... Would help a lot.

college
You're thinking of investing in a automation project to reduce cost of production. -Investment in Fixed Assets: $900,000 at t=0; salvage value of $300,000 at t=6; straight line deprectiation over 6 years (assume book value is 0 at t=6) -Investement in NWC: $250,000 at t=0...

geometry
A spherical water tank has a diameter of 10 feet. How much water does it hold when half full (use 3.14 for , and round to the nearest hundredth)?

trig
X=38.21

Fracture Math word
Dig

Chemistry
Is 20.0 mL of 3.0 M HF a buffer solution with an approximate pH of 3?

Chemistry
What is the molar solubility of silver sulfide, Ag2S? (Ksp for Ag2S is 6.0 x 10^51.)

chemistry
what volume would 8g of He at.951 atm and 25c occupy?

algebra-is this right
A basketball player has a vertical leap of about 36 in. If the equation d=48t^2 describes his hang time t as a function of his vertical leap d. what is his hang time? Show your work. 36=48t^2 t^2=3/4 t=(1/2)sqrt(3)seconds

algebra
Thank you for your help and reminding me there is two answers.

algebra
I was wondering if my answer is right. Let f (x)=(x+10)^2. Find x so that f(x)=72 (x+10)^2=72 x^2+20x+100=72 x^2+20x+28=0 x=(-20+-sqrt(400-112))/2 x=-10+6*sqrt(2)

algrebra
Solve by applying the quadratic Formula: all radicals should be simplified as far as possible. Show your work. a^2 -12a + 35 =0

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