Friday

January 30, 2015

January 30, 2015

Total # Posts: 2,529

**physics**

The velocity of a particle constrained to move along the x-axis as a function of time t is given by: v(t)=-(13/t_0) sin(t/t_0). a)If the particle is at x=4 m when t = 0, what is its position at t = 5t_0. You will not need the value of t_0 to solve any part of this problem. b)...
*October 21, 2010*

**physics**

What angle does the tangent to the curve y(x)=sin^2(x/9)+16sin(x/9) at x=9\pi make with the x-axis?
*October 21, 2010*

**physics**

E^2/(e^(E/T)-1)Evaluate dn/dE at fixed T and enter it below.
*October 21, 2010*

**College Chemisty**

Al
*October 20, 2010*

**Math [Interest]**

Okay, so I've been away from school for three weeks, and we have a math test tomorrow. I only just found out, and my friend emailed me the review questions. If someone could help me out, and show me how to do this, I'd appreciate it. No, I do not want someone to do my ...
*October 20, 2010*

**math**

it is impossible
*October 20, 2010*

**spanish**

what does que te encatanda mas,el chocolate o la pizza mean
*October 19, 2010*

**Physical Science**

Would the change be a negative number?
*October 19, 2010*

**Physical Science**

A 1.0 kg glass bowl at 37 °C is placed in a freezer. How much heat will the freezer have to remove from the bowl to take it to 0 °C? (cglass = 0.2 cal/deg-gm)
*October 19, 2010*

**Trig**

If b=5 , the angle C=50 and the angle A=50 find the other angle B and the remaining sides and . Give your answer to at least 3 decimal places.
*October 18, 2010*

**Chemistry**

A. 1.6×±0^-4 M B. 6.3% C. 3.2×±0^-4 M
*October 18, 2010*

**engineering**

Using mechanics of materials principles, (i.e. equations of mechanical equilibrium applied to a free-body diagram), derive the following equations: s’ = s cos2q = s[(1+ cos 2q) / 2] t' = s sinq cosq = s [sin 2q / 2] s=sigma, q=theta, t=tau I have looked in "...
*October 18, 2010*

**Math Algebra**

kassie an kesya are dividing $39 into two parts in order that the sum of 2/3 of one part and 3/4 of the other part is $28. What are the parts?
*October 18, 2010*

**PLEASE HELP**

WOULD IT BE 13 OVER 30
*October 17, 2010*

**PLEASE HELP**

PLEASE ANSWER THE FRACTION 14 OVER 15 - THE FRACTION 1 OVER 2. HURRY!
*October 17, 2010*

**calc**

(e^x + e^-x)/2=1
*October 17, 2010*

**Math **

so the answer is 7/12?
*October 17, 2010*

**history**

i know how to write an essay, it's this topic that i need help with, like what can you learn from it? and was it neccesary or not?
*October 17, 2010*

**history**

explain reign of terror face in the french revoloution. discuss robesperre's involvement and evolution of \his political views. do u think it was neccessary in the revolution? what lessons can be learned from this event? i have to write an essay on this please give me any ...
*October 17, 2010*

**math**

wouldnt the distance be 3 miles though if the one mile train must travel 1 mile (distance of itsself) plus the distance of the other train which is 2 miles?
*October 17, 2010*

**math**

a freight train that is 1 mile long is traveling at 60mph. a second train that is 2 miles long is traveling 40mph. the trains are moving in opposite directions on parallel tracks. how many seconds does it take between the time their locomotives meet and their cabooses fully ...
*October 17, 2010*

**math**

find a such that f(x)= ax2-4x+3 has a maximum value of 12
*October 16, 2010*

**math**

find a such that f(x)= ax2-4x+3 has a maximum value of 12
*October 16, 2010*

**calculus**

Find the area of the region lying inside the polar curve r = 2(1 − cos theta) and outside the polar curve r + 4 cos(theta)= 0.
*October 13, 2010*

**calculus**

Find the area of the region lying inside the polar curve r = 2(1 − cos theta) and outside the polar curve r + 4 cos(theta)= 0.
*October 13, 2010*

**calculus**

find the area of the region bounded by the polar curve r=sqrt(6ln(theta)+3 as well as the rays theta=1 and theta=e
*October 13, 2010*

**Algebra 2**

Let (x1,y1) be a solution, other than (0,0), of a direct variation equation. Write an second direct variation equation whosegraph is perpindicular to the graph of the first equation.
*October 12, 2010*

**Physics**

Two identical point charges are fixed to diagonally opposite corners of a square that is .5m on a side. Each charge is 3.0E-6 C. How much work is done by the electric force as one of the charges moves to an empty corner?
*October 11, 2010*

**Science**

A mixture of 10.902 g if iron(II) oxide and 6.524 g of aluminum metal is placed in a crucible and heated in a high temperature oven, where a reduction of the oxide takes place: 3 FeO(s) + 2Al(ℓ) ! 3 Fe(ℓ) + Al2O3(s) . What is the limiting reactant? What is the ...
*October 10, 2010*

**Chemistry**

1.19 atm
*October 8, 2010*

**chemistry**

express liquid pentanol and gaseous oxygen as a chemical reaction
*October 8, 2010*

**math**

andy has 23 coins worth 3.65 consisting of only quarters and dimes.how manydimes does he have?
*October 5, 2010*

**VESPR theory**

But is a molecule with an electronic geometry of tetraheydral and a molecular geometry of bent the only one like that? Why doesn't a square pyramidal have <120 degree angles when it has a lone pair? Or does it? I feel like more of the bond angles should be less than the...
*October 5, 2010*

**VESPR theory**

On one of my pages of notes, it lists all the different shapes and the bond angles that go along with them. Next to bent (2 lone pairs, 2 bonds), it says <109.5 degrees for bond angles. I don't understand why that one is less than 109.5, when a trigonal pyramidal isn&#...
*October 5, 2010*

**VESPR theory**

Is a bent tetraheydral the only shape that doesn't have a precise angle (as in it's less than 109.5 degrees)?
*October 5, 2010*

**Physics**

Forgot to put my question at the end of it XD This is from me trying to interpret what you've done in the previous times this question has been asked, but obviously, I'm wrong somewhere. At what point in the work am I messing up?
*October 3, 2010*

**Physics**

Let me try to clarify v1=22.222 m/s v2=13.278 m/s x=vi(t)+1/2a(t^2) 56.7=22.222t+1/2a(t^2) 24.4=13.278t+1/2a(t^2). Through elimination 32.3=8.94t t=3.611s From there I separated to -vi=at as vf is 0 -22.222=a(3.611) -13.278=a(3.611) -35.5=7.222a a=-4.92 m/s^2
*October 3, 2010*

**Physics**

To stop a car, you require first a certain reaction time to begin braking. Then the car slows under the constant braking deceleration. Suppose that the total distance moved by your car during these two phases is 56.7 m when its initial speed is 80.0 km/h, and 24.4 m when the ...
*October 3, 2010*

**calculus**

Find the sum of the series (-1)^n (5^(2n))/n! 1. sum = e^25 2. sum = e^−5 3. sum = 5 4. sum = e^5 5. sum = 25 6. sum = e^−25
*September 30, 2010*

**calculus**

017 10.0 points Lance Armstrong is moving with speed 35 feet/sec and acceleration 4 feet/sec2 when he crosses the starting line of a stage in the Tour de France. Use a degree two Taylor polynomial T2(t) to estimate how far he travels in the next second. 1. distance = 38 feet 2...
*September 30, 2010*

**1st grade**

2 bones + 3 dogs is 5 objects or 2 bones - 3 dogs = -1 bones
*September 27, 2010*

**Chemistry**

What is the chemical equation for white flour? Thanks!
*September 27, 2010*

**Chemistry**

How many molecules are in 2.6 grams of H2O?
*September 26, 2010*

**phy**

a=6750
*September 26, 2010*

**calculus**

With power series, is an endpoint convergent if you plug it back into the original series, and get an alternating series that is conditionally convergent?
*September 22, 2010*

**Chemistry 1145**

These UV photons can break chemical bonds in your skin to cause sunburn—a form of radiation damage. If the 310 nm radiation provides exactly the energy to break an average chemical bond in the skin, estimate the average energy of these bonds in \rm kJ/mol.
*September 22, 2010*

**Algebra 1**

trtyrt
*September 21, 2010*

**Geometry**

The perimeter of a regular pentagon is 31 cm. Find the length of each side.
*September 21, 2010*

**Math**

z x 12 = 60
*September 21, 2010*

**science**

2000
*September 20, 2010*

**math**

75Z% lil lames
*September 20, 2010*

**physics 2**

yo mama
*September 19, 2010*

**physics**

Aerial skiing involves speeding down a steep ramp that curves sharply upward at the end to launch the skiers into the air. Once airborne, the skier twists and turns in complex combinations to score points in the competition. Consider an aerial launch ramp that has a final ...
*September 19, 2010*

**calculus**

The sum from n=1 to infinity of cos(npi/3)/n! Does this absolutely converge, conditionally converge, or diverge?
*September 19, 2010*

**Chemistry**

69
*September 18, 2010*

**cjs 230**

I need some information for the project that I can use not word for word in my own words.
*September 18, 2010*

**cjs 230**

I need help with my final project in cjs/230
*September 18, 2010*

**Biology**

Wow, your no help Sra
*September 18, 2010*

**health**

What would be the major steps in implementing electronic health record proposal? I have some ideas are they right? planning commitmment of staff active involvement training
*September 17, 2010*

**health**

Describe a place where organizations share information among competitors electronically.
*September 17, 2010*

**chemistry**

A 281 lb fullback runs the 40 yd dash at a speed of 23.0 ± 0.1 mi/h.(a) What is his de Broglie wavelength (in meters)?(b) What is the uncertainty in his position? i determined the wavelength correctly, but how do you determine the uncertainty
*September 16, 2010*

**Chemistry**

8.6*10^-19
*September 15, 2010*

**5th grade economics**

i am a 4-digit number greater than 9000. My hundreds digit is twice than ny ten digit. My ones digit is greater than my tens digit. The sum of my digit is 20. What number am i?
*September 14, 2010*

**math**

a person has $4 in nickles, quarters, and dimes. there is a total of 36 coins altogether. the number of quarters is 4 less then the number of dimes. Algerbaicly determine the number of each type of coin using a system of 3 equations with 3 variables.
*September 13, 2010*

**science**

What are the chemical elements in citric acid?
*September 13, 2010*

**math**

how many differnt ways can 50 players in a marching band be arranged in rectanagle arrangement?
*September 12, 2010*

**chemistry**

Calculate the specific heat (\rm{J/g \; ^\circ C}) for a 18.5-\rm g sample of tin that absorbs 183 {\rm J} when temperature increases from 35.0 ^\circ \rm C to 78.6 ^\circ \rm C
*September 12, 2010*

**8th grade Math**

what is more dense 14cm3 or 8cm3
*September 9, 2010*

**math**

I can't find the variable and expression for the poulation of oakland. Here's something to help you with Oakland, California is 5,417 less than the poulation of omaha, nebraska.
*September 8, 2010*

**english**

LOL! Is this for the Dillon's gift card?
*September 8, 2010*

**math**

andy and kate are running around a 400 meter track. if they run in the same direction. andy will pass kate in 100 secounds. if they run in the opposite direction they will meet in 25 seconds. what is andys velocity in meters per seconds?
*September 8, 2010*

**Physics**

The problem contains graphics that I don't know how to show other than in an image format: h t t p : / / b i t . l y / c D H P V M h t t p : / / b i t . l y / 9 m b y C R
*September 7, 2010*

**Physics**

A long jumper jumps at a 45 degree angle towards the right bank which is 10.0 m away horizontally and 2.5 m vertically below. How long, or short, of the opposite bank will she land?
*September 7, 2010*

**Algebra 2 URGENT PLEASE HELP**

h t t p : / / b i t . l y / b z p B K 9
*September 7, 2010*

**Algebra 2 URGENT PLEASE HELP**

f(x1)=y1 ------------ f(-1)=1 So x1=-1 and y1=1 f(x2)=y2 ------------ f(1)=-2 So x2=1 and y2=-2 We have two points: (x1, y1) and (x2, y2) = (-1, 1) and (1, -2). The slope between those two points is (y2-y1)/(x2-x1) = (-2-1)/(1-(-1)) = -3/2 = m The equation for a line is (y-y1...
*September 7, 2010*

**physics**

How far does the object travel during this time?
*September 5, 2010*

**physics**

An object with an initial velocity of 5 m/s accelerates uniformly for 15 s. (a) If the final velocity is 37 m/s, what is the acceleration?
*September 5, 2010*

**geometry**

Make a conjecture about the next item in the sequence:2-6,18,-54
*September 2, 2010*

**math**

a 9 percent salt water solution is mixed with 4 oz. of an 18 percent salt water solution in order to obtain a 15 percent salt water solution. how much of the first should be used?
*September 2, 2010*

**analogy**

dock is to what as park is to garage? open is to close as retreat is to what?
*September 1, 2010*

**9th grade**

what does it mean to name the intersection of the planes in a triangular prism
*August 31, 2010*

**Math**

6/5hrs
*August 31, 2010*

**Math**

Solve: 5g² - 13g + 6 = 0
*August 31, 2010*

**physics**

A certain airplane has an acceleration of 15.0 m/s2 How fast will it be moving2.5s after it starts down runway How far down runway during the 2.5s
*August 26, 2010*

**Algebra**

-1<5-2p<5
*August 26, 2010*

**math**

drove from rich to boston at avg speed of 50 mph,if it took 5 hrs to drive from rich to phila at an avg speed of 70 mph and if the whole trip took 13 hrs how far is it from phila to boston?
*August 25, 2010*

**algebra**

(1/t-1)-(1/t+2)
*August 25, 2010*

**math**

what is range
*August 24, 2010*

**12th grade maths**

5/6=1/3-x please solve
*August 20, 2010*

**math**

how many ways are there to chose a three digit lottery number? numbers like 003,014,222,232 or 123 are all allowed.
*August 18, 2010*

**math**

suppose T is a right angle whose sides have a b c. is it possible that each of a b c is an odd integer?
*August 12, 2010*

**arithmetic**

In a certain arithmetic sequence, t6 + t15 = –141 and the common difference is –7. What is the first term of the sequence? explain how to do this please
*August 11, 2010*

**math**

the digits of a two digit number are reversed. when both of these numbers are added the result is 88 and when subtracted the result is 54. the original two digit number contains which of the following digits 2 3 5 or 7
*July 28, 2010*

**Chemistry**

Don't you mean divide? Don't you get L^2mol /mol^2 Lxs The thing is idk if it can be reduced to L/molxs or A) Can it?
*July 24, 2010*

**Chemistry**

What would the units of the rate constant k be in a second order equation if rate was measured in mol/(L x s)and all concentrations in mol/L a)L/(mol x s) b)L2/(mol2 x s) c)L3/(mol3 x s) d)mol2/(L2 x s) I think it's b) but d) is very tempting
*July 24, 2010*

**Chemistry**

When zinc, iron and lead are reacted with hydrochloric acid the variable most easily measured in order to determine the effect of the chemical nature of the reactants on reaction rate is a)temperature b)colour c)surface area d)volume of gas e)concentration Think it's d. Am...
*July 24, 2010*

**Chemistry**

What is the overall order of reaction for the elementary system A+2B=products? a)0 b)1 c)2 d)3 e)5 Can somebody explain this question to me. I don't get it.
*July 24, 2010*

**Chemistry**

So the answer is a?
*July 24, 2010*

**Chemistry**

Consider the following two thermochemical equations N2+2.5O2-> N2O5(s) Delta H=xkJ N2+2.5O2-> N2O5(g) Delta H=ykJ The enthalpy change in kJ for the sublimation of one mole of N205 solid to gas would be represented by the quantity a)x+y b)x-y c)y-x d)-x-y Assuming it'...
*July 24, 2010*

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