Tuesday

November 24, 2015
Total # Posts: 859

**Calculus**

Use integration by parts to evaluate the definite integral. S 12 x/sqrt of x+4 dx 0
*November 12, 2015*

**physics**

The potential energy of a pair of hydrogen atoms separated by a large distance x is given by U(x)=-C(subscript)6/x^6, where C_6 is a positive constant. What is the force that one atom exerts on the other? Is this force attractive or repulse? I've taken the derivative of ...
*November 11, 2015*

**Chemistry**

Enthalpy I'm given that the heat of reaction for the combustion of ethane is -1560kJ/mol. I need to figure out how much heat is produced from 18g of ethane. 2 C2H6 + 7 O2 --> 4 CO2 + 6 H2O Okay so I'm rough on Thermo right now, so I gave it my best shot. Could we ...
*November 8, 2015*

**Chemistry**

Enthalpy I'm given that the heat of reaction for the combustion of ethane is -1560kJ/mol. I need to figure out how much heat is produced from 18g of ethane. 2 C2H6 + 7 O2 --> 4 CO2 + 6 H2O Okay so I'm rough on Thermo right now, so I gave it my best shot. Could we ...
*November 8, 2015*

**Chemistry**

Enthalpy I'm given that the heat of reaction for the combustion of ethane is -1560kJ/mol. I need to figure out how much heat is produced from 18g of ethane. 2 C2H6 + 7 O2 --> 4 CO2 + 6 H2O Okay so I'm rough on Thermo right now, so I gave it my best shot. Could we ...
*November 8, 2015*

**Calculus 1**

Locate the absolute extrema of the function f(x)=Sinpix on the closed interval [1,1/3]
*November 4, 2015*

**Calculus**

Evaluate ∫ (cos(x))^(1/2)sin(x)dx Let u = cos(x)? ∫ (u)^(1/2)sin(x)dx = ∫ [2u^(3/2)/3]sin(x)dx ∫ [2cos(x)^(3/2)/3] (-cos(x)) dx? I thought this involved the FTC, but now I'm thinking that's false.
*November 4, 2015*

**Calculus**

Alright, I want to see if I understand the language of these two problems and their solutions. It asks: If F(x) = [given integrand], find the derivative F'(x). So is F(x) just our function, and F'(x) our antiderivative? 1) F(x) = ∫(2, x) [t^(3)+1]^(1/2)dt Let u...
*November 4, 2015*

**Calculus**

Use a Riemann sum with n = 3 terms and the right endpoint rule to approx. ∫(1, 2) sin(1/x)dx. My teacher just needs the terms written out, no need to add or multiply. This is a problem she did up on the board, so here's her answer: sin(4/3)(1/3) + sin(5/3)(1/3) + sin...
*November 4, 2015*

**maths**

If you reduce one side by the same amount of what you increase on another side, the differences should cancel out. Thus the perimeter should stay the same, easily leaving 48(Perimeter of your rectangle AND square) to be divided by 4 (sides of a square).
*October 16, 2015*

**Calculus**

Differentiate to find critical numbers and leave function in fully factored form. g(x) = (x^2+1)^5(x^2+2)^6 g'(x) = (x^2+1)^5[6(x^2+2)^5(2x)] + (x^2+2)^6[5(x^2+1)^4(2x)] g'(x) = 2x(x^2+1)^4(x^2+2)^5[6(x^2+2)(2x) + 5(x^2+1)(2x)] g'(x) = 2x(x^2+1)^4(x^2+2)^5(11x^2+11...
*October 14, 2015*

**chemistry**

Two identical elements covalently bonded together. (Di - two) (Atomic - atoms). This refers to how certain elements occur in nature. For example, hydrogen is a gas found in nature as H₂. This does not involve ionic bonding. If I am correct, this occurs only with nonmetal...
*October 13, 2015*

**chemistry**

I am not a tutor so I am sorry if cause misunderstanding. You have aqueous solutions that involve salt and sugar as your solutes. The solvent just holds the solute in the solution. However, salts are ionic compounds that completely dissociate(separate) in solution. This means ...
*October 13, 2015*

**science**

I'm no anatomical genius but, 1.) is incorrect since sperm is only found in males. 2.) correct 3.) Eggs are not supposed to really provide anything to the mother. The egg + sperm is the child (zygote). First think of how a zygote (male sex cell + female sex cell) would ...
*October 13, 2015*

**Math**

My numerator is less than my denominator.I am more than 1/2. What fractions can Ibe
*October 9, 2015*

**Geometry**

Point D is on the interior of angle ABC. Use the given information to find m angle DBC. (Draw the picture.) M angle ABC = (5x +6) M angle ABD = (7x - 9) M angle DBC = (5x - 6) Answer so far: (5x + 6) + (5x - 6) = (7x - 9) 10x = 7x - 9 10 x - 7x = -9 3x = -9 X = -3 Do not ...
*October 5, 2015*

**Calc**

An airplane is flying at a speed of 350 mi/h at an altitude of one mile and passes directly over a radar station at time t=0. a) Express the horizontal distance d (in miles) that the plane has flown as a function of t. I really don't know... would it be something like d= t...
*October 5, 2015*

**Calculus**

Finding critical numbers g(theta) = 16(theta) - 4tan(theta) I can only get the derivative of g to be g'(theta) = 16 - 4sec^2(theta). Am I supposed to move on to get sec^2(theta) = 4, then sec(theta) = 2?
*October 4, 2015*

**Calculus**

We are finding critical numbers f(x)= 8x^3+x^2+8x f'(x)=24x^2+2x+8 -> 2(12x^2+x+4) I'm honestly stuck. All I can tell is that I need to set my f'(x)=0, but I am lost there too. Quadratic form. equates to (-1±i√191)/24 I believe. That is as far as I ...
*October 4, 2015*

**Calculus**

We are finding critical numbers f(x)= 8x^3+x^2+8x f'(x)=24x^2+2x+8 -> 2(12x^2+x+4) I'm honestly stuck. All I can tell is that I need to set my f'(x)=0, but I am lost there too. Quadratic form. equates to (-1±i√191)/24 I believe. That is as far as I ...
*October 4, 2015*

**Calculus**

We are finding critical numbers f(x)= 8x^3+x^2+8x f'(x)=24x^2+2x+8 -> 2(12x^2+x+4) I'm honestly stuck. All I can tell is that I need to set my f'(x)=0, but I am lost there too. Quadratic form. equates to (-1±i√191)/24 I believe. That is as far as I ...
*October 4, 2015*

**Calculus**

So chain rule is necessary since x and y are different variables on one side, forming a composition?
*September 27, 2015*

**Calculus**

Find y" by implicit differentiation. x^3+y^3 = 1 (x^3)'+(y^3)' = (1)' 3x^2+3y^2(y') = 0 3y^2(y') = -3x^2 y' = -3x^2/3y^2 y' = -x^2/y^2 y" = [(y^2)(-x^2)'-(-x^2)(y^2)']/y^4 y" = [(y^2)(-2x)-(-x^2)(2y)]/y^4 y" = [(-2xy^2...
*September 27, 2015*

**Calculus**

y" = (2x+4)(-1.5(x+1)^-2.5) + (x+1)^-1.5(2) y" = (x+1)^-1.5[2+(2x+4)(-3/2(x+1))] y" = (x+1)^-1.5[2+(-6(x+1)/2(x+1))] y" = (x+1)^-1.5[2+(-3)] y" = -(x+1)^-1.5 Also, thank you for your time!!
*September 26, 2015*

**Calculus**

Just got through with derivatives, power rule, and chain rule. I am supposed to find the first and second derivatives of the function. y = 4x/√x+1 and y = cos^2(x) y' = [(x+1)^(1/2)(4)]-[(4x)(1/2(x+1)^(-1/2))(1)] y' = [4(x+1)^(1/2)-4x]/[2(x+1)^(1/2)(x+1)] y'...
*September 26, 2015*

**Calculus**

We just learned derivatives and now on the Chain Rule. y = r/[(sqrt)(r(sqrd)+1)] y' = [[(sqrt)(r(sqrd)+1)(r)'] - [(r)(sqrt)(r(sqrd)+1)']] / [(sqrt)(r(sqrd)+1)](sqrd) y' = (sqrt)(r(sqrd)+1) - r[1/2(r(sqrd)+1)(raised to -1/2)](2r) My final answer is -3r/[2(sqrt)(...
*September 25, 2015*

**physics**

A rocket is fired at an angle from the top of a tower of height h0 = 65.5 m . Because of the design of the engines, its position coordinates are of the form x(t)=A+Bt2 and y(t)=C+Dt3, where A, B, C , and D are constants. Furthermore, the acceleration of the rocket 1.50 s after...
*September 19, 2015*

**Math**

3 because 9/3 is 3
*September 8, 2015*

**Math**

What is the square root of 9? 9/3 3 so 3 is the square root of 9
*September 8, 2015*

**calculus**

a particle starts from rest and moves along a straight line with an acceleration equal to 24-15√t where distance and time are measured in terms of feet and seconds respectively. with what acceleration will the particle return to the starting point?
*September 4, 2015*

**calculus**

find the equation of the curve for which y''=(12/x^3) if it passes through (1,0) and is tangent to the line 6x+y=6 at that point.
*August 10, 2015*

**calculus**

find the equation of a curve for which y''=6x-6 if the curve has a critical point at (2,1).
*August 10, 2015*

**calculus**

find the equation of the curve for which y''=6x-4 and which passes through (1,2) and (-2,5).
*August 10, 2015*

**calculus**

find the equation of the curve for which y'=3x^2 and which passes through (1,-1)
*August 10, 2015*

**calculus**

Find the equation of the curve for which y''=6x-4 and which passes through (1,2) and (-2,5). thank you :-)
*August 6, 2015*

**calculus**

Find the equation of the curve for which y'=3x² and which passes through (1,-1).
*August 6, 2015*

**calculus**

If dy=(2x+1)dx and y=7 when x=1, find the value of y when x=3.
*August 6, 2015*

**math algebra**

At your local bar, chicken wings cost $0.30 a piece on Thursday night. Sriacha Ranch dressing (enough for 10 wings), cost $0.10 per serving. A pitcher of of ice tea cost $7.50 and a serving of celery cost $2.50 . Tax in your part of LA County is 8.5% and the standard tip rate ...
*August 3, 2015*

**Math**

a woman drives to work and averages 70 kilometers per hour for the trip. On her trip from work to home she averages 100 kilometers per hour. What is her average speed for the round trip?
*July 15, 2015*

**Algebra **

Problem solving (point of intersection) You are considering changing your cell phone plan . Company A offered a flat fee of $40 plus 10cents for each additional min of use. Company B offers a monthly flat fee of $20 plus 15 cents for each additional min of use. What plan would...
*July 13, 2015*

**Problem solving (point of intersection)**

You are considering changing your cell phone plan . Company A offered a flat fee of $40 plus 10cents for each additional min of use. Company B offers a monthly flat fee of $20 plus 15 cents for each additional min of use. What plan would you choose? Equation : y=. x+ Equation...
*July 13, 2015*

**Problem solving (point of intersection)**

Alpine Valley charges $10/hr for lessons and $40 for the lift ticket and snowboard rental. Chicopee Hills charges $20/hr which includes lessons, lift ticket and rentals. Which resort would you choose? Equation A: y=. X+ Equation B: y=. X+ Decide on a reasonable starting point ...
*July 13, 2015*

**statistics**

A simple random sample of 1350 registered voters shows that 58% favor Candidate A over Candidate B. Construct a 99% confidence interval for the percent of the population of all registered voters who prefer Candidate A over Candidate B.
*May 13, 2015*

**trig**

Find the values of sin 0, cos 0, and tan 0ƒáif the angle 0ƒáis in standard position and its terminal side passes through the point (¡V15, 8). Give answers as fractions.
*May 3, 2015*

**phisical science**

What is the amplitude of a longitudinal wave
*April 6, 2015*

**M ath**

Thank you, Yes I can do B from here.
*April 3, 2015*

**M ath**

Sally has a sum of $26000 that she invests at 9% compounded monthly. What equal monthly payments can she receive over a period of a) 9 years? b) 7 years?
*April 3, 2015*

**english**

Using a single formatting _____ helps to make reading researched information easier;it lets the reader know what to expect. A. Citation B. Text C. Style D. Website My answer was b it was wrong so I'm thinking the answer is c
*March 23, 2015*

**English**

To use another's ideas in your own words is to ___ those ideas. A. Paraphrase B. establish C. Manifest D. Refute My answer was b I got it wrong so would the answer be A
*March 23, 2015*

**English**

No B
*March 23, 2015*

**English**

Would the answer be A
*March 23, 2015*

**English**

Which of the following would most likely be an entry in a sentence outline? A. Education tool B. Education can change a person's life C. Education as a pathway D. Education beyond high school versus education beyond college My answer was D I got it wrong Would it be a
*March 23, 2015*

**CHECK ANSWERS PLEASE!!!**

Hi
*March 18, 2015*

**Physics**

A body of mass m is suspended from a spring with spring constant k and the spring is stretched 0.1. If two identical bodies of mass m/2 are suspended from a spring with the same spring constant k, how much will the spring stretch? Explain your answer. The first case is when ...
*March 12, 2015*

**physics for physical science **

A stone thrown vertically upwards with a speed of 12m/s from the edge of Cliff 70m high. Calculate the time the stone takes to hit the bottom of the cliff.
*March 9, 2015*

**algebra**

The sum of two numbers is 70. One number is 10 more than twice the other number. Using Elimination find the numbers.
*February 26, 2015*

**Physics**

Two men of the same mass climb the same flight of stairs. The first man climbs the stairs for 25 seconds, while the seconds person takes 35 seconds. Which man does the most work?
*February 26, 2015*

**English **

Five sentence paragraph. To make a perfect turkey sandwich you will need, butter knife, turkey, cheese,mayo, lettuce, tomato and two slices of bread. Next, place the mayo evenly on both side of the bread. On one slice of the bread place the cheese,turkey,lettuce,and tomato. ...
*February 21, 2015*

**Physics**

A bike and cyclist have a combined mass of 75 kg. If the brakes can apply a maximum force of 20 N, what is the shortest time in which the cyclist can stop?
*February 10, 2015*

**IPC**

A hailstone traveling with a velocity of 43 meters/second comes to a virtual stop 0.28 seconds after hitting water. What is the magnitude of its acceleration in the water? a. 12 meters/second2 b. 1.5 × 102 meters/second2 c. 78.6 meters/second2 d. 6.5 × 10-3 meters/...
*February 6, 2015*

**maths**

-2(2x-5)(3x+1)
*February 2, 2015*

**math**

what is the total cost for 4 1/10 pounds of vanilla pudding? vanilla pudding=$7/lb
*January 14, 2015*

**physics**

The small piston of a hydraulic lift has a cross-sectional area of 3.6 cm2 and the large piston has an area of 86 cm2. What force F must be applied to the small piston to maintain the load of 52 kN at a constant elevation?
*January 4, 2015*

**Algebra**

1.33
*December 10, 2014*

**Math**

You own 80 mp3s. You plan to add 10 more songs every month. Represent this relationship to show how many mp3s you have for th nxt six months. What is the independent x varible?
*December 10, 2014*

**Astronomy**

A simple temperature model for the solar nebula disk is ￼Tdisk(a) = 20 � SQRT 100 AU/ a K, (1) where a should be expressed in AU in this equation. ￼(a) Find the temperature in the solar nebula disk at the orbit of Mer- cury, Earth and Jupiter. (b) Where is...
*November 13, 2014*

**Science Physics**

How many Btu of heat must be added to 1200 lb of copper to raise its temperature from 100°F to 450°F -specific heat for copper is 0.092-
*November 4, 2014*

**Specific Heat**

Forgot to add specific heat for copper is 0.092
*November 3, 2014*

**Specific Heat**

How many Btu of heat must be added to 1200 lb of copper to raise its temperature from 100°F to 450°F
*November 3, 2014*

**Science Physics**

How many Btu of heat must be added to 1200 lb of copper to raise its temperature from 100°F to 450°F
*November 3, 2014*

**Physics (heat)**

A coal sample yields 1.25 X 10^4 Btu/lb. How many foot-pounds of work result from burning 1.00 ton of this coal?
*November 3, 2014*

**Science Physics**

600/9800
*November 3, 2014*

**Science Physics**

A lifeguard swims with her head just above the water. What is the volume of the submerged part of her body if she weighs 600 N? Would I need to divide by 9800 or 62.4?
*November 3, 2014*

**Science Physics**

A flat-bottom river barge is 30.0 ft wide, 85.0 ft long, and 15.0 ft deep. (a) How many ft3 of water will it displace while the top stays 3.00 ft above the water? (b) What load in tons will the barge contain under these conditions if the empty barge weighs 160 tons in dry dock?
*October 31, 2014*

**physics**

Bob, who has a mass of 80kg , can throw a 550g rock with a speed of 27m/s . The distance through which his hand moves as he accelerates the rock forward from rest until he releases it is 1.0 m. What constant force must Bob exert on the rock to throw it with this speed? If Bob ...
*October 30, 2014*

**Fluid Mechanics Physics**

A flat-bottom river barge is 30.0 ft wide, 85.0 ft long, and 15.0 ft deep. (a) How many ft3 of water will it displace while the top stays 3.00 ft above the water? (b) What load in tons will the barge contain under these conditions if the empty barge weighs 160 tons in dry dock?
*October 29, 2014*

**Hydraulic Physics**

thank you
*October 29, 2014*

**Hydraulic Physics**

So it would be 50.0/25.0*20.0=40
*October 29, 2014*

**Hydraulic Physics**

In a hydraulic system a 20.0-N force is applied to the small piston with cross sectional area 25.0 cm2. What weight can be lifted by the large piston with cross sectional area 50.0 cm2? Would I need to divide both pistons areas then mutiply the force? and or have gravity in ...
*October 29, 2014*

**Fluid Mechanics**

A flat-bottom river barge is 30.0 ft wide, 85.0 ft long, and 15.0 ft deep. (a) How many ft3 of water will it displace while the top stays 3.00 ft above the water? (b) What load in tons will the barge contain under these conditions if the empty barge weighs 160 tons in dry dock?
*October 29, 2014*

**Fluid Mechanics**

In a hydraulic system a 20.0-N force is applied to the small piston with cross sectional area 25.0 cm2. What weight can be lifted by the large piston with cross sectional area 50.0 cm2?
*October 29, 2014*

**MATH (PROBABILITY) **

According to Nielsen Media Research, approximately 52% of all U.S. households have digital cable television. In addition, 84% of all U.S. households have multiple TV sets. Suppose 45% of all U.S. households have digital cable television and have multiple TV sets. A U.S. ...
*October 10, 2014*

**Chem 30 Thermodynamics **

Your friend comes across a good deal to purchase a gold ring. She asks you for advice for you to test the ring. The ring has a mass of 4.54 g. When you heat the ring with 94.8 J of energy, its temperature rises from 23.0 degrees celsius to 47.5 degrees celsius. Would you ...
*October 9, 2014*

**physics**

Suppose that 1100 j of work is done by the force 30 n in moving the suitcase a distance of 50 m. At what angle is the force oriented with respect to the ground?
*October 8, 2014*

**Physics (Force)**

A power wheelbarrow has a mass of 432 kg. What force must be applied to give it an acceleration of 1.75 m/s2?
*September 30, 2014*

**FRACTION CONCEPTS**

I am a fraction whose numerator and denominator are both prime numbers less than 20. if you were to increase each term by 1, I would be equivalent to 1/2. what fraction am I?
*September 23, 2014*

**Physics**

A relativistic proton has a momentum of 1.0×10^-17 kg ∙ m/s and a rest energy of 0.15 nJ. What is the kinetic energy of this proton? (c = 3.00 × 108 m/s, mass of proton = 1.67 × 10-27 kg)
*September 20, 2014*

**Physics**

Assume that a certain city consumes electrical energy at an average rate of 2.0× 10^9 W. What would be the mass change in producing enough energy to keep this city running for 21 weeks?
*September 20, 2014*

**math/stats**

What is the standard deviation of a $1 bet on any one particular number, e.g., 33, in the game of American roulette? Notice the payoff is 35:1 for this type of bet.
*September 2, 2014*

**statistics**

What is the standard deviation of a $1 bet on any one particular number, e.g., 33, in the game of American roulette? Notice the payoff is 35:1 for this type of bet.
*September 2, 2014*

**physics **

how long does it take an car travailing in the left lane of a highway at 60km/h to overtake another car in the right lane traveling at 40km/hr when the cars start 100meters apart
*July 27, 2014*

**geometry**

one side of a parallelogram has endpoints (2,1) and (3,5) The endpoints for the opposite side are (5,2) and (6,6) true or false
*July 16, 2014*

**Biology**

can you please help me with number 19. the question is The function of the magnified structure shown in the image below is ___________ exchange.
*May 22, 2014*

**AP chemistry**

42.1 degrees celsius
*May 20, 2014*

**geography**

what is the value of igneous rocks to humankind?
*April 21, 2014*

**math**

The garage you work for as an auto mechanic measures 230 ft. by 150 ft and handles 69 cars. Using the existing garage as a model, how much space would you plan to have in your garage?
*April 19, 2014*

**math**

You require space to service 65 vehicles at any one time. Will a facility measuring 145 ft. by 130 ft. be adequate if each vehicle requires 300 sq.ft.?
*April 15, 2014*

**math**

Hal Fritz purchased a $5,000 bond at 95. The annual interest is 6%.What was the cost of the bond? What was the annual interest? What is the yield (to nearest tenth of a percent)? please help
*April 12, 2014*

**Chemistry**

Are my answers correct? Identify each energy exchange as primarily heat or work and determine weather the sign of ?E is positive or negative for the system. A. A rolling billiard ball collides with another billiard ball. The first ball (system) stops rolling after the ...
*April 9, 2014*