Sunday

October 23, 2016
Total # Posts: 1,197

**Physics**

Commercial airplanes are sometimes towed out of the passenger loading area by a tractor. The 1800 kg tractor exerts a force of 1.75 104 N backward on the pavement, and the system experiences forces resisting motion that total 2400 N. (a) If the acceleration is 0.250 m/s2, what...

*October 8, 2016*

**College Algebra**

compute the cost to remove 25% of the air pollutants

*October 8, 2016*

**chemistry **

How can values of heats of formation found in tables be used to calculate heats of reactions? I am having a really hard time understanding this.

*October 2, 2016*

**chemistry **

How much energy is required to make H2O(g) from H2O(l)? Basically this deals with bond energies and heats of formation. But I'm not sure how to find it

*October 2, 2016*

**Math**

Let C=f(q)=450+0.2q give the cost in dollars to manufacture q kg of a chemical. a) Which of the following statement(s) correctly explain the meaning of f^(−1)(C) b)Find a formula for f^(−1)(C)=

*September 26, 2016*

**Chemistry **

Five year old Andrew weighs 45 lbs and requires insulin. His doctor has prescribed 0.150 units of insulin/kg body weight/hr while he is in the hospital. The insulin bottle you have possesses a concentration of 20.0 units/15.0 ml and all must be given. Give all answers to three...

*September 24, 2016*

**Math**

False because 0 does not equal 2. If it was just zero is less than 2 it would be true.

*September 24, 2016*

**chemistry **

is this statement true? More heat is needed for vaporization of a liquid compared with melting a solid of the same substance.

*September 23, 2016*

**chemistry **

If you transfer 5 J of energy to 1 g water and to 1 g ethanol, each starting at the same temperature which would have a higher temperature at the end? Water or ethanol? or will they have the same temperature at the end?

*September 23, 2016*

**Math**

Rewrite the expression 2logx−3log(x^2+1)+4log(x−1) as a single logarithm logA. Then the function

*September 20, 2016*

**Math**

Solve for x 8⋅4^2x−4=53

*September 19, 2016*

**Math**

The cost (in dollars) of producing x air conditioners is C=g(x)=560+40x. Find a formula for the inverse function g−1(C).

*September 19, 2016*

**Chemistry help please!**

Why does a clear, saturated solution of PbI2 form a yellow precipitate when a small amount of KI is added to the solution? A. KI is insoluble in PbI2. B. PbI2 is always insoluble in water. C. Adding KI is like adding I-, which drives the reaction toward the formation of I-. D...

*September 19, 2016*

**Chemistry please help!**

What happens to the following reaction at equilibrium if the pressure is decreased? 2H2(g) + O2(g) 2H2O(g) A. The equilibrium shifts left because Q > K. B. The equilibrium shifts right because Q < K. C. The equilibrium shifts left because Q < K. D. The equilibrium ...

*September 19, 2016*

**Chemistry**

pH indicators change color at their _____. The pH at which the color change happens for a particular indicator molecule depends on its: A. pKa; concentration. B. pKa; Ka or Kb. C. equivalence point; Ka or Kb. D. equivalence point; concentration. Is the correct answer A?

*September 18, 2016*

**Chemistry**

Given the reaction: Cu2+(aq) + S2-(aq) CuS(s) What will happen (a) if CuSO4(aq) is added? And (b) if Na2SO4(aq) is added? A. (a) Nothing; (b) Less product will form B. (a) Less product will form; (b) Nothing C. (a) Nothing; (b) More product will form D. (a) More product will ...

*September 18, 2016*

**Chemistry**

At a high temperature, the equilibrium constant for the decomposition of hydrogen iodide is 65.0. If the initial concentration of HI is 1.60 M, what is the concentration of hydrogen at equilibrium? 2Hl(g) H2(g) + I2(g) A. 1.42 M B. 0.753 M C. 0.240 M D. 0.802 M I think that ...

*September 18, 2016*

**Chemistry**

The pH of your swimming pool is found to be 6.89. What is the concentration of H+ ions in the pool? A. 7.76 × 106 M B. 0.84 M C. 1.29 × 10-7 M D. 1.29 × 107 M

*September 17, 2016*

**Chemistry**

Which of the following pairs would make a good buffer? A. H2C2O4 and HC2O4- B. HNO3 and NO3- C. NaOH and NaCl D. HCl and NaOH Would it be C? I think I remember learning about these in a lesson about buffers, hence why my instinct is to go with C...

*September 17, 2016*

**Chemistry**

A solution has [OH-] = 3.5 × 10-6. Based on that, what must be true about this solution? A. It is an acidic solution. B. It is a strong base. C. It is a strong acid. D. It is a basic solution.

*September 17, 2016*

**Chemistry**

When are more products of a reaction available initially than at equilibrium? A. K = 0 B. Q < K C. Q = K D. Q > K

*September 17, 2016*

**English **

The subject,verb and object in " great people endure criticism without resentment"

*September 12, 2016*

**Chem2**

The vapor pressure of water (at 50.0 o C) is lowered by 17.0 torr when 36.1 g of an unknown non-electrolyte is added to 65.56 g water. Determine the molecular weight of the unknown. Density solution = 1.05 g/mL Vapor pressure H2O @ 50oC = 92.5 torr

*August 31, 2016*

**math homework help**

write the equation of the ellipse that has its centre at the origin with focus (0,4) and vertex at (0,7)

*August 30, 2016*

**math**

solve the system of equations algebraically for real values of x and y { x+y=16 x^2+y^2=128 a. (6,6) b. (8,6) c. (9,8) d. (8,8) e. no solution

*August 29, 2016*

**math**

find the equation of the hyperbola with vertices (4,0), (-4,0) and focus (7,0)

*August 29, 2016*

**math**

any sound from one focus of an ellipse reflects off the ellipse directly back to the other focus. This property explains whispering galleries such as Statuary Hall in Washington DC. Imagine a whispering gallery in the shape of a semi-ellipse. The distance between F and F is 28...

*August 29, 2016*

**math help please?!**

Find all (a) minors and (b) cofactors of the matrix [ -3 2 -8 ] 3 -2 6 -1 3 -6

*August 29, 2016*

**math help please?!**

Solve the system by Gauss - Jordan elimination. { 1/3 x + 3/4 y - 2/3 z = -8 x + 1/2 y + 1/3 z = 18 1/6 x = 1/8 y - z = -24 a. (−6, 8, −24) b. (−6, −8, −24) c. (0, 8, −24) d. (6,8,24) e. (6, −8, 24)

*August 29, 2016*

**math help please?!**

An object moving vertically is at the given heights at the specified times. Find the position equation s = 12 at^2 + v (small o) t + s (small o) for the object. At t = 1 second, s = 161 feet At t = 2 seconds, s = 98 feet At t = 3 seconds, s = 3 feet a. s=−8t^2−t&#...

*August 29, 2016*

**math**

Find A - B A = [ 3 7 8 ] B = [ 2 2 6 ] 7 9 3 6 7 8 7 9 9 5 8 6

*August 26, 2016*

**math**

Find A + B A = [ 5 5 7 ] B = 4 9 7 3 8 6 9 2 6

*August 26, 2016*

**math**

Solve the system by Gauss - Jordan elimination. { 1/3 x + 3/4 y - 2/3 z = -8 x + 1/2 y + 1/3 z = 18 1/6 x = 1/8 y - z = -24 a. (−6, 8, −24) b. (−6, −8, −24) c. (0, 8, −24) d. (6,8,24) e. (6, −8, 24)

*August 26, 2016*

**math**

Find values of x and y, if any, that will make the matrices equal. [ x y ] = [ 3 5 ] 1 9 1 9 a. x=-3,y=-5 b. x=5,y=3 c. x=-3,y=5 d. x=3,y=5 e. no solution

*August 26, 2016*

**math**

An airplane flying into a headwind travels the 1650-mile flying distance between two cities in 3 hours and 18 minutes. On the return flight, the distance is traveled in 3 hours. Find the airspeed of the plane and the speed of the wind, assuming that both remain constant.

*August 24, 2016*

**chem**

What will be the result of a reaction if its enthalpy change is positive, its entropy change is negative and Gibbs free energy is positive? A. Never spontaneous B. Nonspontaneous, if the temperature is low C. Spontaneous, if the temperature is high D. Always spontaneous

*August 19, 2016*

**Math**

The answer options I get are either a. 0, pi/3 b. 0, pi/6, pi/3, pi/2 which one would you say suits best?

*August 19, 2016*

**Math**

In the interval 0 'less than or equal to' x 'less than or equal to' pi find the values that satisfy the equation cos 2x - sin x = 0

*August 19, 2016*

**Math**

Tony visits the local fair and sees one if therides, the ferris wheel. The ferris wheel has a diameter of 50 feet and is on a platform of 4 feet. if it takes 12 seconds to make one full revolution, what is the equation of the height of a person on the ferris wheel at any time...

*August 19, 2016*

**Math**

Thank you. Can you explain to me the difference between ( and [ ?

*August 17, 2016*

**Math**

Let f(x)= 2x - 1, g(x)= 3x - 2. Find the domain of the function,(f + g)(x)

*August 17, 2016*

**Math**

Find the M is the midpoint of the line segment PQ, what is the coordinates of point Q? P (4, 5), M (-2, -3)

*August 17, 2016*

**math**

find the trigonometric form of the complex number - (square root) 3 + i

*July 16, 2016*

**math**

find the trigonometric form of -12-12(square root)3i a. 24(cos2pi/3 + isin 2pi/3) b. 24(cos4pi/3 + isin 4pi/3) c. 12(cos 4pi/3 + isin 4pi/3) d. 12(cos12pi/3 + isin 2pi/3) e. 12(squareroot) 2 (cos4pi/3 + isin 4pi/3)

*July 16, 2016*

**math**

find the standard form of the complex number shown below 9(cos 11pi/6 + isin 11pi/6) a. 2/9 - 2(squareroot)3/9 i b. -4(squareroot)3/9 + 4/9 i c. 9/2 - 9(squareroot)3/2 i d. 9(squareroot)3/2 - 9/2 i e. -9(squareroot)3/4 - 9/4 i

*July 16, 2016*

**Physics**

A cube of side L is place in a uniform electric field E = 3200 N/C. What is the net flux through the cube. Assume the electric field lines are parallel with the edges of the cube. Make sure you know why this is the answer. I know its not perpendicular or at an angle So if it...

*June 28, 2016*

**statistics**

A coin is biased so that the probability of obtaining a head is 2/3. The coin is tossed four times. Find the probability of obtaining exactly two heads.

*June 21, 2016*

**Language A**

How about the third one?? And sorry about that

*May 19, 2016*

**Language A**

Selecting 1: There's good news and bad news about grizzly bears in the American West. The good news? Their numbers have been increasing in recent years. In 1975, grizzlies made the threatened-species list under the federal Endangered Species Act. The bad news? Some ...

*May 19, 2016*

**Language A**

1: There's good news and bad news about grizzly bears in the American West. The good news? Their numbers have been increasing in recent years. In 1975, grizzlies made the threatened-species list under the federal Endangered Species Act. The bad news? Some politicians want ...

*May 19, 2016*

**Language A**

how does the author of selection 1 express his or her point of view differently than the author of selection two? author of selection one agrees with abandoning federal protection of grizzly bears author of selection one believes that the increase in grizzly bear population ...

*May 19, 2016*

**Civics**

Thank you :)

*May 18, 2016*

**Civics**

Beginning in 1995, most countries in the European Union started to switch to a common currency. The values of different European currencies were linked to the euro. Countries in the European Union could then trade without converting currency. Why would adopting a common ...

*May 18, 2016*

**algebra**

294 round to ten

*May 4, 2016*

**algebra**

is that the answer

*May 4, 2016*

**algebra**

A house has increased in value by 38% since it was purchased. If the current value is $483,000 , what was the value when it was purchased?

*May 4, 2016*

**Calculus**

I figured out the answers.

*April 30, 2016*

**Calculus**

An island is 3 mi from the nearest point on a straight shoreline; that point is 6 mi from a power station. A Utility company plans to lay electrical cable underwater from the island to the shore and then underground along the shore to the power station. Assume ...

*April 30, 2016*

**Geometry**

If the width of rectangle ABCD is 8 cm and the length of diagonal line AC is 14, find the length of rectangle ABCD. A2 + b2 = c2. 64+ b2 =196. square root of b2 = square root of 132. B =2square of 33. L = ?

*April 6, 2016*

**History**

worked for connexus

*March 24, 2016*

**geometry**

The area of a triangle is 6 square feet. The base is 3 times the height. What is the base of the triangle?

*March 22, 2016*

**Organic chemistry**

Limone (MW 136g/mol) is a pleasant smelling liquid found in lemon and orange peels. The boiling point of limonene is 175 ˚C, but it co-distills with water at 97.5 ˚C. If the vapour pressure of water at 97.5˚C is 690 mmHg, what percent (by mass) of the steam-...

*March 9, 2016*

**LA**

Did you take the test? i need help and i don't what the text is that they want us to proivide an example from.

*March 7, 2016*

**Physics**

find the heat flow through the sides of an 25cm tall by 10cm wide of ice water in 46s.The glass is 6.00mm thick; the temperature is inside is 28 celcius, the temperature outside is 50 celcius

*February 25, 2016*

**chamistry**

24000cm3

*February 19, 2016*

**chamistry**

formula: 2Cl- ==> Cl2 + 2e- in one experiment, the volume of chlorine gas formed was 18cm3. i) calculate the amount, in moles, of chlorine gas in 18cm3.(the volume of 1 mol of a gas at room temperature and pressure is 24000) ii) calculate the quantity of electricity, in ...

*February 19, 2016*

**chemistry!**

what observations are made when you bubble chlorine into a solution of potassium iodide?

*February 19, 2016*

**Math**

Sorry I meant bigger

*February 17, 2016*

**Math**

Sorry I meant bigger

*February 17, 2016*

**Math**

A piece of wire is 60 inches long. The wire needs too be bent into two peices. The prices are both bent in a square. If the ratio of the length or the pieces are 3:2. What is the ration for the smaller square to the nuggets square?

*February 17, 2016*

**Math**

Hello so I'm just wondering comparing the variable x and the number 9, do they have different degres? I know that x has a degree of 1 but for 3 i'm not sure...please help

*February 16, 2016*

**Physics**

Assuming 95.0% efficiency for the conversion of electrical power by the motor, what current must the 12.0-V batteries of a 845-kg electric car be able to supply to do the following? (a) accelerate from rest to 25.0 m/s in 1.00 min (b) climb a 200-m high hill in 2.00 min at a ...

*February 14, 2016*

**Health**

1. One of your friends tries to stop an argument between you and your sister. Your friend is practicing A. empathy B. hazing C. harassment D. mediation** 2. Which is the best example of a win-win situation? A. One side gets what it wants. B. Both sides get what they want, but ...

*January 22, 2016*

**Algebra help pls fast**

How do you Find the lateral area of a square pyramid. base:8 Height:22. and side:8 Help pls

*January 8, 2016*

**world**

lol

*January 8, 2016*

**Math**

2 is wrong(D) 3 is wrong (B) 4 is wrong. The first one is correct

*January 8, 2016*

**Math**

So I can tell you if they are correct?

*January 8, 2016*

**Math**

Im good at this but what are your answers you choose?

*January 8, 2016*

**Pre-Algebra Help pls fast**

How do you Find the lateral area of a square pyramid. base:8 Height:22. and side:8 Help pls

*January 8, 2016*

**Physics**

A spring with a force constant of 1.0 N/cm is compressed to a displacement of 10.0 cm. When released, it's energy is used to rotate a mass of 0.50 kg, secured by a spring, around in a circle with radius of 0.75 m, starting at the top of the circle. After 0.3 s has elapsed...

*December 15, 2015*

**Physics**

A spring with a force constant of 1.0 N/cm is compressed to a displacement of 10.0 cm. When released, it's energy is used to rotate a mass of 0.50 kg, secured by a spring, around in a circle with radius of 0.75 m, starting at the top of the circle. After 0.3 s has elapsed...

*December 15, 2015*

**Geometry**

when two parallel lines are cut by a transversal and one alternate interior angle is x squared and the other is 3x. How do u slove for x?

*October 29, 2015*

**geometry **

if two parallel lines are cut by a transversal and two interior angles are 3x and x sqaured. how do you solve for x?

*October 29, 2015*

**science- physics**

Two spheres are launched horizontally from a 1.1 m -high table. Sphere A is launched with an initial speed of 4.5 m/s . Sphere B is launched with an initial speed of 1.5 m/s . What is the distance that sphere A travels from the edge of the table? What is the distance that ...

*October 15, 2015*

**math**

There are 3 pink marbles, 2 yellow marbles, and 5 blue marbles in a bag. What is the probability of drawing 2 pink marbles?

*October 13, 2015*

**Math**

The expression 18h + 100p represents the amount(in dollars) that an insurance salesperson earns for working h hours and selling p policies. How much does the salesperson earn for working 10 hours and selling 3 policies? Thank you so much.

*October 8, 2015*

**science- physics**

y= 24

*October 8, 2015*

**science- physics**

A position vector with magnitude 40 m points to the right and up. Its x-component is 32 m . What is the value of its y-component?

*October 8, 2015*

**science- physics**

Find the x- and y-components of the vector d⃗ = (6.0 km , 31 ∘ left of +y-axis). I worked it out and got 5.14, 3.09 and apparently it's wrong, I don't know what I did wrong.

*October 8, 2015*

**History**

Before the Industrial Revolution, people would mostly farm and everyone would help out. They would use animals for transportation and got their food from farming or trading for food. Clothing was sewn by hand.

*September 30, 2015*

**U.S. History**

Dry, right?

*September 30, 2015*

**U.S. History**

Was it easier for Paleo-Indians (hunter gatherers) in dry climate or cold climate?

*September 30, 2015*

**What is the approximate distance between points A and B?**

A coordinate grid is shown from negative 5 to 0 to 5 on both axes at increments of 1. The ordered pair negative 4, 5 is labeled as A, and the ordered pair 3, negative 2 is labeled as B. 3.74 units 7.95 units 8.56 units 9.90 units

*September 28, 2015*

**Geometry**

What is the approximate distance between points A and B? What is the approximate distance between points A and B? A coordinate grid is shown from negative 5 to 0 to 5 on both axes at increments of 1. The ordered pair negative 4, 5 is labeled as A, and the ordered pair 3, ...

*September 28, 2015*

**Geometry**

What is the measure of angle x? A pair of parallel lines is cut by a transversal. An exterior angle on the left of the transversal is labeled as 40 degrees. An interior angle on the right of the transversal, which is not vertically opposite to the 40 degree angle, is labeled ...

*September 28, 2015*

**science- physics**

A car is traveling at a steady 90 km/h in a 50 km/h zone. A police motorcycle takes off at the instant the car passes it, accelerating at a steady 7.3 m/s/s.How much time elapses before the motorcycle is moving as fast as the car? How far is the motorcycle from the car when it...

*September 27, 2015*

**physics**

In college softball, the distance from the pitcher's mound to the batter is 43 feet. If the ball leaves the bat at 105 mph, how much time elapses between the hit and the ball reaching the pitcher? I figured out how many ft there would be in a second, but I'm not so ...

*September 18, 2015*

**maths**

I think 38 because jade ate 4. Nicole ate 8. Kahlee ate 16. And Chris ate 10. Add them all up and you get 38.

*September 18, 2015*

**Geometry**

but how do i fin <1 and <3?

*September 14, 2015*

**Geometry**

but how do i fin <1 and <3?

*September 14, 2015*