Monday

December 22, 2014

December 22, 2014

Total # Posts: 2,259

**Physics**

At the top of an inclined track, a spring is attached to a rod at one end and a dynamics cart at the other such that the spring stretches parallel to the track. The cart has a mass of .850kg and there is negligible friction between the cart and the track. The spring has a ...
*March 3, 2014*

**Physics**

A spring of unknown force constant is attached to a rod so that it hangs vertically. With no mass attached, the spring has a length of 12.0 cm. When a student attaches a mass of 50 grams, the spring stretches to a length of 18.0cm. Determine the force constant for this spring.
*March 3, 2014*

**physics**

A 25.5- kg block (m1) is on a horizontal surface, connected to a 5.7- kg block (m2) by a massless string as shown in the Figure. The pulley is massless and frictionless. A force of 239.3 acts on m1 at an angle of 32.1 . The coefficient of kinetic friction between m1 and the ...
*March 3, 2014*

**Algebra**

Sorry I submitted before finishing my input. Arrange the terms of the polynomial in ascending powers of b. 25db^5-7dm+3b^10-6db^6 Am I correct? Please help? My answer is: 25b^5d-7dm+3b^10-6b^6d=3b^10-6b^6d+25b^5d-7dm
*March 2, 2014*

**Algebra**

Arrange the terms of the polynomial in ascending powers of b. 25db^5-7dm+3b^10-6db^6 Please tell me if I am correct on my answer? I got: 25b
*March 2, 2014*

**math**

The Mills Lunch Shop prepares fresh take-out entrees each day. On Tuesday, 40 baked chicken dinners were prepared at a cost of $3.20 each. A 20% spoilage rate is anticipated. Mills Lunch Shop sells the dinners at an 80% markup based on cost. They decided to offer a $1.00-off ...
*March 2, 2014*

**Science**

Why do you think the human brain has more convolutions than a pig brain?
*March 1, 2014*

**Chemistry**

The value of KC for the interconversion of butane and isobutane is 2.5 at 25°C. If you place 0.067 mol of butane in a 0.250-L flask at 25°C and allow equilibrium to be established, what will be the concentrations of the two forms of butane? A)[butane] B)[isobutane]
*March 1, 2014*

**political science**

what civil liberties are protected by the Georgia Constitution?
*February 27, 2014*

**physics**

The oxygen taken in by the body reacts with fats, carbohydrates, and protein, liberating energy internally at a rate of about 2.12×104 J /liter. If a 85.4 kg man requires 73.0 W of power even while sleeping, what is his rate of oxygen consumption?
*February 25, 2014*

**physics**

A 0.13 kg ball of dough is thrown straight up into the air with an initial speed of 18 m/s. The acceleration of gravity is 9.81 m/s2 .What is its momentum halfway to its max- imum height on the way up?
*February 24, 2014*

**math**

Triangle abc and triangle xyz are similar. If ab,bc, and ac are 10, 13, and 14 inches respectively, and xy is 11 inches, find xz to the nearest tenth of an inch.
*February 24, 2014*

**PHYSICS**

A large stone block has been loaded in the bed of a dump truck. The bed is slowly raised until it makes an angle of 30 degrees with the horizontal; at this point, the block starts to slide downward. What is the coefficient of static friction between the block and the truck bed...
*February 23, 2014*

**PHYSICS**

2.352 m/s^2
*February 23, 2014*

**Finite Math and Applied Calculus **

Betty Sue sets up a retirement account. For the first 35 years, she deposits $500 at the end of each month into an account with an annual interest rate of 3.6%, compounded monthly. Then, she stops making monthly payments and transfers the money into a different account ...
*February 19, 2014*

**statistic**

I a 3 team league the teams play each other once per year. Team A won 3 over a 2 year period. Team B won 4 and Team C won 5 What is the probability of Team wining all two games next season
*February 19, 2014*

**Science**

Why is the thymus gland so large in the fetal pig?
*February 19, 2014*

**economics**

The government could pass new laws that force you to use environmentally friendly cleaning products which may cost more and ultimately increase your overhead.
*February 15, 2014*

**Physics**

Ball A is thrown straight down off the top of a tall building with an initial velocity of 20m/s. Ball b is thrown straight up from the top of the same building with initial velocity of 20 m/s. Which ball, if either, experiences the greater acceleration after leaving the ...
*February 7, 2014*

**physics**

A proton, initially traveling in the +x-direction with a speed of 6.00×105m/s , enters a uniform electric field directed vertically upward. After traveling in this field for 4.38×10−7s , the proton’s velocity is directed 45 ∘ above the +x-axis.
*February 6, 2014*

**Math**

.50x+.20y=3.60 x+y=9
*February 5, 2014*

**Help!!!**

Thanks Emily! Got a 100!
*February 3, 2014*

**science(check answers)**

im the one who needs help not give help
*January 29, 2014*

**Physics**

A car experiences a constant acceleration of 2.3 m/s2. How long does it take (in s) for the car's speed to increase from 6.6 m/s to 17.9 m/s?
*January 29, 2014*

**PHYSICS**

Suppose that the electric potential outside a living cell is higher than that inside the cell by 0.0928 V. How much work is done by the electric force when a sodium ion (charge = +e) moves from the outside to the inside? no idea how to do this can i just have the step by step ...
*January 28, 2014*

**physics**

The coeﬃcient of linear expansion for a silver strip is 1.9 × 10−5 / ◦C. What is its length on a hot day when the temperature is 32◦C if the strip is 1.4 m long when it is −15◦C? Answer in units of m Your answer must be within ±...
*January 24, 2014*

**Math**

Kyle is training for a bike race. He rides 5 miles one day, 10 miles the next day, and 15 miles the third day. If Kyle repeats this schedule, what is the total distance he will have ridden after 5 days?
*January 16, 2014*

**5th grade math**

Tia collected $10 for a walk-a-thon and $ 5 from each friend. What is the total amount of donations she collected from 4 friends? Is my answer below correct? Friend - 1,2,3,4 Donations - $5, $5, $5, $5 = $20 Answer is $20 from 4 friends.
*January 14, 2014*

**Geometry**

Suppose point J has coordinate of -2 and JK=4. Then what is the possible coordinate(s) for K?
*January 10, 2014*

**Math **

Let f(x)=ln(3x^(2)-2x-4). Find the domain.
*January 8, 2014*

**social studies**

A) Thomas Jefferson Because He Was In That Time Frame and was actually president when the Louisiana purchase Happened. :)
*December 30, 2013*

**Chemistry **

What is the effect of Independent Variable on Dependent Variable ?
*December 30, 2013*

**Chemistry **

What is the effect of Independent Variable on Dependent Variable ?
*December 30, 2013*

**Calculus**

what is the limit n to infinite of cos1*cos(1/2)*cos(1/4)*cos(1/8)*cos(1/16)*...*cos(1/2^n)
*December 19, 2013*

**Batteries - Engineering**

Here we consider instead dissolving guns (which we will assume are pure iron) with sulfuric acid. Fe+H2SO4->FeSO4+H2 It is apparent that they must use an outside source of electrical power to drive the dissolution of the iron. They use a small current so that the ...
*December 18, 2013*

**Solar Energy - Engineering**

In the process of electrolysis, electrical power is used to separate water into oxygen and hydrogen molecules via the reaction: H2O --> H2 + ½O2 This is very much like running a hydrogen fuel cell in reverse. We assume that only the activation potential for the ...
*December 18, 2013*

**Engineering**

What is the answer for b and c? Please Help.
*December 15, 2013*

**Math 5th grade**

Mrs. Rodriguez mixed water and plant food in a container and filled the container until it measured 6/8 gallon. She poured 4/8 gallon of the mixture on her geraniums and 1/8 gallon on her petunias. How much of the mixture did she have left after pouring ot on her plants?
*December 9, 2013*

**Chemistry**

What are the formulas of the salts that precipitate when the reaction mixture (n-butyl alcohol, sodium bromide, water, and sulfuric acid) is cooled?
*December 2, 2013*

**chemistry**

From the periodic table, you get the atomic mass of Mg, which is 24.31. Atomic mass is grams/mole, by dimensional analysis: (2.5g)/(24.31g/mol)=0.1028 moles of Magnesium as the grams units cancel out. *This answer does not have proper significant figures.
*December 2, 2013*

**Chemistry**

Balancing Complete Redox Reactions I need help on the half reduction part for both reduction and oxidation of Cl2(g) --> cl^1- (aq) + OCl^1- (aq). I got both of the half reactions started. Cl2 --> Cl^- (Reduction) .... Cl^1- (aq) + OCl^1- (aq) (Oxidation). I need know ...
*November 23, 2013*

**Chemistry**

Balancing Complete Redox Reactions I need help on the half reduction part for both reduction and oxidation of Cl2(g) --> cl^1- (aq) + OCl^1- (aq). I got both of the half reactions started. Cl2 --> Cl^- (Reduction) .... Cl^1- (aq) + OCl^1- (aq) (Oxidation)
*November 23, 2013*

**science**

what is matter
*November 21, 2013*

**Chemistry**

A solution is made by adding 0.100 mole of ethyl ether to 0.500 mole of ethyl alcohol. If the vapor pressures of ethyl ether and ethyl alcohol at 20 oC are 375 torr and 20.0 torr, respectively, the vapor pressure of the solution at 20 oC (assuming ideal behavior) is:
*November 14, 2013*

**Chemistry**

Benzene (C6H6) and toluene (C5H5CH3) form nearly ideal solutions. At 20°C the vapor pressure of benzene is 74.7 Torr and that of toluene is 22.3 Torr. a) Find the equilibrium partial pressures above a solution of 100.0 g benzene and 100.0 g toluene. b) Find the mole ...
*November 14, 2013*

**math**

explain how you could show five less than a number using an expression
*November 14, 2013*

**Maths**

An operation produces (A-1)/A from a fraction A=m/n, where m is not equal with n and m is not zero. If the initial value of A is 22/47 and the operation is repeated 2012 times, the final output is a/b. What is a and b?
*November 9, 2013*

**Math**

Find the common factors of each set of numbers. 1. 1,4,8,32_____
*November 3, 2013*

**civics**

I have searched for a case study done on women being paid less in the workforce and cannot come up with anything. Would any of you know of any real-life examples of women being paid less?
*November 3, 2013*

**physics**

An iron rod(a=11.8x10-6 C-1) has a length of 1000 meters (or 1 km) at 0 degrees Celsius. If the rod must expand 10 cm to bridge a gap, to what temperature must the rod be heated?
*November 1, 2013*

**physics**

An iron rod has a length of 1000 meters (or 1 km) at 0 degrees Celsius. If the rod must expand 10 cm to bridge a gap, to what temperature must the rod be heated?
*November 1, 2013*

**Physics **

A container of volume 19.4 cm3 is initially filled with air. The container is then evacuated at 0oC to a pressure of 6.0 mPa. How many molecules are in the container after evacuation if we assume that air is an ideal gas?
*October 29, 2013*

**Maths**

The line segment connecting two points (-2,7) and (4,-1) can be expressed in parametric equations as x=-a+bt, y=c-dt (0<=t<=1). Find the values a,b,c,d.
*October 29, 2013*

**Maths**

Suppose x,y,p and q are real numbers and the inverse element for multiplication of the complex number x+yi is 5-11i. If (5-11i)^2 * (x+yi)^3 = p+qi, the value of p+q can be expressed as a/b. What is the value of a and b?
*October 28, 2013*

**Maths**

If x(x+i)+y(y+i)-14(8+i)=0, find x and y.
*October 28, 2013*

**Maths**

I made a small typing mistake. The center is (10,sqrta). so, what is a?
*October 28, 2013*

**Maths**

In polar coordinates, the parametric equations x=6+cos(f) and y=sin(f) represent a circle C1. In Cartesian coordinates, there is a circle C2 that is externally tangent to C1, tangent to the y-axis, and centered at (10,sqrt2). What is the value of a?
*October 28, 2013*

**Maths**

z=x(1-i)+24(-2+i) , x is a real number. if z^2 is a negative real number what is x?
*October 28, 2013*

**Bank management**

You own a corporate bond that carries a 5.8 percent coupon rate and pays $10000 at maturity in exactly 2 years. The current market yield on the bond is 6.1 percent. Coupon interest is paid semiannually and the market price is $9944.32. Calculate Macaulay's duration and ...
*October 27, 2013*

**Maths**

Consider the line defined by the parametric equations x=3d-10, y=2d+1. The y-intercept of this line can be expressed as a/b. Find a and b.
*October 27, 2013*

**maths**

If the quadratic equation (8+i)x^2+(a-i)x+38-2i=0 has real roots, what is the value of the positive real constant a?
*October 27, 2013*

**government**

New Hampshire was the first State to _____.
*October 24, 2013*

**Maths**

Thanks for your help in all the questions
*October 23, 2013*

**Maths**

Given a rectangular object with dimensions 2cm by 22cm, we want to increase the length of the smaller dimension and decrease the length of the larger dimension by Xcm each. If the the diagonal has to be kept less than (sqrt360)cm in length, the range of X can be expressed as a...
*October 23, 2013*

**Maths**

If the vertex of the parabola y=x^2-2ax+2a^2 is on the line y=24x+25 what is the value of a (positive number)
*October 23, 2013*

**Maths**

The difference between the two roots of the quadratic equation x^2+ax+b=0 is 32 and the larger root is 3 times the smaller root. What is the value of a and b ?
*October 19, 2013*

**6th grade math**

If Jack takes 6 hours to wash 4 cars then at that rate how man cars could be washed in 42 hours? we got answer of 28 cars but then how do you determine the rate the cars were being washed? the teacher gave answer of 2/3 cars per hour but we don't understand how she got that.
*October 15, 2013*

**6th grade math**

It takes 1.5 hours to walk three miles. How far can he go if he walked for 4 3/4 hours?
*October 15, 2013*

**6th grade math**

Dante can buy 20 marbles for $1.50. How many marbles can he buy for $27.00? Do you divide &27.00 by $1.50 then multiply that number by 20 to get 360 marbles?
*October 15, 2013*

**Maths**

Suppose that a is an integer such that x^2+2xy−360y^2+ax+38y+361 can be factorized as the product of linear expressions in x and y. What is the value of a ?
*October 15, 2013*

**Maths**

If the graph of y=(ax-5)/(x+b) does not intersect either of the lines x=7 or y=−3 , what is the value of a and b ?
*October 15, 2013*

**Statistics**

Smoking habit Socioeconomic status High Low Smoking 15 40 55 Not smoking 25 10 35 Total 40 50 N=90 a. For these ordinal variables, which hypothesis testing is appropriate to test the relationship between SES and smoking habits variable? b. Write the HO and H1 c. Perform the ...
*October 14, 2013*

**Statistics**

2. A researcher wants to find out how students feel about a proposal to ban smoking on campus. She selected THREE groups of “students who currently smoke”, “students who formerly smoke”, and “students who never smoke”. Also, she selects a sample ...
*October 14, 2013*

**Maths**

For two sets X={-1,1,a} and Y={7,16,b} f(x)=x^3+8 is a bijective function from X to Y. What is the value of a and b ?
*October 13, 2013*

**Maths**

If (x−48)−(y+16)i=0, what are the values of x,y?
*October 13, 2013*

**Math**

A shopper asked for 50 cents worth of apples. The shopper was surprised when she received ﬁve more than the previous week. Then she noticed that the price had dropped 10 cents per dozen. What was the new price per dozen?
*October 12, 2013*

**Maths**

For 2 sets X={1,2,3,4},Y={−15,0,30}, f is a surjective function from X to Y. If f(1)=−15 and f(2)=f(4)=0, what is f(3) ?
*October 12, 2013*

**6th grade math**

When planting trees in a forest, the US Forest Service recommends giving each seedling about 1/200 acre on which to grow. About how many seedlings should be planted in 1/3 of an acre? 1/3 times 200/1?
*October 11, 2013*

**Mathematical induction. I'm stuck. So far I have..**

For all integers n ≥ 1, prove the following statement using mathematical induction. 1+2^1 +2^2 +...+2^n = 2^(n+1) −1 Here's what I have so far 1. Prove the base step let n=1 2^1=2^(1+1)-1 False. Someone else suggested that the base step is : 1+2^1=2^(1+1)-1 ...
*October 11, 2013*

**statistics**

How many friends must you have to guarantee that at least five of them will have birthdays in the same month?
*October 11, 2013*

**Discrete Math**

How many friends must you have to guarantee that at least five of them will have birthdays in the same month?
*October 11, 2013*

**Math Reasonableness **

Luciel has 365 cookies to sell. She wants to store them in plastic bags that hole 12 cookies each. she estimates she will need 30 bags.Is he right? Why or why not?
*October 10, 2013*

**Math Explanation**

If you are asked to find 834/80=, how do you know the quotient is greater than 10 before you actually divide?
*October 9, 2013*

**Maths**

Consider the parabola y=x^2-2px+p+1. If the real number p has the property a<p<b, then the vertex of y is above the line y=−12x+13. What are a and b?
*October 8, 2013*

**Maths**

Given that a and b are real numbers and that x satisfies the inequality ax>=b when x>=14, what is the smallest integer x that satisfies ax>a+2b ?
*October 8, 2013*

**6th grade math**

Rachel completed 3/4 of her cleaning in 4 hours. How many total hours will Rachel spend cleaning? 4 divided by 3/4 4/1x4/3=16/3= 5 1/3 hours Is this correct?
*October 6, 2013*

**Maths**

If a line with x-intercept −5 and y-intercept 35 passes through point P=(5,a) , what is the value of a ?
*October 6, 2013*

**Maths**

Let y=ax+b be the equation of the line with x-intercept 2 and y-intercept −12. What are a and b values?
*October 6, 2013*

**Maths**

Given that −24<A<39 , let x and y be the maximum and minimum integer values, respectively, of −2A+5. What is x and y?
*October 6, 2013*

**Maths**

Consider the line passing through two points P=(1,8) and Q=(−1,3). If the line also passes through point R=(15,a), what is the value of a?
*October 6, 2013*

**maths**

Given that a and b are real numbers and that x satisfies the inequality ax>=b when x>=75, what is the smallest integer x that satisfies ax>a+2b ?
*October 4, 2013*

**Statistics**

The American Academy of Pediatrics (AAP) recommends that kids 2-5 years old watch no more than (on average) 1.6 hours a day of quality programming. A researcher selected a sample of 101 kids in the neighborhood and asked their parents how many hours per day they allow their ...
*October 4, 2013*

**Statistics**

1.The average number of acts of physical violence in a random sample of 150 TV movies was 4.5 acts with a standard deviation of 0.75. At the 95% confidence interval level, what is your estimation of the mean range of all movies shown in the television? Explain the result in ...
*October 4, 2013*

**math**

3x21=63 63-3=60 -The answer is 21
*October 4, 2013*

**Physics**

A 0.568 kg particle has a speed of 1.57 m/s at point A and kinetic energy of 7.67 J at point B. What is its kinetic energy at A? What is its speed at point B? What is the total work done on the particle as it moves from A to B?
*October 1, 2013*

**Physics**

A block of mass 2.30 kg is pushed 2.38 m along a frictionless horizontal table by a constant 16.0 N force directed 26.9o below the horizontal. Determine the work done by the applied force. Determine the magnitude of the normal force exerted by the table. Determine the ...
*October 1, 2013*

**physics**

If a woman lifts a 16.2 kg bucket from a well and does 6.33 kJ of work, how deep is the well? Assume that the speed of the bucket remains constant as it is lifted.
*October 1, 2013*

**Maths**

Two candidates A and B are up for election. A is so popular that the number of votes for B is expected to be less than or equal to 10% of A's votes. If the total number of votes for both candidates is 110 , what is the minimum number of votes we could expect A to receive?
*October 1, 2013*

**maths**

If P=(a,a) is a point on the line y=−2x+27, what is the value of a?
*September 30, 2013*

**maths**

If a line with x-intercept −3 and y-intercept 21 passes through point P=(8,a) , what is the value of a?
*September 30, 2013*

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