Monday
December 22, 2014

Posts by Chris


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 di fferent 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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