Monday
December 22, 2014

Posts by sarah


Total # Posts: 4,458

Science Physics
An object weighs 12 N on earth. When it is brought to Mars, it has a weight of 4.8 N. What is the acceleration due to gravity on Mars? (Taking the acceleration due to gravity on earth is 10 m/s²)
April 1, 2013

Mechanics
Two objects with masses 5.60 and 2.40 hang 0.600m above the floor from the ends of a cord 8.00m long passing over a frictionless pulley. Both objects start from rest.Find the maximum height reached by the 2.40kg object
April 1, 2013

Mechanics
Two objects with masses 5.60 and 2.40 hang 0.600m above the floor from the ends of a cord 8.00m long passing over a frictionless pulley. Both objects start from rest.Find the maximum height reached by the 2.40kg object
March 31, 2013

math
Karina drew a shape with 2 pairs of parallel sides and no right angles. Which shape could Karina have drawn? A. square B. rhombus C. rectangle D. trapeziod
March 27, 2013

algebra
wrong
March 27, 2013

Algebra
Given f(x) = (x-1)(x-2) + (x-2)(x-5) + (x - 3)(x-8), what are the sum of the roots of f(x)?
March 26, 2013

physics
thank you
March 26, 2013

physics
How to calculate the series AC coupling capacitance? Is there an equation for this? Thank you for any help
March 26, 2013

chemistry
Why must the water levels be equal in a tube before measuring the volume of gas?
March 26, 2013

PHYSICS
Thanks! That works and makes sense. :)
March 26, 2013

PHYSICS
Here is one of my questions from my physics study. It tells me the answer (35 J), but how do I find that answer? I would appreciate a formula or step by step calculation. Thanks! :) A 30 kg kid on rollerskates is moving 1 m/s. His brother pushes him with a force of 5 N. What ...
March 26, 2013

Reading
In Ralph Waldo Emerson's "Nature", how does he show his idealism in the essay? I don't understand what the question's asking...what's idealism?? thank you!!!
March 25, 2013

Calculus
I've done p= x(3750 − 1/3x^2) and C = x(1000 + 70x + 3x^2) Profit= 3750x-1/3x^3-1000x-70x^2-3x^3= 2750x-70x^2-4/3x^3 P'(x)= 2750-140x-12x^2 Then I did the Quadratic Formula and and got 22 but it's wrong
March 25, 2013

Calculus
The monthly demand function for a product sold by a monopoly is p = 3750 − 1/3x^2 dollars, and the average cost is C = 1000 + 70x + 3x^2 dollars. Production is limited to 1000 units and x is in hundreds of units. (a) Find the quantity that will give maximum profit. (b) ...
March 25, 2013

Calculus
The monthly demand function for a product sold by a monopoly is p = 3750 − 1/3x^2 dollars, and the average cost is C = 1000 + 70x + 3x^2 dollars. Production is limited to 1000 units and x is in hundreds of units. (a) Find the quantity that will give maximum profit. (b) ...
March 25, 2013

math
The monthly demand function for a product sold by a monopoly is p = 3750 − 1/3x^2 dollars, and the average cost is C = 1000 + 70x + 3x^2 dollars. Production is limited to 1000 units and x is in hundreds of units. (a) Find the quantity that will give maximum profit. (b) ...
March 24, 2013

science 207
chronic asthms when caused by air p[ollution is ,most likely due to: short term pollutant exposer long term pollutant exposer thbe weather during an episode of pollutant expossure exposure to a cerain kind of pollutant
March 24, 2013

science 297
chronic asthma when caused by air pollution is most likely due to
March 24, 2013

statistics
The grades on the final examination given in a large organic chemistry class are normally distributed with a mean of 72 and a standard deviation of 8. The instructor of this class wants to assign an “A” grade to the top 10% of the scores, a “B” grade to the...
March 24, 2013

Chemistry
What is the pH of a .0035 M Ba(OH)2 solution. I did -log(.0070) to find pOH So 14-2.15=11.85 pH? Just want to double check.
March 22, 2013

HELP PHYSICS!
Four charges with equal magnitudes of 7.81 × 10-12 C are placed at the corners of a rectangle. The lengths of the sides of the rectangles are 2.52 cm and 4.02 cm. Find the magnitude of the electric field at the center of the rectangle in Figures a and b. img166....
March 20, 2013

PHYSICS HELP!
The drawing shows a square, each side of which has a length of L = 0.25 m. Two different positive charges q1 and q2 are fixed at the corners of the square. Find the electric potential energy of a third charge q3 = -5 x 10-9 C placed at corner A and then at corner B. q1= 1.5e-9...
March 20, 2013

Physics
Four charges with equal magnitudes of 7.81 × 10-12 C are placed at the corners of a rectangle. The lengths of the sides of the rectangles are 2.52 cm and 4.02 cm. Find the magnitude of the electric field at the center of the rectangle in Figures a and b. img166....
March 20, 2013

Physics
The drawing shows a square, each side of which has a length of L = 0.25 m. Two different positive charges q1 and q2 are fixed at the corners of the square. Find the electric potential energy of a third charge q3 = -5 x 10-9 C placed at corner A and then at corner B. q1= 1.5e-9...
March 20, 2013

Ashford
This week you will analyze the computational complexity of the game you select. A good way to do this is to determine the steps of the game in the algorithm format from Week 4 and figure out how many steps it could take at maximum to finish the game. Include this analysis in ...
March 19, 2013

Ashford
Often, after graduation, students report that they can barely remember some of the concepts they studied in school. This is particularly true if a difficult concept is introduced. As asymptotic notation is perhaps one of the most difficult concepts to grasp and apply in this ...
March 19, 2013

Ashford
Often, after graduation, students report that they can barely remember some of the concepts they studied in school. This is particularly true if a difficult concept is introduced. As asymptotic notation is perhaps one of the most difficult concepts to grasp and apply in this ...
March 19, 2013

Physics
The process of inhalation in the lung may be modelled (very simplistically) by the pV diagram shown below , in which the pressure drops sharply in the lungs at constant volume, followed by expansion at constant pressure, and then finished by the pressure returning to ...
March 19, 2013

Physics
The process of inhalation in the lung may be modelled (very simplistically) by the pV diagram shown below , in which the pressure drops sharply in the lungs at constant volume, followed by expansion at constant pressure, and then finished by the pressure returning to ...
March 19, 2013

math
A box is lowered using a rope. If the acceleration of the box, is 2.5 m/s2 (downward) and the tension in the rope is 31 N, what is the mass of the box (in kg)?
March 18, 2013

physics
A thin spherical shell of mass M = 2.00 kg is released from rest at the top of an incline of height H=1.31 m and rolls without slipping to the bottom. The ramp is at an angle of θ = 24.1o to the horizontal. Calculate the speed of the sphere's CM at the bottom of the ...
March 18, 2013

Physics
What is the gibbs free energy for the reaction a)temperature b)800 degrees celsius c)comment on whether the reactions are spontaneous or not (CHEMICAL REACTION) deltaH = -100kJ delta S= -200 J/K
March 18, 2013

Math
5/4 + 7/4 x cos(2x)+ 3/4 x cos(4x)- 1/8 x cos(2x) x cos(4x)
March 17, 2013

Math
Rewrite in terms of an expression containing only cosines to the power 1. 4 cos^6x
March 17, 2013

physics
The engine on a 0.2kg model airplane exerts a forward force on the plane of 10N. If the plane accelerates at 2m/s2, what is the magnitude of the resistive force due to the wind acting on the airplane?
March 16, 2013

Calculus
I'm extremely confused on what to do in part a of this question. Consider the curve given by x=3sin(theta), y=1+2cos(theta), 0<=theta<=3pi/2 (a) Eliminate the parameter and find a Cartesian (Rectangular) equation for the curve.
March 13, 2013

pre calc
The front sprocket off a bicycle is 12 centimeters and the rear one is 5 centimeters. What is the linear velocity of the chain around the back sprocket? if the bicycle has tires that have a 38 centimeter diameter, how fast is the bicycle moving?
March 12, 2013

pre calc
The front sprocket off a bicycle is 12 centimeters and the rear one is 5 centimeters. What is the linear velocity of the chain around the back sprocket? if the bicycle has tires that have a 38 centimeter diameter, how fast is the bicycle moving?
March 12, 2013

precalc
The front sprocket off a bicycle is 12 centimeters and the rear one is 5 centimeters. What is the linear speed of the chain going around the first sprocket?
March 12, 2013

Math - Probabilities
There are a total of 116 foreign language students in a high school where they offer Spanish, French, and German. There are 22 students who take at least 2 languages at once. If there are 47 Spanish students, 45 French students, and 49 German students, how many students take ...
March 11, 2013

Math
Richard borrowed 180000 dollars from his bank to help finance the purchase of a house. The bank charges interest a rate of 5.9 percent per year compounded monthly. Richard has agreed to repay the loan in equal monthly installments over 25 years. How much should each payment be...
March 11, 2013

Math
I need help on the second part of the question :/
March 11, 2013

Math
Jim made a down payment of 1000 dollars toward the purchase of a car. To pay the balance of the purchase price, he has secured a loan from his bank at the nominal rate of 5.1 percent per year compounded monthly. Under the terms of his finance agreement, he is required to to ...
March 11, 2013

Stats
Directions: Suppose you have a standard deck 52 cards (4 suits: hearts, diamonds, clubs, and spades each suit has 13 cards (1/4 of the deck) and those 13 cards include one ace,and numbers 2 through 10 and 3 face cards: a jack a queen and king) suppose you pick a card at ...
March 10, 2013

MATH VERY URRRGENT!!!!!!!!!!!!!
1. What is the term for data that are grouped closely together? (1 point) Unselected answer (0 pts) outlier Unselected answer (0 pts) linear Unselected answer (0 pts) positive Correct answer (1 pt) clustering 1 /1 point 2. What association would you expect if graphing height ...
March 9, 2013

algebra
THE COMMUTER Sensible Sally has a job that is 35 miles from her home. She needs to be at work by 8:15 a.m. Sally wants to maximize her sleep time by leaving as late as possible but still get to work on time. From experimentations, Sally discovered that if she left at 7:10, it ...
March 7, 2013

Physicis
The gravitational force between two objects is 2,000N. They are moved so that the distance between them is four times the original distance. What is the new force between the objects?
March 7, 2013

Math(problem solving)
Four darts are thrown at this dartboard. If all four darts hit the board, how many different point totals are possible? there are 4 circles with point totals: working out from the middle bulls eye.. bulls eye = 9 2nd circle = 7 3rd circle = 4 outter circle = 1 please help, i&#...
March 6, 2013

probability
six out of every 400 cans of paint are found to be defective. If you buy four cans of paint,what is the probability that one can will be defective.
March 5, 2013

Math
In a set of 400 ACT scores where the mean is 22 and the standard deviation is 4.5, how many scores are expected to be lower than 26.5? How many of the 400 scores are expected to be greater than 31?
March 3, 2013

Algebra and Trigonometry
thats another question that i have
March 3, 2013

Algebra and Trigonometry
If an airplane wishes to fly north east at 300 mph has a wind blowing from 300 degrees at 60 mph, what heading and velocity must they have to accomplish this?
March 3, 2013

Algebra and Trigonometry
A person who can swim at 3 m/s wishes to swim straight across a river flowing at 2 m/s south. What heading should they swim at? How long will it take to cross the river if it is 56 m wide?
March 3, 2013

Algebra and Trigonometry
A plane if flying at 200 mph with a heading of 45 degrees and encounters a wind of 100 mph from the west. What is the resulting velocity and heading?
March 3, 2013

Trig
A plane if flying at 200 mph with a heading of 45 degrees and encounters a wind of 100 mph from the west. What is the resulting velocity and heading?
March 3, 2013

Life orientation
What can thembi do to deal with the unethical behaviour?name 4 action she can take. 3.3.3 How should discrimination in the work place be dealt with?
March 3, 2013

Life orientation
What,according to the basic conditions of employment act applies with regard to the contraventions that you've identified?
March 3, 2013

maths
heather loves roses.in her rose garden she has half as many pink roses as red,and four time as many red ones as white.there are 37 roses that are either yellow or white.twenty are yellow.how many roses are in heather's garden.
March 2, 2013

Physics
Student E used the most precise scale; this can be seen by the number of digits after the decimal.
March 2, 2013

biology
for a lab it says prepare a 300 ml of .2% sodium bicarbonate solution. I am trying to find how many grams of NaHCO3 i need. so i did 300ml X .002 and got .6ml of NaHCO3. but how do I convert that to grams of NaHCO3
March 2, 2013

calculus II
please for any help. I'm just really confused with this problem.
March 2, 2013

calculus II
∫ tan^2 x sec^3 x dx If the power of the secant n is odd, and the power of the tangent m is even, then the tangent is expressed as the secant using the identity 1 + tan^2 x = sec^2 x I thought that since tan is even and sec is odd, we have to put this in terms of cosine...
March 2, 2013

math
complete the pattern:1,2/3,4/9,4,4,4
March 1, 2013

math
in the number 0.123451234512345.........(recurring)what is the 1992th digit after the decimal point?
March 1, 2013

math
a taut wire of length 'W'emits a single note when plucked.if it were half as long it woould emit the same note but one octave higher.How long should the same wire be to emit the same note but one octave lower ?
March 1, 2013

math
in a set of number rods,there is one rod of length 10,2 rods of length 9,3 of length 8,and so on.If all these rods were laid end to end in one line,how long would the line be ?
March 1, 2013

math
is it day 20,or day 15
March 1, 2013

math
a gardener places lilies in a pond.He does on the first day of the month of september.it double in volume every day until the last day of the month,the pool is full.On what day of the month was the pool half full of lilies?
March 1, 2013

math
if X is 10% of two other numbers,Y and Z,and Z is 3 times the value of Y.What percentage is X of Y alone ? please show me how you work it out,thanks
March 1, 2013

BIOLOGY
The gastrointestinal phase of gastric secretion:? a. is controlled by the entrance of acidic chyme into the duodenum. b. leads to increased gastric secretion if duodenal pH falls below 2. c. only stimulates gastric secretion. d. will decrease gastric secretion when gastrin is ...
March 1, 2013

Spanish
Can someone please check if my answers are correct? combina las palabras lógicamente. 1. la langosta 2. la salchicha 3. el ají 4. el caldo 5. el sacacorchos 6. hornear 7. los ingredientes 8. la sal 9. el durazno 10. el aderezo a. el vino b. la toronja c. la sopa ...
February 28, 2013

chem
the units are the amount the ph changes
February 28, 2013

chem
By what factor does [H+] change for each pH change? (a) 3.60 units (b) 0.33 units how do you do this?
February 28, 2013

math
chickens have 2 feet. Rabbit have 4. They both each have 1 head. Let x be chickens and y be rabbits. 2(x + y = 18) 2x + 4y = 58 The subtract the equations from each other. 2x + 4y = 58 2x + 2y = 36 ------------- 2y = 22 y = 11 so x = 7
February 27, 2013

math
5 - y/2 = 3 -y/2 = -2 y/2 = 2 y = 4
February 27, 2013

analytic geometry helps are appreciated
So the "legs" of the triangle would be 2 I believe. And the area of a triangle is (Length*Width)/2. So I think the area should be 2units^2. I'm not sure if that's what you were asking.
February 27, 2013

TO MRS SUE
Aw ha I thought you might be able to help. I've been stuck on it for a while.
February 27, 2013

Algebra
For surface area, you find the area of each side (Length x Width) and then you add up all the sides.
February 27, 2013

Math
How many vertex's does a triangle have? That's your answer.
February 27, 2013

Chemistry
That makes so much more sense!! Thanks :)
February 27, 2013

Chemistry
Calculate the mass of baking soda, NaHCO3, needed to neutralize 3.0 mL of 3.0 M hydrochloric acid, HCl(aq). Ok, so I'm super confused. I have the equation, but I'm stuck with what to do with it. Equation: NaHCO3 + HCL --> NaCl + H2O + CO2
February 27, 2013

Math
You have 6 slices. 1/3 of the slices would be 2 slices.
February 27, 2013

SCIENTIFIC NOTATION (ALGEBRA
9.04 x 10^9
February 27, 2013

Algebra/Math
Ok, so you have x as the kg. The equation should look like this: .20(x) + .60(80-x) = .53(80) Then you can multiply everything out to solve for x.
February 27, 2013

English: Please help
Thank you very much. Will you answer 2 more for me? Thanks again
February 27, 2013

English: Please help
17. If you want to find the answer to a question about grammar, usage, or mechanics for your formal writing, which professional resource would not be helpful? A.) Essential Idioms in English B.) The Chicago Manual of Style C.) A Manual for Writers of Research Papers, Theses, ...
February 27, 2013

biology
thanks! so the heterozygous and homozygous dominant genotypes are p^2 and 2pq?
February 27, 2013

biology
how do i do this?
February 27, 2013

biology
The frequency of the sickle cell disease in parts of Central Africa is as high as 10 percent compared to a frequency of .5 percent in the US. Use the percentages for the Central Africa population and the US population to calculate the frequency of the heterozygous and ...
February 27, 2013

Math
Ok so we know this. Monday = x Tuesday = x +2 Wednesday = (1/2)x +11 They all add up to 53. The equation should look like this: (x) + (x + 2) + (1/2x + 11) = 53
February 27, 2013

college algebra
So first put y=2f(x+2)-3 into f(x) graphing form. And then flip the x and the y.
February 27, 2013

Algebra
The inverse function simply represents f(-x) and means that you have to flip the x and the y. If that makes sense.
February 27, 2013

Spanish: Please Help
Please help. Thank You Which is the best answer for this question? ¿Cuántos años tiene Jaime? A.) Tienes quince años. B.) Tengo quince años. C.) Tiene quince años. 22. Las Mañanitas is A.) a special cake eaten at birthday ...
February 27, 2013

Spanish: Please Help
Please help. Thank You. Which is the correct choice? ¿Cuál es la fecha de tu cumpleaños? A.) Es el uno de diciembre. B.) Es el primero de diciembre. C.) Es el primo de diciembre. D.) Es la primavera de diciembre. Which choice is correct? ¿Cuá...
February 27, 2013

algebra
You find a line with a slope that is the reciprocal of 2/3 so the line with a slope of -3/2.
February 27, 2013

Math
A wheel has a 32 inch diameter. The speed of a point on its rim is 44 ft/sec. What is its angular speed?
February 26, 2013

Math
A horse on a merry-go-round is 20 ft from the center and travels at 10 mph. What is its angular speed?
February 26, 2013

Chemistry
In determing the simplest formula of lead sulfide, 2.46 grams of of lead are placed in a crucible with 2.00 grams of sulfur. when the reaction is complete, the product has a mass of 3.22 grams. What mass of sulfur should be used in the simplest formula calculation? Find the ...
February 24, 2013

Physics/Biohemistry
If 1/C1+1/C2+1/C3=1/Ceq and Ceq=3.18 mF, then replace the given variables as such: 1/6.54+1/8.19+1/C:unknown=1/3.18 Now it becomes an algebra problem: Multiply both sides of the eqn by 3.18, then you'll have: 3.18/6.54 +3.18/8.18+3.18/Cunknown=1 Simplify: .49+.39+3.18/C=1 ...
February 24, 2013

AP Chemistry
A very old and tired , grey haired AP Chem instructor wanted to determine the Ka of an unlabelled monoprotic acid in his stockroom. He dissolved an unknown amount of acid in an unknown amount of water and proceeded to titrate the sample with a solution of NaOH of unknown ...
February 24, 2013

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