Saturday
December 3, 2016

Posts by jamie

Total # Posts: 990

Physics
A pan flute is based on standing wave resonance in a tube that is open where the musician blows and closed at the bottom end with bee’s wax. (a) Describe the standing wave pattern of air displacement in such a tube when a tone is played. (b) Determine the length of the ...
December 3, 2016

Physics
Two kids sitting on opposite sides of a small lake use sticks to beat the surface of the water at a frequency f=1.5 Hz. They notice that a standing wave pattern develops between the points where they are disturbing the water surface. They count n=5 nodes over the L=10 m ...
December 3, 2016

Physics
The siren of an ambulance has a frequency f=500 Hz. A pedestrian standing on a sidewalk listens to this siren as the ambulance passes by at a speed of 65 mph. The speed of sound in air is 330 m/s. a) Calculate the total shift in frequency detected by the pedestrian as the ...
December 3, 2016

Physics
Poiseuille’s equation relates the volumetric flow rate Q (volume per time unit) to the pressure differential ?P that drives the flow: Q = (?r^4)/(8?) x (?P/L) Here ? is the viscosity of the fluid and the tube has length L and radius r. A fire brigade needs to triple its ...
December 3, 2016

Physics
Any help appreciated! Pull out a blank piece of paper from your exam book. Hold it from one of its ends and blow air horizontally over the top of the paper as shown in the figure below. If you blow hard enough you will see the paper rise to become almost horizontal. (a) ...
December 3, 2016

Calculus
Nevermind, I figured it out V=?[0,3]2pix(45-x^2-4x^2)dx
December 2, 2016

Calculus
Find the volume of the solid generated by revolving the region in the first quadrant that is above the parabola y= 4x^2 and below the parabola y= 45-x^2 about the y-axis I just need help setting up the integral. V=?[0,3]2pix(45-x^2)dx What am I doing wrong?
December 2, 2016

Calculus
Find the area of the region enclosed between y=4sin(x) and y=2cos(x) from x=0 to x=0.7pi. Hint: Notice that this region consists of two parts.
December 2, 2016

Physics
Please help! Any advice is appreciated A water faucet in a house is h=8 m below the water surface in the local water tower. The radius of the orifice in the fully opened faucet is r=0.01 m. We assume non-viscous flow in this problem. a) How long does it take to fill a 20 liter...
November 30, 2016

Physics- Fluids
Please help! Any advice is appreciated A water faucet in a house is h=8 m below the water surface in the local water tower. The radius of the orifice in the fully opened faucet is r=0.01 m. We assume non-viscous flow in this problem. a) How long does it take to fill a 20 liter...
November 30, 2016

Physics
Any help is appreciated! A grandfather clock is based on the period of oscillation of a pendulum. The clock keeps perfect time on the first floor of the Sears tower but when carefully moved to the top floor h=436 m above the surface of the earth, the clock is found to be slow...
November 30, 2016

Physics
Not sure where to go with this problem, any help is appreciated! A bike is turned upside down for repairs. The front wheel can be described as a hoop with radius R=0.6 m and mass M=1.0 kg and a small point mass m=0.005 kg attached to the perimeter to represent the valve for ...
November 29, 2016

Physics
Not sure where to go with this problem, any help is appreciated! A bike is turned upside down for repairs. The front wheel can be described as a hoop with radius R=0.6 m and mass M=1.0 kg and a small point mass m=0.005 kg attached to the perimeter to represent the valve for ...
November 29, 2016

Physics
Could someone please help walk me through this problem I'm struggling with? Thanks in advance! A brick with mass m1=2.5 kg can move without friction on a horizontal plane. The brick is attached to a wall by an ideal spring with spring constant k=2300 N/m. A second brick ...
November 29, 2016

Chemistry
What is the molarity of the final solution of 2.00mL of the 5.00M stock solution is diluted to 10.00mL to make solution A. Solution A undergoes a second dilution by taking 3.00mL solution A and diluting it to 25mL? I'm so confused by this. Please help.
November 10, 2016

geometry
I need help with my math.. Can someone please help.. In the coordinate plane point X lies on line segment MN. The coordinates for MN are (-1,3) and (7,10). If the ratio of the length of MX to the length of XN is 2:5, what is the y-coordinate of point X?
November 8, 2016

Calculus - Special sum formulas
Find the formula of n ? (j+3)(j-4) j=1 I have gotten to n(n+1)(2n+1)/6 - n(n+1)/2 - 12n How do I simplify it from there?
November 4, 2016

Calculus - Falling Body Problem
Near the surface of the earth, the acceleration of a falling body due to gravity is 32 feet per second per second, provided that air resistance is neglected. If an object is thrown upward from and initial height of 3000 feet with a velocity of 75 feet per second, find its ...
November 4, 2016

college chemistry
Stomach acid is composed primarily of HCl. If the concentration of the acid is 0.010M and it has a volume of 75 mL, how many generic tablets would you need to fully neutralize the acid? (Use your data) I just don't know where to start for this question, or the steps to ...
November 1, 2016

Chemistry
Wait, could you please explain a little more in depth please? I got lost after you started with the Extra Strength. The generic brand I'm using has 500 mg of active ingredient (CaCO3). Also, can you explain why you took half the number of moles of CaCO3??
November 1, 2016

Chemistry
Stomach acid is composed primarily of HCl. If the concentration of the acid is 0.010M and it has a volume of 70 mL, how many generic tablets would you need to fully neutralize the acid? (Use your data) I just don't know where to start for this question, or the steps to ...
November 1, 2016

Science
Yes, the answer is D (I just took this quiz and got it right).
October 31, 2016

English
"The Lottery" (1948) by Shirley Jackson ** this website won't allow for links; therefore, I couldn't put the link of this story** (the short story is online for reference) The question that needs to be answered is: EXPLAIN the source of horror in Jackson’...
October 20, 2016

math
6x6x3-6=108
October 14, 2016

Math - Calculus 1
Approximate the following value using derivatives (without a calculator) (1.1)^4 - (1.1)^2 I only know how to do linear approximation when using square roots. How do I do this type of problem?
October 7, 2016

Math
Use the order of operations to find the value of the expression. 6 x 5 + 3 x 8 Please help.
September 20, 2016

Math
I need to make a crossword puzzle using scientific notation and standard form
September 19, 2016

Trigonometry
How do I solve these linear system problems? I solved it many times but it never seems right. 1. x^2 + y^2 =9 2x - y = -6 2.x^2 - x -y =0 x - y = -3 3. 2x^2 - x - y = -1 3x + y = 5
September 17, 2016

geomety please help
the perimeter of a recatngle is 54 inches. The width is one inch less than the lenght. FInd the length and width. I just don't understand how to find the length and width if i am only givent eh perimeter please show work thank you
September 14, 2016

algebra
A store prices tapes by raising the wholesale price 40​% and adding 25 cents. What must a​ tape's wholesale price be if the tape sells for​ $1.99?
September 13, 2016

Algebra
For three consecutive odd​ integers, the sum of 3 times the first integer and 2 times the second integer is 11 less than 4 times the third integer. What are the three​ integers? Separate your answers with commas.​ Ex: 1,2,3
September 13, 2016

Biology
What is the sample size in this experiment? How can you tell what the sample size is in this case? A team of researchers observed that the acorn density of the oak forests in New York fluctuates from year to year and that mice populations in the forest were increased when the ...
August 30, 2016

Math - Check please!
I. -28/4 -7 *** 7 - 1/7 1/7 II. Which equation represents “fifteen more than r is sixty-one”? r + 61 = 15 r + 15 = 61 *** r – 15 = 61 r – 61 = 15 III. What is the value of 4^2 – 2(3 x 5 + 1)? 8 1 -16 *** -21 IV. What symbol is needed between -2 and |-3...
August 29, 2016

Chemistry
A salt water swimming pool is 47.0 m long, 25.1m wide, and 2.79 m deep. If the pool is filled with salt water having a density of 1.06 g/ cm3, how many pounds of salt water are in the pool when it is filled? 1 kg = 2.20 lb I'm not sure how to approach this. I've tried ...
August 29, 2016

Math
A square, where s is an odd integer, is divided into unit squares. All the unit squares along the edges and the 2 diagonals of a square are discarded. Find a fully simplified expression, in terms of s, for the number of unit squares remaining answer.
August 15, 2016

probability statistics
how many bridge hands are possible containing 4 spaders, 6 diamonds , 1 club and 2 heart?
August 13, 2016

none
the length of a rectangle is 32 ft. the width is 18 ft. what is the diagonal length
July 31, 2016

Math
A square, where s is an odd integer, is divided into unit squares. All the unit squares along the edges and the 2 diagonals of a square are discarded. Find a fully simplified expression, in terms of s, for the number of unit squares remaining answer.
July 5, 2016

Physics/Mechanics
the only thing i'm missing is the correct force used for both inclined planes as well as show my working out for getting the force
July 5, 2016

Physics/Mechanics
I've already calculated the distance, distance for 10 degrees is 17.28 and distance for 40 degrees is 4.68
July 5, 2016

Physics/Mechanics
Two part Question: A load of 1500N is to be at Height of 3m above the ground. The available Incline planes are 10 degrees and 40 Degrees to the horizontal. Find out the Work Done by effort on the 10 degrees and 40 Degrees ramps. Assume the coefficient of friction is 0.8. Which...
July 5, 2016

English
What principal idea about people does the story "Harrison Bergeron" convey? (Points : 5) Great art belongs to the few who can create it. Only a few people have the talent to become professional artists. The goal of equal rights for all should not erase the varying ...
June 1, 2016

English
Uplifting ?
June 1, 2016

English
The patriotism of the speaker in Rupert Brooke's "The Soldier" gives a poem about dying in battle a(n)__________ tone. Depressing ~~I feel it's this one Uplifting Angry Silly
June 1, 2016

English
Which phrase best describes the word choice & voice of "Theme for English B"? Dull & old-fashioned ~~I think it's this one Formal & fancy Wordy & vague Clear & candid
May 31, 2016

math
okay thanks
May 25, 2016

math
3. 100% - 33% = 67% a = 0.67 * 134 = 89.78?
May 25, 2016

math
1. $78.20 2. ? 3. $200 4. $37.12
May 25, 2016

math
1. Original price: $92 Discount: 15% What is the sale price? 2. Original price: $110 Sale price: $91.30 What is the discount? 3. Discount: 33% Sale price: $134.00 What is the original price? 4. Cost to store: $32 Markup: 16% What is the selling price?
May 25, 2016

Math
IT takes Holly 5 hours to type a paper. It takes Mike 6 hours to type the same paper. HOw long would it take them working together? Just average?
May 18, 2016

life orientation
ways on how the geographical distribution of media can be improved
May 18, 2016

trigonometry
given that θ=5/9 and pi/2<θ< pi, find the values of the other 5 trigonometric functions of θ
April 27, 2016

Math
Write a real world situation that can be represented by the expression 8(t - 3). Tell what the variable represents then give a value for t and evaluate the expression.
April 25, 2016

Statistics
I'm totally blanking on how to do this type of problem and I want to use the statistic for an essay. I want to say that females are ___% more likely to be cyberbullied than males. Here is the data I have... Females: 41% reported being bullied Males: 32% reported being ...
April 25, 2016

Math
Varlos found that 1/2 of the apples in one basket are Granny Smith apples and 1/6 of the apples in another basket are Granny Smith apples. Which statement correctly compared the feactions?
April 21, 2016

physics!
In its search for flying insects, a bat uses an echolocating system based on pulses of high frequency sound. These pulses are 2.0 ms in duration, have a frequency of 50 kHz, and an intensity level of 100 dB at 1.0 m from the bat’s mouth. Assume the bat produces acoustic ...
April 16, 2016

IMPORTIANT MATH
A school is fencing in a rectangular area for a playground. It plans to enclose the playground using fencing on three sides (the fourth is a wall) . The school has budgeted enough money for 75 ft of fencing material and would like to make a playground with an area of 600 ft^2...
April 12, 2016

Bio
What is being asked of me, the question reads: Extrapolate single trait genetic flow to human disorders and diseases.
April 7, 2016

Bio
How to I determine the sequence of amino acid assembled when given the following +DNA code: CCA, AGT ? I'm asked to give the :-DNA, mRNA, tRNA codes, and also the amino acid. If I'm not mistaken I know that I must replace "T" thymine for "U" uracil...
April 7, 2016

Bio
How does a change in one nucleotide in one triplet code can change the nature of a protein and therefore the form of the trait ? I believe this has something to do with mutations. I know that mutation may result from errors in DNA replication or recombination, or physical or ...
April 7, 2016

Bio.
How does the genetic code is transferred from the nucleus to the cytoplasm to the amino acids ? Does it have something to do with transferring DNA-RN A ?
April 7, 2016

chemistry
to complex ( K2[Cu(C2O4)2]H2O, add 1 com of dil. H2SO4. Add KI; then add 1-2cm3 choloform and shake gently. what are the observations.
April 3, 2016

HISTORY
Which answer best describes why women were active in early reform movements?   A. Many Americans believed women had higher morals than men. B. Many Americans believed women could better bring about change than men. C. Women in the 19th century had plenty of extra time to ...
March 29, 2016

us history
B? Because the declaration of sentiments was signed in 1848.
March 29, 2016

Chemistry
Calculate the empirical formula of Tylenol: C, 63.56%; H, 6.00%; N, 9.27%; O, 21.17%
March 26, 2016

Physics
If the sky diver releases her chute and an upward force of 800 Newtons is developed due to wind resistance, what will be the net force acting on her?
March 5, 2016

physics
A 5 kg block is being held against the wall. What is the minimum force needed to keep the block from moving if the force is applied at an angle that is 15 degrees above the horizontal. The coefficient of static friction between the wall and the block is 0.275.
February 29, 2016

URGENT NEED HELP ASAP
If you were a muckraker, would you want to expose, uncover, or examine the issue? Do you feel that issue still exists today, perhaps in a different form?
February 16, 2016

English
In "The Wager, by: Anton Chekhov" the climax comes when the jurist who is confined, begins to ask for musical instruments and tobacco. True or False
February 1, 2016

English & Composition
Here is my topic sentence for ALLUSION
January 23, 2016

English & Composition
Nevermind forget that. Those were just ideas to get me thinking but I just confused myself even more. So heres is the thesis : A. Thesis: To convince Virginia delegates to vote for revolution, Patrick Henry develops a passionate attitude through his rhetorical questions, ...
January 23, 2016

English & Composition
I need help with writing a topic sentence that briefly but accurately takes into context the quote below. This is a long quote so its difficult to make a topic sentence that deems appropriate in the sense of Allusion D. Topic Sentence Three (Allusion) : Primary Evidence (...
January 23, 2016

Chemistry
100 mL 0.1 M sodium acetate solution is mixed with 50 mL 0.1 M acetic acid. If now 0.937 mL of 1 M sodium hydroxide is added to the buffer what is the change in pH? pKa (acetic acid) = 4.76
January 9, 2016

Health
I believe number 4 is platelets not plasma
January 6, 2016

Physics
speed is a scalar and has no direction. Acceleration is a vector and direction matters so if an object is changing direction, it's acceleration changes independently of speed. So I would say yes it is possible for it to increase in speed as acceleration decreases
January 6, 2016

math
My guess is that when you say a mixed fraction e.g. 1 1/7, you literally say '1 and one seventh' so the & effectively means +
January 6, 2016

math
1 + 1/7 = 7/7 + 1/7 = 8/7
January 6, 2016

Math
Convert the whole number into a fraction with the same denomenator
January 6, 2016

ALGEBRA
Move every term with m in it onto one side, and the constants on the other. Divide the constant by the coefficient of m to get m. 9/2m - 4m = -3.5 + 6 2.5/0.5=5 M=5
January 6, 2016

Math
Right so 1/3 of his income goes on personal affairs leaving 2/3 left. He uses half of this (1/3) on household which leaves 1/3 left. He then invests 75% of the remaining 1/3 leaving 25% of that 1/3 in his hand. (1/3) x 0.25 = 0.083. So 8.33% of his initial salary equals the ...
January 6, 2016

Math
Answer is £12,000
January 6, 2016

Biology
The street lights in many cities contain bulbs with sodium vapor. When electrical energy is pass through the bulb, a brilliant yellow light is given off. What is happening to the sodium atoms to cause this? Explain. How would magnesium and chlorine interact? Please help. Thank...
January 5, 2016

physics
DAMON please help.Thankyou
December 20, 2015

physicsTEST MONDAY
Really confused!
December 20, 2015

physics
M1.) Nguyen jumps off a cliff with a height of 100 meters at a velocity of 3.5 meters per second to a save a cat. How long will it take her to reach the surface of the ocean? A3.) A plane vertically flees a horde of zombies at a speed of 7.9 m/s at a height of 230m above the ...
December 20, 2015

Inequalities - Algebra
65458
December 15, 2015

English
I have a essay to write and I don't know what to write about. It is an analysis paper.
December 5, 2015

English
Has anyone read the book Into Thin Air? I need help with essay
December 5, 2015

mathematics
Sorry Question a. Make a table of values and graph the function rule it it is the graph continuous or discrete explain. B. supposed the Coach spent $120 before tax.How many basketballs did he buy?
November 12, 2015

mathematics
The amount basketball coach spends at a sporting goods store depends on the number of basketball the coach buys.The situation is represented by the function rule a=15b
November 12, 2015

Composition
Sentence (1): Because of inspection devices, ordinary people lose their privacy. Although police say only criminals fear cameras, many people do not trust governments with too much information. Corrupt authorities may use and twist personal information in erroneous ways to ...
November 11, 2015

Algebra
Find the maximum revenue for the revenue function R(x) = 383x − 0.6x2.
November 11, 2015

Algebra
If the demand function for a commodity is given by the equation p2 + 16q = 1200 and the supply function is given by the equation 300 − p2 + 6q = 0, find the equilibrium quantity and equilibrium price.
November 11, 2015

Algebra
If a company has total costs C(x) = 20,000 + 25x + 0.2x2 and total revenues given by R(x) = 475x − 0.8x2, find the break-even points.
November 11, 2015

Composition
Is this OK? ... I just included affecting freedom of the individuals towards the bottom.. An observation system not only conflicts with civilization, but it profoundly impacts human daily activities affecting freedom of the individuals.
November 11, 2015

Composition
Also is it surveillance (effects) or Affect? Always got those confused??
November 11, 2015

Composition
Oops I realy didn't mean to put that hyphen but thanks for the point out! Thankyou both for your feedback (:
November 11, 2015

Composition
Can someone help me figure out a sentence from my conclusion CONNECTING BACK TO THE INTRO?? Or what can I say to connect back to my intro?? Thankyou to anyone who helps! (: My Intro: In the workplace, a new security installment begins in the workplace. Workers begin to feel ...
November 11, 2015

Algebra 2
Did I solve these problems correctly? 1. f(x)=-3x + 2 g(x)=3x^2 -x + 2 Find (f + g)(x) -3x+2+(3x^2-x+2) =3x^2-3x-x+4 =3x^2-4x-4 2. f(x)=x -1 g(x)=2x^2 -2x -5 Find g(f(x) ) 2x^2 -2x -5(x-1) =2x^2 -2x -5x+5 =2x^2 -7x+5 3. f(x)=3x + 2 g(x)= -2x2 -3x + 5 Find g(f(x) ) -2x^2-3x+5(...
November 10, 2015

Math
A box with a rectangular base and no top is to be made from a 9 inch by 12 inch piece of cardboard by cutting squares out of the corners and folding up the sides. What size (side-length) squares should be cut out to make the box have as much volume as possible?
October 29, 2015

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