# Posts by Jamie

Total # Posts: 1,089

**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 ...

**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 ...

**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) ...

**Calculus**

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

**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?

**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.

**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...

**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...

**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...

**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 ...

**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 ...

**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 ...

**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.

**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?

**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?

**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 ...

**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 ...

**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??

**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 ...

**Science**

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

**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’...

**math**

6x6x3-6=108

**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?

**Math**

Use the order of operations to find the value of the expression. 6 x 5 + 3 x 8 Please help.

**Math**

I need to make a crossword puzzle using scientific notation and standard form

**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

**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

**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?

**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

**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 ...

**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...

**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 ...

**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.

**probability statistics**

how many bridge hands are possible containing 4 spaders, 6 diamonds , 1 club and 2 heart?

**none**

the length of a rectangle is 32 ft. the width is 18 ft. what is the diagonal length

**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.

**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

**Physics/Mechanics**

I've already calculated the distance, distance for 10 degrees is 17.28 and distance for 40 degrees is 4.68

**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...

**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 ...

**English**

Uplifting ?

**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

**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

**math**

okay thanks

**math**

3. 100% - 33% = 67% a = 0.67 * 134 = 89.78?

**math**

1. $78.20 2. ? 3. $200 4. $37.12

**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?

**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?

**life orientation**

ways on how the geographical distribution of media can be improved

**trigonometry**

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

**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.

**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 ...

**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?

**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 ...

**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...

**Bio**

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

**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...

**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 ...

**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 ?

**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.

**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 ...

**us history**

B? Because the declaration of sentiments was signed in 1848.

**Chemistry**

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

**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?

**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.

**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?

**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

**English & Composition**

Here is my topic sentence for ALLUSION

**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, ...

**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 (...

**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

**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

**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 +

**math**

1 + 1/7 = 7/7 + 1/7 = 8/7

**Math**

Convert the whole number into a fraction with the same denomenator

**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

**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 ...

**Math**

Answer is £12,000

**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...

**physics**

DAMON please help.Thankyou

**physicsTEST MONDAY**

Really confused!

**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 ...

**Inequalities - Algebra**

65458

**English**

I have a essay to write and I don't know what to write about. It is an analysis paper.

**English**

Has anyone read the book Into Thin Air? I need help with essay

**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?

**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

**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 ...

**Algebra**

Find the maximum revenue for the revenue function R(x) = 383x − 0.6x2.

**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.

**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.

**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.

**Composition**

Also is it surveillance (effects) or Affect? Always got those confused??

**Composition**

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

**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 ...

**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(...

**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?

**Physical Science**

Thanks guys

**Physical Science**

Explain how you can use Boyle's law to determine the new volume of a gas when it's pressure is increased from 270 kPa to 540 kPa? The original volume of gas was 1 l. Assume the temperature and number of particles are consistent. What is the new volume?

**Math**

-7/15+(-4/5)